Publications by authors named "Shoushuang Huang"

20 Publications

  • Page 1 of 1

Hierarchical CoFe LDH/MOF nanorods array with strong coupling effect grown on carbon cloth enables efficient oxidation of water and urea.

Nanotechnology 2021 Jul 2;32(38). Epub 2021 Jul 2.

School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, People's Republic of China.

Oxygen evolution reaction (OER) and urea oxidation reaction (UOR) play important roles in the fields of hydrogen energy production and pollution treatment. Herein, a facile one-step chemical etching strategy is provided for fabricating one-dimensional hierarchical nanorods array composed of CoFe layered double hydroxide (LDH)/metal-organic frameworks (MOFs) supported on carbon cloth as efficient and stable OER and UOR catalysts. By precisely controlling the etching rate, the ligands from Co-MOFs are partially removed, the corresponding metal centers then coordinate with hydroxyl ions to generate ultrathin amorphous CoFe LDH nanosheets. The resultant CoFe LDH/MOFs catalyst possesses large active surface area, enhanced conductivity and extended electron/mass transfer channels, which are beneficial for catalytic reactions. Additionally, the intimate contact between CoFe LDH and MOFs modulates the local electronic structure of the catalytic active site, leading to enhanced adsorption of oxygen-containing intermediates to facilitate fast electrocatalytic reaction. As a result, the optimized CoFe LDH/MOF-0.06 exhibits superior OER activity with a low overpotential of 276 at a current density of 10 mA cmwith long-term durability. Additionally, it merely requires a voltage of 1.45 V to obtain 10 mA cmin 1 M KOH solution with 0.33 urea and is 56 mV lower than the one in pure KOH. The work presented here may hew out a brand-new route to construct multi-functional electrocatalysts for water splitting, COreduction, nitrogen reduction reactions and so on.
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http://dx.doi.org/10.1088/1361-6528/ac0b65DOI Listing
July 2021

Integrated Design of Hierarchical [email protected]@[email protected] Nanobox as Anode Material for Enhanced Lithium Storage Performance.

ACS Appl Mater Interfaces 2020 Apr 17;12(17):19768-19777. Epub 2020 Apr 17.

Shanghai Applied Radiation Institute, School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China.

Transition-metal oxides (TMOs) are potential candidates for anode materials of lithium-ion batteries (LIBs) due to their high theoretical capacity (∼1000 mA h/g) and enhanced safety from suppressing the formation of lithium dendrites. However, the poor electron conductivity and the large volume expansion during lithiation/delithiation processes are still the main hurdles for the practical usage of TMOs as anode materials. In this work, the [email protected]@[email protected] hierarchical nanobox (CNMN) is then proposed and fabricated to solve those issues. The as-prepared nanobox contains hollow cubic CoSnO as a core and dual N-doped carbon-"sandwiched" MnO particles as a shell. As anode materials of LIBs, the hollow and carbon interlayer structures effectively accommodate the volume expansion while dual active TMOs of CoSnO and MnO efficiently increase the specific capacity. Notably, the dual-layer structure of N-doped carbons plays a critical functional role in the incorporated composites, where the inner layer serves as a reaction substrate and a spatial barrier and the outer layer offers electron conductivity, enabling more effective involvement of active anode materials in lithium storage, as well as maintaining their high activity during lithium cycling. Subsequently, the as-prepared CNMN exhibits a high specific capacity of 1195 mA h/g after the 200th cycle at 0.1C and an excellent stable reversible capacity of about 876 mA h/g after the 300th cycle at 0.5C with only 0.07 mA h/g fade per cycle after 300 cycles. Even after a 250 times fast charging/discharging cycle both at 5C, it still retains a reversible capacity of 422.6 mA h/g. We ascribe the enhanced lithium storage performances to the novel hierarchical architectures achieved from the rational design.
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http://dx.doi.org/10.1021/acsami.9b22368DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7304665PMC
April 2020

Structural phase transformation from SnS/reduced graphene oxide to SnS/sulfur-doped graphene and its lithium storage properties.

Nanoscale 2020 Jan;12(3):1697-1706

School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, China.

In this work, we demonstrate an interesting structural phase transition from SnS2/reduced graphene oxide to SnS/sulfur-doped graphene at a moderate calcination temperature of 500 °C under an inert atmosphere. It is discovered that SnS2 chemically bound to rGO with a weakened C-S bond is easier to break and decompose into SnS, whereas it is difficult for pure-phase crystalline SnS2 to experience phase transformation at this temperature. Moreover, the thin-layered structure of SnS2 and rGO is an important factor for the effective doping of the dissociated Sx into graphene. Density functional theory calculations also reveal the feasibility of the structural phase transition process. Morphology characterization shows that partial SnS maintains the original nanosheet structure (∼100 nm) and the others are decomposed into tiny nanoparticles (10-20 nm). A high S-doping amount reduces the irreversible lithium storage sites on graphene, and the first coulombic efficiency is as high as 81.7%. In addition, thin-layered and small-sized SnS can alleviate the structural damage caused by volume expansion and shrinkage; therefore, a high specific capacity of 893.9 mA h g-1 is retained after 100 cycles.
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http://dx.doi.org/10.1039/c9nr08075aDOI Listing
January 2020

Well-defined [email protected] hollow heterostructured nanocubes with enhanced dissociation kinetics for overall water splitting.

Nanoscale 2020 Jan 11;12(1):326-335. Epub 2019 Dec 11.

Shanghai Electrochemical Energy Devices Research Center, School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, China.

Hollow heterostructures have tremendous advantages in electrochemical energy storage and conversion areas due to their unique structure and composition characteristics. Here, we report the controlled synthesis of hollow CoSe nanocubes decorated with ultrathin MoSe nanosheets ([email protected]) as an efficient and robust bifunctional electrocatalyst for overall water splitting in a wide pH range. It is found that integrating ultrathin MoS nanosheets with hollow CoSe nanocubes can provide abundant active sites, promote electron/mass transfer and bubble release and facilitate the migration of charge carriers. Additionally, the surface electron coupling in the heterostructures enables it to serve as a source of sites for H and/or OH adsorption, thus reducing the activation barrier for water molecules adsorption and dissociation. As a result, the title compound, [email protected] hollow heterostructures, exhibits an overpotential of 183 mV and 309 mV at a current density of 10 mA cm toward hydrogen evolution reactions and oxygen evolution reactions in 1.0 M KOH, respectively. When applied as both cathode and anode for overall water splitting, a low battery voltage of 1.524 V is achieved along with excellent stability for at least 12 h. This work provides a new idea for the design and synthesis of high-performance catalysts for electrochemical energy storage and conversion.
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http://dx.doi.org/10.1039/c9nr08751fDOI Listing
January 2020

Sandwich-like SnS/Graphene/SnS with Expanded Interlayer Distance as High-Rate Lithium/Sodium-Ion Battery Anode Materials.

ACS Nano 2019 Aug 24;13(8):9100-9111. Epub 2019 Jul 24.

Institute for Sustainable Energy , Shanghai University , Shanghai 200444 , China.

SnS materials have attracted broad attention in the field of electrochemical energy storage due to their layered structure with high specific capacity. However, the easy restacking property during charge/discharge cycling leads to electrode structure instability and a severe capacity decrease. In this paper, we report a simple one-step hydrothermal synthesis of SnS/graphene/SnS (SnS/rGO/SnS) composite with ultrathin SnS nanosheets covalently decorated on both sides of reduced graphene oxide sheets C-S bonds. Owing to the graphene sandwiched between two SnS sheets, the composite presents an enlarged interlayer spacing of ∼8.03 Å for SnS, which could facilitate the insertion/extraction of Li/Na ions with rapid transport kinetics as well as inhibit the restacking of SnS nanosheets during the charge/discharge cycling. The density functional theory calculation reveals the most stable state of the moderate interlayer spacing for the sandwich-like composite. The diffusion coefficients of Li/Na ions from both molecular simulation and experimental observation also demonstrate that this state is the most suitable for fast ion transport. In addition, numerous ultratiny SnS nanoparticles anchored on the graphene sheets can generate dominant pseudocapacitive contribution to the composite especially at large current density, guaranteeing its excellent high-rate performance with 844 and 765 mAh g for Li/Na-ion batteries even at 10 A g. No distinct morphology changes occur after 200 cycles, and the SnS nanoparticles still recover to a pristine phase without distinct agglomeration, demonstrating that this composite with high-rate capabilities and excellent cycle stability are promising candidates for lithium/sodium storage.
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http://dx.doi.org/10.1021/acsnano.9b03330DOI Listing
August 2019

Porous ZnO/CoO/N-doped carbon nanocages synthesized via pyrolysis of complex metal-organic framework (MOF) hybrids as an advanced lithium-ion battery anode.

Acta Crystallogr C Struct Chem 2019 Jul 18;75(Pt 7):969-978. Epub 2019 Jun 18.

School of Environmental and Chemical Engineering, Shanghai University, Shangda Road 99, Shanghai 200444, People's Republic of China.

Metal oxides have a large storage capacity when employed as anode materials for lithium-ion batteries (LIBs). However, they often suffer from poor capacity retention due to their low electrical conductivity and huge volume variation during the charge-discharge process. To overcome these limitations, fabrication of metal oxides/carbon hybrids with hollow structures can be expected to further improve their electrochemical properties. Herein, ZnO-CoO nanocomposites embedded in N-doped carbon ([email protected]) nanocages with hollow dodecahedral shapes have been prepared successfully by the simple carbonizing and oxidizing of metal-organic frameworks (MOFs). Benefiting from the advantages of the structural features, i.e. the conductive N-doped carbon coating, the porous structure of the nanocages and the synergistic effects of different components, the as-prepared [email protected] not only avoids particle aggregation and nanostructure cracking but also facilitates the transport of ions and electrons. As a result, the resultant [email protected] shows a discharge capacity of 2373 mAh g at the first cycle and exhibits a retention capacity of 1305 mAh g even after 300 cycles at 0.1 A g. In addition, a reversible capacity of 948 mAh g is obtained at a current density of 2 A g, which delivers an excellent high-rate cycle ability.
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http://dx.doi.org/10.1107/S2053229619008222DOI Listing
July 2019

Construction of SnS-SnO heterojunctions decorated on graphene nanosheets with enhanced visible-light photocatalytic performance.

Acta Crystallogr C Struct Chem 2019 Jun 29;75(Pt 6):812-821. Epub 2019 May 29.

School of Environmental and Chemical Engineering, Shanghai University, ShangDa Road 99, Shanghai 200444, People's Republic of China.

Heterostructures formed by the growth of one kind of nanomaterial in/on another have attracted increasing attention due to their microstructural characteristics and potential applications. In this work, SnS-SnO heterostructures were successfully prepared by a facile hydrothermal method. Due to the enhanced visible-light absorption and efficient separation of photo-generated holes and electrons, the SnS-SnO heterostructures display excellent photocatalytic performance for the degradation of rhodamine (RhB) under visible-light irradiation. Additionally, it is found that the introduction of graphene into the heterostructures further improved photocatalytic activity and stability. In particular, the optimized SnS-SnO/graphene photocatalyst can degrade 97.1% of RhB within 60 min, which is about 1.38 times greater than that of SnS-SnO heterostructures. This enhanced photocatalytic activity could be attributed to the high surface area and the excellent electron accepting and transporting properties of graphene, which served as an acceptor of the generated electrons to suppress charge recombination. These results provide a new insight for the design and development of hybrid photocatalysts.
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http://dx.doi.org/10.1107/S2053229619006399DOI Listing
June 2019

Environmentally benign synthesis of CoO-SnO heteronanorods with efficient photocatalytic performance activated by visible light.

J Colloid Interface Sci 2019 Apr 22;542:460-468. Epub 2019 Jan 22.

School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, People's Republic of China. Electronic address:

One-dimensional (1D) heterostructured photocatalysts with controllable texture properties and compositions have attracted increasing interest owing to their unique optical, structural, and electronic advantages. Herein, 1D CoO-SnO heteronanorods were rationally designed and synthesized through a facile solution-based approach. Benefiting from both of their heterostructural and compositional characteristics, the resulting CoO-SnO heteronanorods exhibit high photocatalytic performance for the degradation of Rhodamine B (RhB) under visible-light irridation. In particular, the photocatalyst with a CoO/SnO mass ratio of 1:1 provides the best photocatalytic performance, which can degrade 90% RhB within 120 min. Besides, several reaction parameters affecting RhB degradation, such as churning time, calcination temperature and pH value, are investigated in detail. The enhanced photocatalytic activity can be attributed to the broadening of absorption spectrum to visible-light regions and the efficient charge separation of photogenerated electron-hole pairs due to the formed p-n heterojunctions. The strategy reported here can be able to expand to fabricate other heterostructured photocatalysts for practical applications in the fields of photocatalysis, water splitting, and solar cells.
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http://dx.doi.org/10.1016/j.jcis.2019.01.089DOI Listing
April 2019

Construction of Ni-doped SnO-SnS heterojunctions with synergistic effect for enhanced photodegradation activity.

J Hazard Mater 2019 Apr 7;368:204-213. Epub 2019 Jan 7.

School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, People's Republic of China. Electronic address:

Construction of heterostructures with proper band alignment and effective transport and separation of photogenerated charges is highly expected for photocatalysis. In this work, Ni-doped SnO-SnS heterostructures (NiSnSO) are simply prepared by thermal oxidation of Ni-doped hierarchical SnS microspheres in the air. When applied for the photodegradation of organic contaminants, these NiSnSO exhibit excellent catalytic performance and stability due to the following advantages: (1) Ni doping leads to the enhancement of light harvesting of SnS in the visible light regions; (2) the formed heterojunctions promote the transport and separation of photogenerated electrons from SnS to SnO; (3) Ni-SnO quantum dots facilitate the enrichment of reactants, provide more reactive centers and accelerate product diffusion in the reactive centers; (4) the SnS hierarchical microspheres constituted by nanoplates provide abundant active sites, high structural void porosity and accessible inner surface to faciliate the catalytic reactions. As a result, the optimized NiSnSO can photodegrade 92.7% methyl orange within 80 min under the irradiation of simulated sunlight, greatly higher than those of pure SnS (29.8%) and Ni-doped SnS (52.1%). These results reveal that the combination of heteroatom doping and heterostructure fabrication is a very promising strategy to deliver nanomaterials for effectively photocatalytic applications.
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http://dx.doi.org/10.1016/j.jhazmat.2019.01.009DOI Listing
April 2019

Sandwiched spherical tin dioxide/graphene with a three-dimensional interconnected closed pore structure for lithium storage.

Nanoscale 2018 Aug;10(34):16116-16126

School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, China.

Low reversion of lithium oxide (Li2O) and the tin (Sn) coarsening causing irreversible capacity loss is the main reason for the poor cycle performance in tin dioxide (SnO2) based composites. In this research, a novel sandwiched spherical tin dioxide/graphene with a three-dimensional interconnected closed pore structure is synthesized. The microstructural characterization shows that the spherical graphene with submicron sized diameters interconnects with each other forming an interconnected flexible conductive network, whereas a large number of SnO2 nanoparticles (approximately 5 nm) are limited homogeneously in between the interlayers of the sphere-like graphene shell. The sandwich structure of the SnO2/graphene and the closed graphene sphere can provide double protection for the SnO2. When it is used as an anode material for energy storage, the generated Li2O can remain in close contact with Sn to make the conversion reaction (SnO2 + 4Li+ + 2e- ↔ Sn + Li2O) highly reversible in situ and the reversibility even does not diminish markedly after 100 cycles. A high reversible specific capacity of 914.8 mA h g-1 is expressed in the sandwiched spherical SnO2/graphene composite at 100 mA g-1 after 100 cycles, which is significantly higher than that of a SnO2/graphene aerogel with an open pore structure.
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http://dx.doi.org/10.1039/c8nr03776kDOI Listing
August 2018

Encapsulating CoS-CoSe heterostructured nanocrystals in N-doped carbon nanocubes as highly efficient counter electrodes for dye-sensitized solar cells.

Dalton Trans 2018 Apr;47(15):5236-5244

School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China.

Designing low-cost electrocatalysts combining the features of outstanding catalytic activity, excellent electrical conductivity, and high chemical stability remains a critical challenge for the large-scale fabrication of dye-sensitized solar cells (DSSCs). Here we report the controlled synthesis of CoS2-CoSe2 heterostructured nanocrystals encapsulated in N-doped carbon hollow nanocubes ([email protected]) through simultaneous sulfurization and selenization of polydopamine coated Prussian blue analogs. Benefiting from both structural and compositional characteristics, namely, the synergistic effect of CoS2-CoSe2 heterojunctions, the conductive N-doped carbon coating and the porous structure of the nanocubes, the resultant [email protected] nanocubes exhibit excellent electrocatalytic activity and cycling stability toward the generation of I3- ions in DSSCs. A typical device achieves a high power conversion efficiency (PCE) of 8.45% under AM1.5G illumination (100 mW cm-2), superior to that of a standard Pt-based device (8.07%). These results demonstrate that the as-synthesized [email protected] nanocubes are promising alternatives to Pt in DSSCs. The work represented here not only provides a promising strategy to design efficient and robust CE catalysts, but also can be extended for synthesizing other novel metal sulfide/selenide hybrid materials for applications in the fields of energy conversion and storage.
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http://dx.doi.org/10.1039/c8dt00067kDOI Listing
April 2018

Lithiation-assisted exfoliation and reduction of SnS to SnS decorated on lithium-integrated graphene for efficient energy storage.

Nanoscale 2017 Nov;9(45):17922-17932

School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, China.

Low reversion of lithium sulfide and defects causing irreversible capacity loss are the primary causes of low Coulombic efficiency in tin sulfide/graphene-based composites. Herein, we synthesized a SnS/graphene composite via a novel lithiation-assisted exfoliation and reduction method using SnS, n-butyllithium, and graphene oxide as raw materials. The experimental results reveal that lithium from the insertion agent combine with the oxygen-containing groups on graphene oxide; this can help in the reduction of hexagonal SnS to orthorhombic SnS during calcination and simultaneous pre-occupancy of the edge and defect sites of graphene; thus, additional lithium ion consumption during the initial several lithiation processes is diminished. Microstructural characterizations indicate that the exfoliated SnS nanosheets with a dramatically decreased lateral size (50-100 nm) are uniformly decorated on the surface of lithium-integrated graphene sheets. Consequently, the as-prepared SnS/graphene composite exhibits a significantly high SnS ultilization with a 77.5% initial Coulombic efficiency, which is the highest value reported in the current literature. Moreover, an excellent reversibility of conversion reaction (SnS + 2Li + 2e ↔ Sn + LiS) and a high reversible capacity of 1016.4 mA h g after 100 cycles are expressed in this composite electrode, demonstrating its importance as an anode material for energy storage.
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http://dx.doi.org/10.1039/c7nr06798dDOI Listing
November 2017

Synergistically Enhanced Electrochemical Performance of NiS-PtX (X = Fe, Ni) Heteronanorods as Heterogeneous Catalysts in Dye-Sensitized Solar Cells.

ACS Appl Mater Interfaces 2017 Aug 11;9(33):27607-27617. Epub 2017 Aug 11.

Shanghai Electrochemical Energy Devices Research Center, School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University , Shanghai 200240, China.

Platinum (Pt)-based alloys are considerably promising electrocatalysts for the reduction of I/I and Co/Co redox couples in dye-sensitized solar cells (DSSCs). However, it is still challenging to minimize the dosage of Pt to achieve comparable or even higher catalytic efficiency. Here, by taking full advantages of the Mott-Schottky (M-S) effect at the metal-semiconductor interface, we successfully strategize a low-Pt-based M-S catalyst with enhanced electrocatalytic performance and stability for the large-scale application of DSSCs. The optimized M-S electrocatalyst of NiS-PtX (X = Fe, Ni) heteronanorods is constructed by rationally controlling the ratio of Pt to transition metal in the hybrids. It was found that the electrons transferred from NiS to PtX at their interface under the Mott-Schottky effect result in the concentration of electrons onto PtX domains, which subsequently accelerates the regeneration of both I/I and Co/Co redox shuttles in DSSCs. As a result, the DSSC with NiS-PtFe manifests an impressive power conversion efficiency (PCE) of 8.79% and 5.56% for iodine and cobalt-based electrolyte under AM1.5G illumination, respectively. These PCEs are obviously superior over those with NiS-Pt, PtFe, NiS, and pristine Pt electrodes. The strategy reported here is able to be further expanded to fabricate other low-Pt-alloyed M-S catalysts for wider applications in the fields of photocatalysis, water splitting, and heterojunction solar cells.
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http://dx.doi.org/10.1021/acsami.7b05418DOI Listing
August 2017

Colloidal synthesis of wurtz-stannite Cu2CdGeS4 nanocrystals with high catalytic activity toward iodine redox couples in dye-sensitized solar cells.

Chem Commun (Camb) 2016 Sep 15;52(72):10866-9. Epub 2016 Aug 15.

Shanghai Electrochemical Energy Devices Research Center, School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China.

Wurtz-stannite Cu2CdGeS4 nanocrystals were synthesized via a facile hot-injection method at a low temperature. They exhibited low charge transfer resistance at the electrolyte-electrode interface and high electrocatalytic activity for the reduction of I3(-) in dye-sensitized solar cells (DSSCs). Moreover, this DSSC showed a power conversion efficiency of 7.67%, comparable to the Pt-based device (7.54%).
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http://dx.doi.org/10.1039/c6cc05163dDOI Listing
September 2016

Efficient Counter Electrode Manufactured from Ag2 S Nanocrystal Ink for Dye-Sensitized Solar Cells.

Chemistry 2015 Oct 4;21(43):15153-7. Epub 2015 Sep 4.

Shanghai Electrochemical Energy Devices Research Center, School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240 (P. R. China).

It is generally believed that silver or silver-based compounds are not suitable counter electrode (CE) materials for dye-sensitized solar cells (DSSCs) due to the corrosion of the I(-) /I3 (-) redox couple in electrolytes. However, Ag2 S has potential applications in DSSCs for catalyzing I3 (-) reduction reactions because of its high carrier concentration and tiny solubility product constant. In the present work, CE manufactured from Ag2 S nanocrystals ink exhibited efficient electrocatalytic activity in the reduction of I3 (-) to I(-) in DSSCs. The DSSC consisting of Ag2 S CE displayed a higher power conversion efficiency of 8.40 % than that of Pt CE (8.11 %). Moreover, the devices also showed the characteristics of fast activity onset, high multiple start/stop capability and good irradiated stability. The simple composition, easy preparation, stable chemical property, and good catalytic performance make the developed Ag2 S CE as a promising alternative to Pt CE in DSSCs.
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http://dx.doi.org/10.1002/chem.201502337DOI Listing
October 2015

The role of Mott-Schottky heterojunctions in PtCo-Cu2ZnGeS4 as counter electrodes in dye-sensitized solar cells.

Chem Commun (Camb) 2015 May;51(43):8950-3

Shanghai Electrochemical Energy Devices Research Center, School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China.

Metastable wurtzstannite Cu2ZnGeS4 (CZGS) nanocrystals were synthesized via a hot-injection method and then used as matrixes to fabricate PtCo-CZGS heterostructured nano-particles. The formed Mott-Schottky heterojunctions in the hybrid nanocrystals promote the transfer of electrons from semiconducting CZGS to metallic PtCo, which accelerates the reduction of I3(-) to I(-) in dye-sensitized solar cells.
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http://dx.doi.org/10.1039/c5cc02584bDOI Listing
May 2015

Ultrathin FeSe2 nanosheets: controlled synthesis and application as a heterogeneous catalyst in dye-sensitized solar cells.

Chemistry 2015 Mar 29;21(10):4085-91. Epub 2015 Jan 29.

Shanghai Electrochemical Energy Devices Research Center, School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240 (P. R. China).

Two-dimensional (2D) semiconducting nanosheets have emerged as an important field of materials, owing to their unique properties and potential applications in areas ranging from electronics to catalysis. However, the controlled synthesis of ultrathin 2D nanosheets remains a great challenge, due to the lack of an intrinsic driving force for anisotropic growth. High-quality ultrathin 2D FeSe2 nanosheets with average thickness below 7 nm have been synthesized on large scale by a facile solution method, and a formation mechanism has been proposed. Due to their favorable structural features, the as-synthesized ultrathin FeSe2 nanosheets exhibit excellent electrocatalytic activity for the reduction of triiodide to iodide and low charge-transfer resistance at the electrolyte-electrode interface in dye-sensitized solar cells (DSSCs). The DSSCs with FeSe2 nanosheets as counter electrode material achieve a high power conversion efficiency of 7.53% under a simulated solar illumination of 100 mW cm(-2) (AM 1.5), which is comparable with that of Pt-based devices (7.47%).
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http://dx.doi.org/10.1002/chem.201406124DOI Listing
March 2015

The role of Mott-Schottky heterojunctions in Ag-Ag8SnS6 as counter electrodes in dye-sensitized solar cells.

ChemSusChem 2015 Mar 23;8(5):817-20. Epub 2015 Jan 23.

School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240 (PR China).

Well-defined uniform pyramidal Ag-Ag8SnS6 heterodimers are prepared via a one-pot method. A plausible formation mechanism for the unique structures based on a seed-growth process and an etching effect due to oleylamine is proposed. The formed metal-semiconductor Mott-Schottky heterojunction promotes electron transfer from semiconducting Ag8 SnS6 to metallic Ag, which catalyzes the reduction of I3 (-) to I(-). When used as counter electrode in dye-sensitized solar cells, the heterodimers show comparable performance to platinum.
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http://dx.doi.org/10.1002/cssc.201403343DOI Listing
March 2015

Highly efficient Ag₂O/Bi₂O₂CO₃ p-n heterojunction photocatalysts with improved visible-light responsive activity.

ACS Appl Mater Interfaces 2014 Jul 8;6(14):11698-705. Epub 2014 Jul 8.

School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University , Shanghai 200240, P. R. China.

Ag2O/Bi2O2CO3 p-n heterojunctions are prepared with commercial Bi2O2CO3 as precursor via a simple photosynthesis process. The obtained Ag2O/Bi2O2CO3 p-n heterojunctions show higher photocatalytic activity than that of pure n-Bi2O2CO3, and the obtained Ag2O/Bi2O2CO3 (AB-4) heterojunction exhibits the best photocatalytic activity under visible light (λ > 400 nm), with which Rhodamine B, methyl blue and methyl orange can be completely degraded within 12 min. Photoluminescent spectra and photoelectrochemical measurement further indicate that the Ag2O/Bi2O2CO3 p-n heterojunctions greatly enhance the charge generation and suppress the charge recombination of photogenerated electron-hole pairs, which would be beneficial to improve their photocatalytic activity.
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http://dx.doi.org/10.1021/am502481zDOI Listing
July 2014

Chemical synthesis, structure characterization, and optical properties of hollow PbS(x)-solid Au heterodimer nanostructures.

Chemistry 2010 May;16(20):5920-6

School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China.

Heterodimer nanostructures have attracted extensive attention, owing to an increasing degree of complexity, functionality, and then importance. So far, all the reported ones are built from solid nanoparticles. Herein, nearly monodisperse heterodimer nanostructures are constructed by hollow PbS(x) and solid Au domains simultaneously through a mild reaction between PbS nanocrystals and the gold species in the presence of dodecylamine. Control experiments clearly reveal the underlying formation mechanism of the hollow PbS(x)-solid Au heterodimers. The Au(III) species in the solution, lead to the etching of PbS nanocrystals and the Au(I) species facilitate the control of the number of gold domains per nanoparticle. Dodecylamine molecules not only work as a stabilizer in the reaction, but also act as a reducing agent that could greatly affect the morphology of the product. The optical properties of the heterodimers are investigated based on UV/Vis absorption spectroscopy and Raman spectroscopy. This novel heterodimer nanostructure pushes the development of complex nanocrystal-based architectures forward, and also provides many opportunities for potential applications.
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http://dx.doi.org/10.1002/chem.200902826DOI Listing
May 2010
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