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Strengthen metal-oxygen covalency of CoFe-layered double hydroxide for efficient mild oxygen evolution

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Abstract

Oxygen evolution reaction (OER) is crucial for hydrogen production as well as other energy storage technologies. CoFe-layered double hydroxide (CoFe-OH) has been widely considered as one of the most efficient electrocatalysts for OER in basic aqueous solution. However, it still suffers from low activity in neutral electrolyte. This paper describes partially oxidized CoFe-OH (PO-CoFe-OH) with enhanced covalency of M-O bonds and displays enhanced OER performance under mild condition. Mechanism studies reveal the suitably enhanced M-O covalency in PO-CoFe-OH shifts the OER mechanism to lattice oxygen oxidation mechanism and also promotes the rate-limiting deprotonation, providing superior OER performance. It just requires the overpotentials of 186 and 365 mV to drive the current density densities of 1 and 10 mA·cm−2 in 0.1 M KHCO3 aqueous solution (pH = 8.3), respectively. It provides a new process for rational design of efficient catalysts for water oxidation in mild conditions.

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Acknowledgements

We acknowledge the support from the National Natural Science Foundation of China (Nos. 21878202, 21975175, and U1932119), the research project supported by Shanxi Scholarship Council of China (No. 2017-041), the Natural Science Foundation of Shanxi Province (No. 201801D121052), and the National Key Basic Research Program of China (No. 2017YFA0403402).

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  1. Dazhong Zhong and Tan Li contributed equally to this work.

Authors and Affiliations

  1. College of Chemistry and Chemical Engineering, Taiyuan University of Technology; Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization, Taiyuan, 030024, China

    Dazhong Zhong, Dong Wang, Genyan Hao, Guang Liu, Qiang Zhao & Jinping Li

  2. School of Environment and Energy, South China University of Technology, Guangzhou, 51006, China

    Tan Li

  3. Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Shanghai, 200000, China

    Lina Li

  4. Key Laboratory of Coal Science and Technology, Taiyuan University of Technology, Ministry of Education and Shanxi Province, Taiyuan, 030024, China

    Jiancheng Wang & Jinping Li

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  1. Dazhong Zhong
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Zhong, D., Li, T., Wang, D. et al. Strengthen metal-oxygen covalency of CoFe-layered double hydroxide for efficient mild oxygen evolution. Nano Res. 15, 162–169 (2022). https://doi.org/10.1007/s12274-021-3451-7

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