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Hierarchical NiCo2S4 Nanowire Arrays Supported on Ni Foam: An Efficient and Durable Bifunctional Electrocatalyst for Oxygen and Hydrogen Evolution Reactions
- Hierarchical NiCo2S4 Nanowire Arrays Supported on Ni Foam: An Efficient and Durable Bifunctional Electrocatalyst for Oxygen and Hydrogen Evolution Reactions
- Sivanantham, Arumugam; Ganesan, Pandian; Shanmugam, Sangaraju
- DGIST Authors
- Shanmugam, Sangaraju
- Issue Date
- Advanced Functional Materials, 26(26), 4661-4672
- Article Type
- Alkaline Water; Alkaline Water Electrolyzer; Catalyst Activity; Electro-Chemical Electrodes; Electrocatalysts; Electrodes; Electrolytes; Electrolytic Cells; Hydrogen; Hydrogen Evolution; Hydrogen Production; Nanowires; Nickel; NiCo2S4; Oxygen; Oxygen Evolution; Solar-to-Hydrogen; Solar-to-Hydrogen Generation; Solar Power Generation
- 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.
- Wiley-VCH Verlag
- Related Researcher
Advanced Energy Materials Laboratory
Electrocatalysts for fuel cells; water splitting; metal-air batteries; Polymer electrolyte membranes for fuel cells; flow batteries; Hydrogen generation and utilization
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- Department of Energy Science and EngineeringAdvanced Energy Materials Laboratory1. Journal Articles
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