Sulfur-deficient CoNi2S4 nanoparticles-anchored porous carbon nanofibers as bifunctional electrocatalyst for overall water splitting

Gaohui Du, Yi Fan, Lina Jia, Yunting Wang, Yawen Hao, Wenqi Zhao, Qingmei Su, Bingshe Xu

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PDF(10264 KB)
Front. Chem. Sci. Eng. ›› 2023, Vol. 17 ›› Issue (11) : 1707-1717. DOI: 10.1007/s11705-023-2308-x
RESEARCH ARTICLE

Sulfur-deficient CoNi2S4 nanoparticles-anchored porous carbon nanofibers as bifunctional electrocatalyst for overall water splitting

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Abstract

Water electrolysis technology is considered to be one of the most promising means to produce hydrogen. Herein, aiming at the problems of high overpotential and slow kinetics in water splitting, N-doped porous carbon nanofibers-coupled CoNi2S4 nanoparticles are prepared as bifunctional electrocatalyst. In the strategy, NaCl is used as the template to prepare porous carbon nanofibers with a large surface area, and sulfur vacancies are created to modulate the electronic structure of CoNi2S4. Electron spin resonance confirms the formation of abundant sulfur vacancies, which largely reduce the bandgap of CoNi2S4 from 1.68 to 0.52 eV. The narrowed bandgap is conducive to the migration of valence electrons and decreases the charge transfer resistance for electrocatalytic reaction. Moreover, the uniform distribution of CoNi2S4 nanoparticles on carbon nanofibers can prevent the aggregation and facilitate the exposure of electrochemical active sites. Therefore, the composite catalyst exhibits low overpotentials of 340 mV@100 mA·cm–2 for oxygen evolution reaction and 380 mV@100 mA·cm–2 for hydrogen evolution reaction. The assembled electrolyzer requires 1.64 V to achieve 10 mA·cm–2 for overall water-splitting with good long-term stability. The excellent performance results from the synergistic effect of porous structures, sulfur deficiency, nitrogen doping, and the well-dispersed active component.

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Keywords

nanoparticle / sulfur vacancy / porous carbon nanofiber / transition metal sulfides / electrolysis

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Gaohui Du, Yi Fan, Lina Jia, Yunting Wang, Yawen Hao, Wenqi Zhao, Qingmei Su, Bingshe Xu. Sulfur-deficient CoNi2S4 nanoparticles-anchored porous carbon nanofibers as bifunctional electrocatalyst for overall water splitting. Front. Chem. Sci. Eng., 2023, 17(11): 1707‒1717 https://doi.org/10.1007/s11705-023-2308-x

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Conflicts of interest

There are no conflicts to declare.

Acknowledgements

The authors gratefully acknowledge the financial supports from Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering (Grant No. 2022SX-TD003) and the National Natural Science Foundation of China (Grant Nos. U2032131 and 52102048).

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2023 Higher Education Press
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