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Nano Research 2024, 17(5): 3785-3793 https://doi.org/10.1007/s12274-023-6316-4
Research Article | Issue | Published: 29 December 2023

An effective bimetallic oxide catalyst of RuO2-Co3O4 for alkaline overall water splitting

Show Author's Information Fangfang Ren1,  Jiayu Xu1,2,  Ligang Feng2( )
College of Chemical and Environmental Engineering, Yancheng Teachers University, Yancheng 224007, China
School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China
Keywords:
metal-organic frameworks, cobalt oxide, heterostructures, overall water splitting, ruthenium dioxide
Topics:
Electrocatalysis
Cite this article:
Ren F, Xu J, Feng L. An effective bimetallic oxide catalyst of RuO2-Co3O4 for alkaline overall water splitting. Nano Research, 2024, 17(5): 3785-3793. https://doi.org/10.1007/s12274-023-6316-4
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Abstract Full text Electronic supplementary material About this article

The rational design of effective bifunctional electrocatalysts is of paramount importance for overall water-splitting technology in sustainable energy conversion. Herein, bimetallic oxide catalysts (RuO2-Co3O4) derived from Ru combined MOF-derivatives (MOF = metal-organic framework) were demonstrated effective for overall water splitting in an alkaline solution, owing to the combined merits such as the two-dimensional interconnected network structure, the synergetic coupling effects and increased chemical stability. The as-prepared RuO2-Co3O4 only requires an overpotential of 260 mV for oxygen evolution and 75 mV for hydrogen evolution at 10 mA/cm2 in 1 M KOH solution; a low cell voltage of 1.54 V was required to reach the kinetic current density of 10 mA/cm2 for the water electrolysis when supporting on glass carbon electrode, and very good stability for 40 h was observed. Experimental and theoretical results demonstrated the electronic structure optimization of bimetallic RuO2-Co3O4 compared to the individual metal oxide, which promoted interface charges redistribution and the d-band center downshift, resulting in increased activity and stability for water-splitting reactions. This work provides a feasible approach for developing bimetallic oxides for application in energy-relevant electrocatalysis reactions.


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Electronic supplementary material
About this article

An effective bimetallic oxide catalyst of RuO2-Co3O4 for alkaline overall water splitting

Show Author's information Fangfang Ren1, Jiayu Xu1,2, Ligang Feng2( )
College of Chemical and Environmental Engineering, Yancheng Teachers University, Yancheng 224007, China
School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China

Abstract

The rational design of effective bifunctional electrocatalysts is of paramount importance for overall water-splitting technology in sustainable energy conversion. Herein, bimetallic oxide catalysts (RuO2-Co3O4) derived from Ru combined MOF-derivatives (MOF = metal-organic framework) were demonstrated effective for overall water splitting in an alkaline solution, owing to the combined merits such as the two-dimensional interconnected network structure, the synergetic coupling effects and increased chemical stability. The as-prepared RuO2-Co3O4 only requires an overpotential of 260 mV for oxygen evolution and 75 mV for hydrogen evolution at 10 mA/cm2 in 1 M KOH solution; a low cell voltage of 1.54 V was required to reach the kinetic current density of 10 mA/cm2 for the water electrolysis when supporting on glass carbon electrode, and very good stability for 40 h was observed. Experimental and theoretical results demonstrated the electronic structure optimization of bimetallic RuO2-Co3O4 compared to the individual metal oxide, which promoted interface charges redistribution and the d-band center downshift, resulting in increased activity and stability for water-splitting reactions. This work provides a feasible approach for developing bimetallic oxides for application in energy-relevant electrocatalysis reactions.

Keywords: metal-organic frameworks, cobalt oxide, heterostructures, overall water splitting, ruthenium dioxide

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Publication history
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Acknowledgements

Publication history

Received: 06 October 2023
Revised: 25 October 2023
Accepted: 03 November 2023
Published: 29 December 2023
Issue date: May 2024

Copyright

© Tsinghua University Press 2023

Acknowledgements

Acknowledgements

L. G. F. and J. Y. X. appreciated the financial support of the National Natural Science Foundation of China (Nos. 21972124 and 22272148) and a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institution. F. F. R. would like to thank the support of National Natural Science Foundation of China (No. 22302168).

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