Publications by authors named "Xinglong Guan"

3 Publications

  • Page 1 of 1

Bimetallic ZIF-Derived Co/N-Codoped Porous Carbon Supported Ruthenium Catalysts for Highly Efficient Hydrogen Evolution Reaction.

Nanomaterials (Basel) 2021 May 6;11(5). Epub 2021 May 6.

Lab of Advanced Nano-Structure and Transfer Process, Department of Chemical Engineering, Tianjin University, Tianjin 300354, China.

Exploring the economical, powerful, and durable electrocatalysts for hydrogen evolution reaction (HER) is highly required for practical application. Herein, nanoclusters-decorated ruthenium, cobalt nanoparticles, and nitrogen codoped porous carbon ([email protected]) are prepared with bimetallic zeolite imidazole frameworks (ZnCo-ZIF) as the precursor. Thus, the prepared [email protected] catalyst with a low Ru loading of 3.13 wt% exhibits impressive HER catalytic behavior in 1 M KOH, with an overpotential of only 30 mV at the current density of 10 mA cm, Tafel slope as low as 32.1 mV dec, and superior stability for long-time running with a commercial 20 wt% Pt/C. The excellent electrocatalytic properties are primarily by virtue of the highly specific surface area and porosity of carbon support, uniformly dispersed Ru active species, and rapid reaction kinetics of the interaction between Ru and O.
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http://dx.doi.org/10.3390/nano11051228DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8148513PMC
May 2021

Bifunctional Graphene-Based Metal-Free Catalysts for Oxidative Coupling of Amines.

ACS Appl Mater Interfaces 2019 Sep 20;11(35):31844-31850. Epub 2019 Aug 20.

Lab of Advanced Nano Structures & Transfer Processes, Department of Chemical Engineering , Tianjin University , Tianjin 300354 , P. R. China.

Graphene oxide (GO), an emerging material ornamented with oxygen-containing functional groups, is becoming a promising alternative for various applications. The piranha solution treatment of GO can increase oxygen-containing functional groups and result in improved graphene oxide (IGO), as well as restore the functional groups lost because of the reaction. It is found that GO can oxidize the amine to the corresponding imine in the absence of oxygen and a catalyst, and the obtained IGO even shows higher activity. In addition, the piranha solution can partially restore the reactivity of GO after the reaction. The different roles of oxygen-containing functional groups in the oxidative coupling reaction are investigated. A possible reaction mechanism for the oxidation of benzylamine to -benzylidene benzylamine is also proposed.
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http://dx.doi.org/10.1021/acsami.9b08741DOI Listing
September 2019

3D self-supported Ni(PO)-MoO nanorods anchored on nickel foam for highly efficient overall water splitting.

Nanoscale 2018 Dec 27;10(47):22173-22179. Epub 2018 Nov 27.

Lab of Advanced Nano Structures & Transfer Processes, Department of Chemical Engineering, Tianjin University, Tianjin 300354, P. R. China.

Electrolyzing water as a sustainable energy source is a promising and appealing method to resolve the environmental crisis. Developing efficient and stable bifunctional electrocatalysts for the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) is crucial and challenging in the overall water splitting process. Herein, we report the synthesis of Ni(PO)-MoO nanorods anchored on nickel foam (Ni(PO)-MoO/NF) within a two-step strategy and their application as a bifunctional water splitting electrocatalyst. The results show that the optimal Ni(PO)-MoO/NF electrodes exhibit superior catalytic activity with robust durability and ultralow overpotentials of 86 mV for HER and 234 mV for OER to achieve 10 mA cm (η) in alkaline solution. The favorable performance of the obtained catalyst is attributed mainly to the synergetic effect between Ni(PO) and MoO, as well as the self-supporting porous conductive substrate. As a result, the integrated Ni(PO)-MoO/NF electrodes deliver η at a small potential of 1.47 V for overall water splitting, highlighting a promising application as a bifunctional electrocatalyst.
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http://dx.doi.org/10.1039/c8nr07577hDOI Listing
December 2018
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