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Issue 44, 2017
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Engineering Co9S8/WS2 array films as bifunctional electrocatalysts for efficient water splitting

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Abstract

An elaborate design of highly active, low-cost and durable bifunctional electrocatalysts for both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) in water splitting is undoubtedly vital but challenging to develop the hydrogen economy. Herein, we report a novel kind of three-dimensional Co9S8/WS2 electrocatalyst 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 cmgeometric area−2 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 opens an exciting new avenue to explore the use of composite sulfides toward full water splitting.

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

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Supplementary files

Article information


Submitted
26 Sep 2017
Accepted
04 Oct 2017
First published
04 Oct 2017

J. Mater. Chem. A, 2017,5, 23361-23368
Article type
Paper

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

S. Peng, L. Li, J. Zhang, T. L. Tan, T. Zhang, D. Ji, X. Han, F. Cheng and S. Ramakrishna, J. Mater. Chem. A, 2017, 5, 23361
DOI: 10.1039/C7TA08518D

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