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Volume 30 Issue 10
Oct.  2023
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文章导航 >  矿物冶金与材料学报（英文）  > 2023  >  30(10): 1906-1913
Xinzhuo Hu, Zhe Liu, Yi Feng, Yongfeng Zhang, Zhe Li, Zhennan Chen, Jing Mao, Jing Yang, Hui Liu, Pengfei Yin, Lei Cui, and Xiwen Du, Mechanically mixing copper and silver into self-supporting electrocatalyst for hydrogen evolution, Int. J. Miner. Metall. Mater., 30(2023), No. 10, pp. 1906-1913. https://doi.org/10.1007/s12613-023-2695-5
Cite this article as:
Xinzhuo Hu, Zhe Liu, Yi Feng, Yongfeng Zhang, Zhe Li, Zhennan Chen, Jing Mao, Jing Yang, Hui Liu, Pengfei Yin, Lei Cui, and Xiwen Du, Mechanically mixing copper and silver into self-supporting electrocatalyst for hydrogen evolution, Int. J. Miner. Metall. Mater., 30(2023), No. 10, pp. 1906-1913. https://doi.org/10.1007/s12613-023-2695-5
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研究论文

将铜和银机械混合成自支撑电催化剂用于析氢

  • 1)

    天津大学材料科学与工程学院新能源材料研究所, 天津 300072, 中国

  • 2)

    天津大学材料科学与工程学院先进焊接技术研究所, 天津 300072, 中国

  • 3)

    紫金铜业有限公司, 龙岩 364200, 中国

  • 4)

    复旦大学材料科学系, 上海 200433, 中国



  • 通讯作者:

    尹鹏飞    E-mail: pengfeiyin@tju.edu.cn

    崔雷    E-mail: leicui@tju.edu.cn

    杜希文    E-mail: xwdu@tju.edu.cn

文章亮点

  • (1) 首次证明搅拌摩擦处理在制造高催化性能的不混溶合金方面具有强大的功能。
  • (2) 开发了析氢性能优异的CuAg电极并研究了其中的催化机理。
  • (3) 分析了具有高Ag溶解度的自支撑Cu电极的微观结构。
  • 到目前为止，合成具有高Ag溶解度的自支撑Cu电极仍然是一个巨大的挑战，而且难互溶合金对酸性介质中析氢反应（HER）的影响尚未阐明。在这项工作中，我们采用搅拌摩擦处理（FSP）将铜条和银条混合成自支撑电极，其中银原子均匀分布在铜基体中。在酸性溶液中，自支撑CuAg电极表现出优异的催化活性，其周转频率（TOF）是FSP纯铜的12倍。此外，CuAg电极具有良好的稳定性，连续测试180 h后，初始电流密度（−0.835 V，可逆氢电极电位下）仅降低了1.57%。X射线衍射（XRD）和透射电子显微镜（TEM）分析表明Cu基体存在拉伸应变，X光电子能谱（XPS）结果表明从Cu向Ag的电子转移，两个因素共同导致d带上移，并改善氢吸附。密度泛函理论（DFT）计算表明在CuAg合金中的Cu位点上的氢吸附能得到优化，证实了拉伸应变和电子转移共同增强了CuAg合金的d带中心，提高了氢的吸附性，最终促进了催化活性。综上，难互溶金属的合金化是优化催化活性的可行途径。FSP在制备具有高催化性能的难互溶合金自支撑催化剂方面具有明显优势。
    • Research Article

    Mechanically mixing copper and silver into self-supporting electrocatalyst for hydrogen evolution

    + Author Affiliations
      Abstract
    • Commercial hydrogen production involves the development of efficient hydrogen evolution reaction catalysts. Herein, we adopted a friction stir processing (FSP) technique to mix immiscible metals homogenously and obtain a self-supporting copper–silver (CuAg) catalyst. The gust of Ag atoms with larger atomic sizes caused a tensile strain in the Cu matrix. Meanwhile, the chemical-potential difference induced electron transfer from Cu to Ag, and the two factors jointly led to the upshift of Cu d-band and improved the catalytic activity. Consequently, the CuAg electrode exhibited a high turnover frequency (12 times that of pure Cu), a low overpotential at high current density (superior to platinum foil), and high durability (1.57% decay over 180 h). Our work demonstrates that FSP is a powerful method for preparing self-supporting catalysts of immiscible alloys with high catalytic performance.
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