Hydrogen oxidation reaction (HOR) can effectively convert the hydrogen energy through the hydrogen fuel cells, which plays an increasingly important role in the renewable hydrogen cycle. Nevertheless, when the electrolyte pH changes from acid to base, even with platinum group metal (PGM) catalysts, the HOR kinetics declines with several orders of magnitude. More critically, the pivotal role of reaction intermediates and interfacial environment during intermediate behaviors on alkaline HOR remains controversial. Therefore, exploring the exceptional PGM‐based alkaline HOR electrocatalysts and identifying the reaction mechanism are indispensable for promoting the commercial development of hydrogen fuel cells. Consequently, the fundamental understanding of the HOR mechanism is first introduced, with emphases on the adsorption/desorption process of distinct reactive intermediates and the interfacial structure during catalytic process. Subsequently, with the guidance of reaction mechanism, the latest advances in the rational design of advanced PGM‐based (Pt, Pd, Ir, Ru, Rh‐based) alkaline HOR catalysts are discussed, focusing on the correlation between the intermediate behaviors and the electrocatalytic performance. Finally, given that the challenges standing in the development of the alkaline HOR, the prospect for the rational catalysts design and thorough mechanism investigation towards alkaline HOR are emphatically proposed.

中文翻译：

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铂族金属基碱性氢氧化催化剂的中间行为和设计策略


氢氧化反应 （HOR） 可以通过氢燃料电池有效地转化氢能，在可再生氢循环中发挥着越来越重要的作用。然而，当电解质 pH 值从酸变为碱时，即使使用铂族金属 （PGM） 催化剂，HOR 动力学也会下降几个数量级。更关键的是，反应中间体和界面环境在碱性 HOR 的中间行为中的关键作用仍然存在争议。因此，探索特殊的 PGM 基碱性 HOR 电催化剂并识别反应机理对于推动氢燃料电池的商业化发展是必不可少的。因此，首先介绍了对 HOR 机理的基本理解，重点介绍了不同反应性中间体的吸附/解吸过程和催化过程中的界面结构。随后，以反应机理为指导，讨论了先进PGM基（Pt、Pd、Ir、Ru、Rh基）碱性HOR催化剂合理设计的最新进展，重点介绍了中间行为与电催化性能之间的相关性。最后，鉴于碱性 HOR 开发中存在的挑战，重点提出了合理催化剂设计和对碱性 HOR 的彻底机理研究的前景。