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CoS2-TiO2 hybrid nanostructures: efficient and durable bifunctional electrocatalysts for alkaline electrolyte membrane water electrolyzers

Title
CoS2-TiO2 hybrid nanostructures: efficient and durable bifunctional electrocatalysts for alkaline electrolyte membrane water electrolyzers
Authors
Ganesan, PandianSivanantham, ArumugamShanmugam, Sangaraju
DGIST Authors
Shanmugam, Sangaraju
Issue Date
2018-01
Citation
Journal of Materials Chemistry A, 6(3), 1075-1085
Type
Article
Article Type
Article
Keywords
OXYGEN EVOLUTION REACTIONMODIFIED TIO2 NANOPARTICLESHYDROGEN EVOLUTIONNANOWIRE ARRAYSIRON SULFIDESFUEL-CELLSCARBONCATALYSTSREDUCTIONNANOCOMPOSITES
ISSN
2050-7488
Abstract
The development of efficient catalysts to overcome the significant overpotential of the oxygen evolution reaction (OER) is the key bottleneck in the large-scale production of pure hydrogen. In the present work, we describe a simple approach for the fabrication of CoS2-TiO2 hybrid catalysts by the heat treatment of a cobalt thiourea complex in the presence of TiO2. We show the CoS2-TiO2 hybrid as a bi-functional electrocatalyst for overall water splitting in alkaline electrolyte membrane water electrolyzers. The optimal CoS2-TiO2 hybrid offered low overpotentials of 231 and 198 mV for the OER and HER, respectively. Fundamental studies pertaining to the role of TiO2 in enhancing the catalytic activity of the materials using optical and electrochemical band gap measurements of the CoS2-TiO2 hybrids were carried out. Additionally, the constructed MEA using the CoS2-TiO2 hybrid showed higher performance with an approximately 234 mA cm-2 current density at a cell voltage of 1.9 V and exhibited extended durable operation over 200 h, as compared to the MEA constructed with state-of-the-art all-noble-metal electrodes. © 2018 The Royal Society of Chemistry.
URI
http://hdl.handle.net/20.500.11750/5775
DOI
10.1039/c7ta09096j
Publisher
ROYAL SOC CHEMISTRY
Related Researcher
Files:
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Collection:
Energy Science and EngineeringAdvanced Energy Materials Laboratory1. Journal Articles


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