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Hierarchical Nickel-Cobalt Dichalcogenide Nanostructure as an Efficient Electrocatalyst for Oxygen Evolution Reaction and a Zn-Air Battery

Title
Hierarchical Nickel-Cobalt Dichalcogenide Nanostructure as an Efficient Electrocatalyst for Oxygen Evolution Reaction and a Zn-Air Battery
Authors
Hyun, Su YeonShanmugam, Sangaraju
DGIST Authors
Shanmugam, Sangaraju
Issue Date
2018-08
Citation
ACS Omega, 3(8), 8621-8630
Type
Article
Article Type
Article
Keywords
BIFUNCTIONAL ELECTROCATALYSTWATER ELECTROLYSISNEUTRAL PHHIGHLY EFFICIENTNANOWIRE ARRAYSDOPED CARBONNI FOAMALKALINEHYDROGENOXIDATION
ISSN
2470-1343
Abstract
A unique three-dimensional (3D) structure consisting of a hierarchical nickel-cobalt dichalcogenide spinel nanostructure is investigated for its electrocatalytic properties at benign neutral and alkaline pH and applied as an air cathode for practical zinc-air batteries. The results show a high oxygen evolution reaction catalytic activity of nickel-cobalt sulfide nanosheet arrays grown on carbon cloth (NiCo2S4 NS/CC) over the commercial benchmarking catalyst under both pH conditions. In particular, the NiCo2S4 NS/CC air cathode shows high discharge capacity, a narrow potential gap between discharge and charge, and superior cycle durability with reversibility, which exceeds that of commercial precious metal-based electrodes. The excellent performance of NiCo2S4 NS/CC in water electrolyzers and zinc-air batteries is mainly due to highly exposed electroactive sites with a rough surface, morphology-based advantages of nanosheet arrays, good adhesion between NiCo2S4 and the conducting carbon cloth, and the active layer formed of nickel-cobalt (oxy)hydroxides during water splitting. These results suggest that NiCo2S4 NS/CC could be a promising candidate as an efficient electrode for high-performance water electrolyzers and rechargeable zinc-air batteries. © 2018 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/9232
DOI
10.1021/acsomega.8b01375
Publisher
American Chemical Society
Related Researcher
  • Author Shanmugam, Sangaraju Advanced Energy Materials Laboratory
  • Research Interests Electrocatalysts for fuel cells; water splitting; metal-air batteries; Polymer electrolyte membranes for fuel cells; flow batteries; Hydrogen generation and utilization
Files:
Collection:
Department of Energy Science and EngineeringAdvanced Energy Materials Laboratory1. Journal Articles


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