A facile synthesis of hierarchical CoFe2O4 nanosheets for efficient oxygen evolution in neutral medium

• Published in: Journal of solid state chemistry 2024-03, Vol.331, p.124553, Article 124553
• Main Authors: Wang, Xinqi, Wang, Zhaoyuan, Cao, Yuanyuan, Liu, Xinxin, Zhou, Lijing, Shi, Jianjun, Guo, Biao, Li, Di, Ye, Rongrong, Zhao, Zhen
• Format: Article
• Language: English
• Subjects: CoFe2O4; Hierarchical structure; Neutral medium; Oxygen evolution reaction
• ISSN: 0022-4596
• DOI: 10.1016/j.jssc.2024.124553

It is of great significance to develop electrocatalysts that are abundant in Earth's crust, highly efficient, and exceptionally durable for the oxygen evolution reaction (OER), particularly in neutral medium. Herein, the hierarchical CoFe2O4 nanosheets supported on iron foam (CoFe2O4/IF) were prepared by the ambient spontaneous redox reaction between iron foam and Co2+ at room temperature. The chemical composition and structure of as-prepared CoFe2O4/IF nanosheets were characterized by XRD, XPS, SEM and TEM. The CoFe2O4/IF. The as-obtained CoFe2O4/IF electrode presents excellent electrocatalytic OER activity with an overpotential of 429 mV at 10 mA cm−2 and maintains the stability of 50 h in 1 M PBS. The outstanding electrocatalytic OER activity of CoFe2O4/IF can be credited to the decreased transfer resistance and unique structural features. In addition, the CoFe2O4/IF presented here holds promise for noble-metal-free OER electrocatalyst. [Display omitted] •The CoFe2O4/IF electrode was fabricated by ambient spontaneous redox reaction between iron foam and Co2+.•The sample functions as an efficient OER electrocatalyst in neutral medium.•The hierarchical architecture promotes the exposure of active sites and allows for prompt gas release.