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Molecular Nature of Electrodeposits in Electrochemical Water Oxidation
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2023-05-18 , DOI: 10.1002/aenm.202300896
Hussein A. Younus 1, 2 , Nazir Ahmad 3 , Mohammed Al‐Abri 1, 4 , Rashid Al‐Hajri 4 , Shiguo Zhang 5
Affiliation  

The molecular nature and the structure of the real catalyst are matters of serious concern in homogeneous catalysis. Catalyst transformation in molecular water oxidation catalysis (WOC) is usually linked to catalyst decomposition with the generation of nanostructured materials. This is mainly due to the operational conditions that are conducive for the formation of metal oxides (MOx), which have a strong affinity for adsorbing onto the electrodes’ surfaces. Recently, the exhibition of the molecular nature of the electrodeposits rather than MOx is a breakthrough in the field of WOC, suggesting that deposits in electrocatalysis are not constrained to metal oxides/hydroxides after molecular catalyst decomposition. Therefore, several points should be considered before deciding whether the deposits are aggregates of a molecular structure or simple metal oxides formed due to the decomposition of the original structure. Thus, the aim of this perspective is to showcase the examples of homogeneous WOCs where metal–organic species are electrodeposited instead of metal oxide-based catalysts. The transformation of heterogenized molecular catalysts for WO into a more electroactive form while preserving their molecular identity, is also discussed. This summary provides an overview of the molecular nature of electrodeposits, how to identify their presence and decide about their nature.

中文翻译:

电化学水氧化中电沉积物的分子性质

真实催化剂的分子性质和结构是均相催化中备受关注的问题。分子水氧化催化(WOC)中的催化剂转化通常与催化剂分解和纳米结构材料的生成相关。这主要是由于有利于金属氧化物(MO x)形成的操作条件,金属氧化物对电极表面的吸附具有很强的亲和力。最近,展示了电沉积物的分子性质而不是MO x这是WOC领域的一项突破,表明电催化中的沉积物在分子催化剂分解后不再局限于金属氧化物/氢氧化物。因此,在确定沉积物是分子结构的聚集体还是由于原始结构分解而形成的简单金属氧化物之前,应考虑以下几点。因此,这个观点的目的是展示均相WOC的例子,其中金属有机物是电沉积的,而不是基于金属氧化物的催化剂。还讨论了将 WO 多相分子催化剂转化为更具电活性的形式,同时保留其分子特性。本摘要概述了电沉积的分子性质、如何识别其存在并确定其性质。
更新日期:2023-05-18
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