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Engineering Co9S8/WS2 array films as bifunctional electrocatalysts for efficient water splitting

Abstract

Elaborate design of high-active, low-cost and durable bifunctional electrocatalysts for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in water splitting is undoubtedly vital but challenging to develop hydrogen economy. Herein, we report a novel kind of three-dimensional Co9S8/WS2 electrocatalysts with array structures as efficient bifunctional electrocatalysts for overall water splitting. The resulting hierarchically Co9S8/WS2, as a robust integrated 3D hydrogen-evolving electrode, can deliver a current density of 10 mA cm-2geometric area at an overpotential of 138 mV in alkaline media, together with high stability. Combined with density functional theory calculations, the superior electrocatalytic activity is attributed to the unique structures and synergistic effect of chemical and electronic couplings between Co9S8 and WS2. Furthermore, this bifunctional electrode enables a high-performance alkaline water electrolyzer with 10 mA cm-2 at a cell voltage of 1.65 V. Therefore, this unique 3D architecture offers open an exciting new avenue to explore the use of composite sulfides toward full water splitting.

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Publication details

The article was accepted on 04 Oct 2017 and first published on 04 Oct 2017


Article type: Paper
DOI: 10.1039/C7TA08518D
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Engineering Co9S8/WS2 array films as bifunctional electrocatalysts for efficient water splitting

    S. Peng, L. Li, J. Zhang, T. L. Tan, T. Zhang, J. Dongxiao, X. Han, F. Cheng and S. Ramakrishna, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA08518D

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