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Optimized valence state of Co and Ni in high-entropy alloy for high active-stable OER

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高熵合金表现出良好潜在的电催化水分解性能，但其受到制备过程中高能耗的限制。此外，复杂的原子分布使高熵合金的电子结构调控仍然具有很大的挑战性。本文采用高能球磨结合去合金化方法制备了纳米多孔NiCuMnCoFe高熵合金。Fe的引入显著提高了Ni3+和Co3+的比例。大量高价态Ni和Co原子有利于在析氧反应过程中形成关键的活性中间体，并赋予纳米多孔NiCuMnCoFe高熵合金283 mV的低过电位和81.09 mV·dec-1的优异Tafel斜率（10 mA·cm-2）。同时，纳米多孔NiCuMnCoFe高熵合金表现出优异的耐久性，其活性优于大多数其他报道的高熵合金类催化剂。优化的d带中心决定了纳米多孔NiCuMnCoFe高熵合金中Fe、Co和Ni位点中间体的吸附和解吸之间的平衡，并确定了析氧反应的决速步是O2形成步骤。这项工作为调控高熵合金的元素价态并实现高效电催化水分解铺平道路。

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Nos. 52271011 and 52102291). We would like to thank the Analytical & Testing Center of Tiangong University for Transmission Electron Microscope work. And many thanks also go to Dr. Zhonghui Gao for critical reading of the manuscript.

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Authors and Affiliations

  1. School of Materials Science and Engineering, State Key Laboratory of Separation Membrane and Membrane Processes, Tiangong University, Tianjin, 300387, China

    Zhi-Jia Zhang, Jun-Peng Guo, Shi-Hao Sun, Yu-Wen Zhao, Yi-Fang Zhang, Meng-Meng Zhang & Yong Jiang

  2. School of Chemistry and Life Sciences, Key Laboratory of Advanced Electrode Materials for Novel Solar Cells for Petroleum and Chemical Industry of China, Suzhou University of Science and Technology, Suzhou, 215009, China

    Chun-Sheng Li & Yan Sun

  3. School of Electronic and Information Engineering, Institute of Quantum Materials and Devices, Tiangong University, Tianjin, 300387, China

    Zhi-Jia Zhang & Yong Jiang

  4. School of Mechanical Engineering, Tiangong University, Tianjin, 300387, China

    Qi Sun & Zhen-Yang Yu

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  1. Zhi-Jia Zhang
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Zhang, ZJ., Guo, JP., Sun, SH. et al. Optimized valence state of Co and Ni in high-entropy alloy for high active-stable OER. Rare Met. 42, 3607–3613 (2023). https://doi.org/10.1007/s12598-023-02448-0

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