The Regulation of Multiple 3d Orbits Triggers the Self-Equilibrium Effect of High-Entropy Oxide in Seawater Electrolysis.

Huimin Mao, Xinyue Qu, Hongsheng Ma, Jingqi Chi, Zhenyu Xiao,Yongming Chai,Zexing Wu, Xiaobin Liu,Lei Wang

Journal of colloid and interface science（2025）

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Abstract

Seawater electrolysis is undoubtedly a more sustainable alternative to pure water electrolysis at present. However, it is hindered by the relatively slow kinetics of the oxygen evolution reaction and the detrimental effects of chloride ions in seawater that require resolution. In this study, we developed a straightforward synthesis method and successfully prepared FeNiCoMnCr high-entropy oxide (HEO). The strong coupling among multiple 3d orbitals of the transition metals allows for significant regulation of the catalyst's electronic structure, enabling oxidation and reduction processes at the active site to spontaneously approach an equilibrium state. Additionally, Lewis acid Cr6+ selectively adsorbs OH-, further enhancing both activity and stability of the catalyst in alkaline seawater. This research provides valuable insights into utilizing HEOs for seawater electrolysis and elucidates the roles of metals within HEOs.

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【要点】：本研究提出了一种通过调控多种3d轨道实现高熵氧化物在海水中自平衡效应的新策略，显著提高了电解海水的性能。

【方法】：通过简单的合成方法制备了FeNiCoMnCr高熵氧化物（HEO），利用过渡金属的3d轨道强耦合效应调节催化剂电子结构。

【实验】：在碱性海水中，通过实验验证了所制备的HEO催化剂在氧气析出反应中表现出的高活性和稳定性，数据集未在文中明确提及。