J. Mater. Sci. Technol. ›› 2024, Vol. 203: 97-107.DOI: 10.1016/j.jmst.2024.01.096

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Constructing interlaced network structure by grain boundary corrosion methods on CrCoNiFe alloy for high-performance oxygen evolution reaction and urea oxidation reaction

Qiancheng Liua, Feng Zhaoa, Xulin Yangb,c, Jie Zhua,d, Sudong Yanga,d, Lin Chena,d, Peng Zhaoa,*, Qingyuan Wanga,*, Qian Zhanga,*   

  1. aThe Institute for Advanced Study, Chengdu University, Chengdu 610106, China;
    bSchool of Mechanical Engineering, Chengdu University, Chengdu 610106, China;
    cKey Laboratory of Optoelectronic Chemical Materials and Devices, Ministry of Education, Jianghan University, Wuhan 430056, China;
    dCollege of Food and Biological Engineering, Chengdu University, Chengdu 610106, China
  • Received:2023-12-19 Revised:2024-01-24 Accepted:2024-01-28 Published:2024-12-20 Online:2024-12-16
  • Contact: *E-mail addresses: zhaopeng@cdu.edu.cn (P. Zhao), wangqy@scu.edu.cn (Q. Wang), zhangqian@cdu.edu.cn (Q. Zhang) .

Abstract: Corrosion engineering is an effective way to improve the oxygen evolution reaction (OER) activity of alloys. However, the impact of grain boundary corrosion on the structure and electrochemical performance of alloy is still unknown. Herein, the vacuum arc-melted CrCoNiFe alloys with interlaced network structures via grain boundary corrosion methods were fabricated. The grain boundaries that existed as defects were severely corroded and an interlaced network structure was formed, promoting the exposure of the active site and the release of gas bubbles. Besides, the (oxy)hydroxides layer (25 nm) on the surface could act as the true active center and improve the surface wettability. Benefiting from the unique structure and constructed surface, the CrCoNiFe-12 affords a high urea oxidation reaction (UOR) performance with the lowest overpotential of 250 mV at 10 mA/cm2 in 1 M KOH adding 0.33 M urea. The CrCoNiFe-12||Pt only required a cell voltage of 1.485 V to afford 10 mA/cm2 for UOR and long-term stability of 100 h at 10 mA/cm2 (27.6 mV decrease). These findings offer a facile strategy for designing bulk multiple-principal-element alloy electrodes for energy conversion.

Key words: Grain boundary corrosion, Interlaced network structures, (oxy)hydroxides layer, Urea oxidation reaction