The demand for non-noble bifunctional electrocatalysts for overall water splitting was increased for simplifying water-splitting systems and accelerating commercialization. Herein, oxygen vacancy-rich nanoporous nickel foam (NF) electrodes decorated with nanosized NiFe layered double hydroxide are fabricated by a facile and scalable electrochemical treatment using FeCl₃ solutions as OER and HER electrocatalysts in an alkaline medium. The roles of Cl^– and Fe³⁺ ions are analyzed by electrochemical and surface-enhanced X-ray analysis techniques. The Cl anions increase the active sites by producing nanopores on the NF surface and promote oxygen vacancies, while the Fe cations enhance the inherent catalytic activity for water oxidation. The FeCl₃-treated NF shows enhanced catalytic activities and maintains an overpotential of 520 mV at 100 mA cm^–2 for 150 h in a 10 cm² single cell. The results demonstrate that the simple electrochemical treatment is a promising method to produce oxygen vacancy-induced scalable electrodes with large surface areas for various applications.

中文翻译：

---

氧空位诱导氢氧化镍铁作为可扩展，高效且稳定的碱性总水分解电极

为了简化水分解系统并加速商业化，对用于整体水分解的非贵金属双功能电催化剂的需求增加了。在此，使用FeCl ₃溶液作为OER和HER电催化剂，在碱性介质中，通过简便，可扩展的电化学处理，制备了用纳米NiFe层状双氢氧化物装饰的富氧空位纳米多孔镍泡沫（NF）电极。氯的作用^-和Fe ³⁺离子被电化学和表面增强X射线分析技术进行分析。Cl阴离子通过在NF表面产生纳米孔来增加活性位点并促进氧空位，而Fe阳离子则增强了水氧化的固有催化活性。该的FeCl ₃经过处理的NF显示出增强的催化活性，并在10 cm ^2的单电池中在100 mA cm ^–2的条件下保持520 mV的超电势150 h 。结果表明，简单的电化学处理是一种有前途的方法，可以生产出氧表面积大的氧空位可扩展电极，适合各种应用。