Huang Zanling, Li Peipei, Feng Meijun, Zhu Weiwei, Woldu Abebe Reda, Tong Qing-Xiao, Hu Liangsheng
Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, Shantou University, Shantou 515063, P. R. China.
Department of Mechanical Engineering, Shantou University, Guangdong 515063, P. R. China.
Inorg Chem. 2024 Aug 19;63(33):15493-15502. doi: 10.1021/acs.inorgchem.4c02646. Epub 2024 Aug 8.
Fe has been reported to play a crucial role in improving the catalytic activity and stability of Ni/Co-based electrocatalysts for the oxygen evolution reaction (OER), while the Fe effect remains intangible. Here, we design several experiments to identify the activity and stability improvement using porous anodized nickel foam (ANF) as the electrode and 1.0 M KOH containing 1000 μM Fe(III) ions as the electrolyte. Systematic investigations reveal that Ni sites serve as hosts to capture Fe ions to create active FeNi-based intermediates on the surface of ANF to improve the OER activity significantly, and Fe ions regulate catalytic equilibrium and maintain the stability for a long time. The system exhibits 242 and 343 mV overpotentials to reach 10 and 1000 mA cm current densities and a robust stability of 360 h at an industrially suitable current density (1000 mA cm). This work expands insights into the Fe(III) catalysis effect on the OER efficiency of Ni-based catalysts and provides an economical and practical way to commercial application.
据报道，铁在提高用于析氧反应（OER）的镍/钴基电催化剂的催化活性和稳定性方面起着关键作用，而铁的作用机制仍不明确。在此，我们设计了几个实验，以多孔阳极氧化泡沫镍（ANF）为电极，以含有1000 μM铁（III）离子的1.0 M氢氧化钾溶液为电解质，来确定活性和稳定性的提高情况。系统研究表明，镍位点作为主体捕获铁离子，在ANF表面形成活性的铁镍基中间体，从而显著提高OER活性，并且铁离子调节催化平衡并长时间保持稳定性。该体系在达到10和1000 mA cm电流密度时分别具有242和343 mV的过电位，并且在工业适用电流密度（1000 mA cm）下具有360 h的稳健稳定性。这项工作拓展了对铁（III）催化对镍基催化剂OER效率影响的认识，并为商业应用提供了一种经济实用的方法。
