Publications by authors named "Tushar Kanta Sahu"

4 Publications

  • Page 1 of 1

Phosphorus nitride nano-dots as a versatile and metal-free support for efficient photoelectrochemical water oxidation.

Chem Commun (Camb) 2021 Jun;57(50):6157-6160

Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India.

Phosphorus nitride dots (PNDs) are employed as a metal-free and versatile support over a range of metal oxide-based photoanodes for efficient photoelectrochemical (PEC) water oxidation. PNDs have the ability to form various heterojunctions by virtue of their favorable band positions for enhanced charge separation leading to improved photocurrent densities.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1039/d1cc01030aDOI Listing
June 2021

Tuning the Electronic Structure of Monoclinic Tungsten Oxide Nanoblocks by Indium Doping for Boosted Photoelectrochemical Performance.

Chem Asian J 2020 Nov 19;15(22):3886-3896. Epub 2020 Oct 19.

Department of Chemistry, Indian Institute of Technology Guwahati, Assam, 781039, India.

Photoelectrochemical (PEC) water oxidation, a desirable strategy to meet future energy demands, has several bottle-necks to resolve. One of the prominent issues is the availability of charge carriers at the surface reaction site to promote water oxidation. Of the several approaches, metal dopants to enhance the carrier density of the semiconductors, is an important one. In this work, we have studied the effect of In-doping on monoclinic WO nanoblocks, growing vertically over fluorine-doped tin oxide (FTO) without the aid of any seed layer. X-ray photoelectron spectroscopy (XPS) data reveals that In ions are partially occupying the W ions in In-doped WO photoanode. In ions are offering better performance by adding additional charge carriers for amplifying the expression of the number of carriers. The maximum current density value of 2.18 mA/cm has been provided by the optimized In-doped WO photoanode with 3 wt% indium doping at 1.23 V vs. RHE, which is ∼3 times higher than that of undoped monoclinic WO photoanode. Mott-Schottky (MS) analysis reveals charge carrier density (N ) for In-doped WO photoanode has been enhanced by a factor of 3. An average Faradic yield of ∼90 percent has been achieved which can serve as a model system using In as a dopant for an inexpensive and attractive method for enhanced WO based PEC water oxidation.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1002/asia.202000787DOI Listing
November 2020

Effect of surface overlayer in enhancing the photoelectrochemical water oxidation of in situ grown one-dimensional spinel zinc ferrite nanorods directly onto the substrate.

Chem Commun (Camb) 2018 Sep;54(74):10483-10486

Department of Chemistry, Indian Institute Technology, Guwahati - 781039, Assam, India.

Overlayer passivation minimizes surface defects and arrests the back transfer of electrons for an enhanced charge extraction. Surface passivation of ZnFe2O4 using alumina yields enhanced charge carrier density from 8.43 × 1020 cm-3 to 18.83 × 1020 cm-3 giving a record efficiency in this class of compounds.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1039/c8cc04882gDOI Listing
September 2018

Understanding the role of silica nanospheres with their light scattering and energy barrier properties in enhancing the photovoltaic performance of ZnO based solar cells.

Phys Chem Chem Phys 2016 Oct;18(40):27818-27828

Materials Science Laboratory, Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati - 781039, Assam, India.

The present study discusses the design and development of a dye sensitized solar cell (DSSC) using a hybrid composite of ZnO nanoparticles (ZnO NP) and silica nanospheres (SiO NS). A ≈22% enhancement in the overall power conversion efficiency (PCE, η) was observed for the device fabricated with a binary hybrid composite of 1 wt% SiO NS and ZnO NP compared to the pristine ZnO NP device. A systematic investigation revealed the dual function of the silica nanospheres in enhancing the device efficacy compared to the bare ZnO NP based device. Sub-micron sized SiO NS can boost the light harvesting efficiency of the photoanode by optical confinement, resulting in increased propagation length of the incident light by multiple internal reflections, which was confirmed by UV-Vis diffused reflectance spectroscopy. Electrochemical impedance spectroscopic (EIS) analysis showed a reduced recombination of photo-generated electrons to the I/I redox shuttle in the case of the composite photoanode. The higher recombination resistance (R) in the case of a 1 wt% composite indicates that the SiO NS serves as a partial energy barrier layer to retard the interfacial recombination (back transfer) of photo-generated electrons at the working electrode/electrolyte interface, increasing the device efficiency.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1039/c6cp05544cDOI Listing
October 2016
-->