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Hierarchical NiCo2S4 Nanowire Arrays Supported on Ni Foam: An Efficient and Durable Bifunctional Electrocatalyst for Oxygen and Hydrogen Evolution Reactions

Title
Hierarchical NiCo2S4 Nanowire Arrays Supported on Ni Foam: An Efficient and Durable Bifunctional Electrocatalyst for Oxygen and Hydrogen Evolution Reactions
Authors
Sivanantham, A[Sivanantham, Arumugam]Ganesan, P[Ganesan, Pandian]Shanmugam, S[Shanmugam, Sangaraju]
DGIST Authors
Sivanantham, A[Sivanantham, Arumugam]; Ganesan, P[Ganesan, Pandian]; Shanmugam, S[Shanmugam, Sangaraju]
Issue Date
2016-07-12
Citation
Advanced Functional Materials, 26(26), 4661-4672
Type
Article
Article Type
Article
Keywords
Alkaline WaterAlkaline Water ElectrolyzerCatalyst ActivityElectro-Chemical ElectrodesElectrocatalystsElectrodesElectrolytesElectrolytic CellsHydrogenHydrogen EvolutionHydrogen ProductionNanowiresNickelNiCo2S4OxygenOxygen EvolutionSolar-to-HydrogenSolar-to-Hydrogen GenerationSolar Power Generation
ISSN
1616-301X
Abstract
A recent approach for solar-to-hydrogen generation has been water electrolysis using efficient, stable, and inexpensive bifunctional electrocatalysts within strong electrolytes. Herein, the direct growth of 1D NiCo2S4 nanowire (NW) arrays on a 3D Ni foam (NF) is described. This NiCo2S4 NW/NF array functions as an efficient bifunctional electrocatalyst for overall water splitting with excellent activity and stability. The 3D-Ni foam facilitates the directional growth, exposing more active sites of the catalyst for electrochemical reactions at the electrode–electrolyte interface. The binder-free, self-made NiCo2S4 NW/NF electrode delivers a hydrogen production current density of 10 mA cm–2 at an overpotential of 260 mV for the oxygen evolution reaction and at 210 mV (versus a reversible hydrogen electrode) for the hydrogen evolution reaction in 1 m KOH. This highly active and stable bifunctional electrocatalyst enables the preparation of an alkaline water electrolyzer that could deliver 10 mA cm–2 under a cell voltage of 1.63 V. Because the nonprecious-metal NiCo2S4 NW/NF foam-based electrodes afford the vigorous and continuous evolution of both H2 and O2 at 1.68 V, generated using a solar panel, they appear to be promising water splitting devices for large-scale solar-to-hydrogen generation. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
URI
http://hdl.handle.net/20.500.11750/2239
DOI
10.1002/adfm.201600566
Publisher
Wiley-VCH Verlag
Related Researcher
Files:
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Collection:
Energy Science and EngineeringAdvanced Energy Materials Laboratory1. Journal Articles


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