Dynamic Cation Intercalation Facilitating Chemical Oxidation of Water and Surface Stabilization During the Oxygen Evolution Reaction,Energy & Environmental Materials

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Dynamic Cation Intercalation Facilitating Chemical Oxidation of Water and Surface Stabilization During the Oxygen Evolution Reaction
Energy & Environmental Materials ( IF 13.0 ) Pub Date : 2024-08-01 , DOI: 10.1002/eem2.12813
Huiyan Zeng ₁ , Zhongfei Liu ₁ , Jun Qi ₁ , Jiajun Chen ₁ , Yanquan Zeng ₁ , Chengyan Yang ₁ , Zhenzhong Li _{1,

2} , Chao Wang ₁ , Long Gu ₁ , Yan Zhang ₃ , Miao Shu ₂ , Chunzhen Yang _{1,

2}

Affiliation

A comprehensive understanding of the dynamic processes at the catalyst/electrolyte interfaces is crucial for the development of advanced electrocatalysts for the oxygen evolution reaction (OER). However, the chemical processes related to surface corrosion and catalyst degradation have not been well understood so far. In this study, we employ LiCoO₂ as a model catalyst and observe distinct OER activities and surface stabilities in different alkaline solutions. Operando X-ray diffraction (XRD) and online mass spectroscopy (OMS) measurements prove the selective intercalation of alkali cations into the layered structure of LiCoO₂ during OER. It is proposed that the dynamic cation intercalations facilitate the chemical oxidation process between highly oxidative Co species and adsorbed water molecules, triggering the so-called electrochemical-chemical reaction mechanism (EC-mechanism). The results of this study emphasize the influence of cations on OER and provide insights into new strategies for achieving both high activity and stability in high-performance OER catalysts.

中文翻译：

动态阳离子插层促进析氧反应过程中水的化学氧化和表面稳定

全面了解催化剂/电解质界面的动态过程对于开发用于析氧反应（OER）的先进电催化剂至关重要。然而，迄今为止，与表面腐蚀和催化剂降解相关的化学过程尚未得到很好的了解。在本研究中，我们采用LiCoO ₂作为模型催化剂，观察不同碱性溶液中不同的OER活性和表面稳定性。原位X射线衍射（XRD）和在线质谱（OMS）测量证明了OER过程中碱金属阳离子选择性嵌入LiCoO ₂的层状结构中。有人提出，动态阳离子插层促进了高氧化性Co物种和吸附水分子之间的化学氧化过程，引发了所谓的电化学化学反应机制（EC机制）。这项研究的结果强调了阳离子对 OER 的影响，并为在高性能 OER 催化剂中实现高活性和稳定性的新策略提供了见解。

更新日期：2024-08-01

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