华中科技大学王春栋团队报道了提高水氧化反应动力学的Fe-Ni-F电催化剂。相关研究成果于2024年2月6日发表于国际一流学术期刊《结构化学》。

高活性和低成本的析氧反应（OER）催化电极对于通过水分解开发绿色氢是极其重要的。

该文中，使用氟化铵通过简单的退火策略制备了一种先进的Fe–Ni–F电催化剂，通过XRD、FESEM、TEM、EDS、BET和XPS测量揭示了其结构特征。所制备的Fe–Ni–F在10 mA cm^–2的电流密度下具有277 mV的低过电位和49 mV dec^-1的小Tafel斜率，显著优于其他对照样品以及最先进的RuO₂。该Fe–Ni–F催化剂的先进性也可以从KOH碱性溶液中的强大稳定性中得到进一步证明，在连续运行24小时后，其降解率为5.41%。

经过分析，这表明良好的催化活性应归因于形成的双金属（氧）氢氧化物，因为引入了氟化物，以及铁和镍对氧气生成的协同作用。

该项工作代表了Fe和/或Ni基氟化物作为低能耗制氧的有效催化剂的潜力。

附：英文原文

Title: Fe–Ni–F electrocatalyst for enhancing reaction kinetics of water oxidation

Author: Yi Zhang, Biao Wang, Chao Hu, Muhammad Humayun, Yaping Huang, Yulin Cao, Mosaad Negem, Yigang Ding, Chundong Wang

Issue&Volume: 2024-02-06

Abstract: Highly active and low-cost oxygen evolution reaction (OER) catalytic electrodes are extremely essential for exploration of green hydrogen via water splitting. Herein, an advanced Fe–Ni–F electrocatalyst is fabricated by a facile annealing strategy using ammonium fluoride, of which the structure feature is unveiled by XRD, FESEM, TEM, EDS, BET, and XPS measurements. The as-prepared Fe–Ni–F addresses a low overpotential of 277 mV and a small Tafel slope of 49 mV dec1 at a current density of 10 mA cm–2, significantly outperforming other control samples as well as the state-of-the-art RuO2. The advanced nature of our Fe–Ni–F catalyst could also be further evidenced from the robust stability in KOH alkaline solution, showing as 5.41% degradation after 24 h continuous working. Upon analysis, it suggests that the decent catalytic activity should be attributed to the formed bimetallic (oxy)hydroxides because of the introduction of fluoride, and the synergistic effect of iron and nickel towards oxygen generation. This work represents the potential of Fe and/or Ni-based fluoride as efficient catalyst for low-energy consumption oxygen generation.

DOI: 10.1016/j.cjsc.2024.100243

Source: http://cjsc.ac.cn/cms/issues/563