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引用次数: 0
摘要
本研究通过原位技术研究了镍铁（水合）氧化物的动态变化，并确定了高价铁在碱性介质中氧进化反应（OER）中的作用。研究发现，即使在 OER 发生 96 小时后，若干高价铁离子在镍铁（氢）氧化物中无电位的情况下仍相当稳定。对于用 57Fe 离子处理的 Ni2+ 氢氧化物（Fe 位点被引入 Ni2+ 氢氧化物表面），在速率决定步骤 (RDS) 中没有检测到 Fe4+ 物种。这项研究的结果表明，与镍离子类似，块状铁离子氧化成高价形式也是电荷积累，在 OER 中没有直接作用；这些结果为操纵铁离子状态以优化 OER 效能提供了一个新的视角。普遍的假设认为，微量的高价铁离子，特别是表面的铁离子，直接参与了 OER。
A Hypothesis on the Function of High-Valent Fe in NiFe (Hydr)oxide in the Oxygen-Evolution Reaction.
This study investigated the dynamic changes in NiFe (hydr)oxide and identified the role of high-valent Fe in the oxygen-evolution reaction (OER) within alkaline media via in-situ techniques. Several high-valent Fe ions were found to remain considerably stable in the absence of potential in NiFe (hydr)oxide, even 96 hours after the OER. For Ni2+ hydroxide treated with 57Fe ions, where Fe sites are introduced onto the surface of Ni2+ hydroxide, no Fe4+ species were detected at the rate-determining step (RDS). The findings of this study suggested that the oxidation of bulk Fe ions, similar to Ni ions, to high valent forms, is charge accumulation without a direct role in OER; these results offered a novel perspective on manipulating Fe states to optimize OER efficacy. The prevailing hypothesis suggested that trace amounts of high-valent Fe ions, notably those on the surface, directly participate in OER.
期刊介绍：
Angewandte Chemie, a journal of the German Chemical Society (GDCh), maintains a leading position among scholarly journals in general chemistry with an impressive Impact Factor of 16.6 (2022 Journal Citation Reports, Clarivate, 2023). Published weekly in a reader-friendly format, it features new articles almost every day. Established in 1887, Angewandte Chemie is a prominent chemistry journal, offering a dynamic blend of Review-type articles, Highlights, Communications, and Research Articles on a weekly basis, making it unique in the field.
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