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Engineering Ternary Copper-Cobalt Sulfide Nanosheets as High-performance Electrocatalysts toward Oxygen Evolution Reaction

1
Siyuan Laboratory, Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials, Department of Physics, Jinan University, Guangzhou 510632, China
2
Department of Chemistry, Jinan University, Guangzhou, Guangdong 510632, China
3
Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Catalysts 2019, 9(5), 459; https://doi.org/10.3390/catal9050459
Received: 11 April 2019 / Revised: 13 May 2019 / Accepted: 15 May 2019 / Published: 17 May 2019
(This article belongs to the Special Issue Electrocatalytic Water Oxidation)
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Abstract

The rational design and development of the low-cost and effective electrocatalysts toward oxygen evolution reaction (OER) are essential in the storage and conversion of clean and renewable energy sources. Herein, a ternary copper-cobalt sulfide nanosheets electrocatalysts (denoted as CuCoS/CC) for electrochemical water oxidation has been synthesized on carbon cloth (CC) via the sulfuration of CuCo-based precursors. The obtained CuCoS/CC reveals excellent electrocatalytic performance toward OER in 1.0 M KOH. It exhibits a particularly low overpotential of 276 mV at current density of 10 mA cm−2, and a small Tafel slope (58 mV decade−1), which is superior to the current commercialized noble-metal electrocatalysts, such as IrO2. Benefiting from the synergistic effect of Cu and Co atoms and sulfidation, electrons transport and ions diffusion are significantly enhanced with the increase of active sites, thus the kinetic process of OER reaction is boosted. Our studies will serve as guidelines in the innovative design of non-noble metal electrocatalysts and their application in electrochemical water splitting View Full-Text
Keywords: oxygen evolution reaction; water oxidation; ternary copper-cobalt sulfide; nanosheets oxygen evolution reaction; water oxidation; ternary copper-cobalt sulfide; nanosheets
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Luo, H.; Lei, H.; Yuan, Y.; Liang, Y.; Qiu, Y.; Zhu, Z.; Wang, Z. Engineering Ternary Copper-Cobalt Sulfide Nanosheets as High-performance Electrocatalysts toward Oxygen Evolution Reaction. Catalysts 2019, 9, 459.

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