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Volume 13
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10.3390/catal13050881
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Article

Facile Construction of Three-Dimensional Heterostructured CuCo2S4 Bifunctional Catalyst for Alkaline Water Electrolysis

by
Shengnan Li
,
Pengli Ma
,
Jishuang Yang
,
Srinivasan Krishnan
,
Kannan S. Kesavan
,
Ruimin Xing
* and
Shanhu Liu
*
Henan Key Laboratory of Polyoxometalate Chemistry, College of Chemistry and Molecular Sciences, Henan University, Kaifeng 475004, China
*
Authors to whom correspondence should be addressed.
Catalysts 2023, 13(5), 881; https://doi.org/10.3390/catal13050881
Submission received: 4 April 2023 / Revised: 7 May 2023 / Accepted: 10 May 2023 / Published: 13 May 2023
(This article belongs to the Special Issue Surface Microstructure Design for Advanced Catalysts)
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Abstract

Developing an efficient multi-functional electrocatalyst with high efficiency and low cost to replace noble metals is significantly crucial for the industrial water electrolysis process and for producing sustainable green hydrogen (H2) fuel. Herein, ultrathin CuCo2S4 nanosheets assembled into highly open three-dimensional (3D) nanospheres of CuCo2S4 (Cu/Co = 33:67) were prepared by a facile one-pot solvothermal approach and utilized as a bifunctional electrocatalyst for efficient overall water splitting. The as-prepared CuCo2S4 is characterized structurally and morphologically; the BET surface area of the CuCo2S4 (Cu/Co = 33:67) catalyst was found to have a larger specific surface area (21.783 m2g−1) than that of other catalysts with a Cu/Co ratio of 67:33, 50:50, and 20:80. Benefiting from a highly open structure and ultrathin nanosheets with excellent exposure to catalytically active sites, CuCo2S4 (Cu/Co = 33:67) is identified as an efficient catalyst for the proton reduction and oxygen evolution reactions in 1 M KOH with an overpotential of 182 and 274 mV at 10 mA cm−2, respectively. As expected, a low cell voltage of 1.68 V delivers a current density of 10 mA cm−2. Stability and durability are also greatly enhanced under harsh alkaline conditions. Therefore, this work provides a simple strategy for the rational design of spinel-based transition metal sulfide catalysts for electrocatalysis.
Keywords: alkaline water electrolysis; solvothermal; CuCo2S4; electrocatalyst; hydrogen evolution reaction; oxygen evolution reaction; overall water splitting alkaline water electrolysis; solvothermal; CuCo2S4; electrocatalyst; hydrogen evolution reaction; oxygen evolution reaction; overall water splitting
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MDPI and ACS Style

Li, S.; Ma, P.; Yang, J.; Krishnan, S.; Kesavan, K.S.; Xing, R.; Liu, S. Facile Construction of Three-Dimensional Heterostructured CuCo2S4 Bifunctional Catalyst for Alkaline Water Electrolysis. Catalysts 2023, 13, 881. https://doi.org/10.3390/catal13050881

AMA Style

Li S, Ma P, Yang J, Krishnan S, Kesavan KS, Xing R, Liu S. Facile Construction of Three-Dimensional Heterostructured CuCo2S4 Bifunctional Catalyst for Alkaline Water Electrolysis. Catalysts. 2023; 13(5):881. https://doi.org/10.3390/catal13050881

Chicago/Turabian Style

Li, Shengnan, Pengli Ma, Jishuang Yang, Srinivasan Krishnan, Kannan S. Kesavan, Ruimin Xing, and Shanhu Liu. 2023. "Facile Construction of Three-Dimensional Heterostructured CuCo2S4 Bifunctional Catalyst for Alkaline Water Electrolysis" Catalysts 13, no. 5: 881. https://doi.org/10.3390/catal13050881

APA Style

Li, S., Ma, P., Yang, J., Krishnan, S., Kesavan, K. S., Xing, R., & Liu, S. (2023). Facile Construction of Three-Dimensional Heterostructured CuCo2S4 Bifunctional Catalyst for Alkaline Water Electrolysis. Catalysts, 13(5), 881. https://doi.org/10.3390/catal13050881

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