<br>原子级水分解电催化剂结构与性能的关系,Small

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原子级水分解电催化剂结构与性能的关系
Small ( IF 13.0 ) Pub Date : 2023-08-06 , DOI: 10.1002/smll.202304560
Jungsue Choi ₁ , Sohyeon Seo _{1,

2} , Minsu Kim ₁ , Yeonsu Han ₁ , Xiaodong Shao ₁ , Hyoyoung Lee _{1,

2,

3,

4}

Affiliation

原子级电催化剂极大地提高了水分解的性能和效率，但需要对支撑结构进行特殊调整以锚定和分散金属单原子。在此，根据不同的合成方法和结构特性，回顾了用于水分解的原子级电催化剂的结构演变，这些为电催化活性创造了不同的环境。氢或氧析出反应的速率决定步骤或中间态通过支撑材料的单原子活性位点的配位环境在能量上稳定。在大规模实际使用中，最大化金属单原子的负载量可以提高电催化剂的效率并降低经济成本。具有两个不同单原子活性位点的双原子电催化剂与数量增加的水分子发生反应，并降低由两个金属原子之间的电负性差异产生的水吸附能。特别地，单原子二聚体诱导不对称活性位点，促进H ₂ O降解为H ₂或O ₂演化。因此，原子级电催化剂的结构特性阐明了催化活性位点和支撑材料之间的原子相互关系，以实现最大效率。

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Relationship between Structure and Performance of Atomic-Scale Electrocatalysts for Water Splitting

Atomic-scale electrocatalysts greatly improve the performance and efficiency of water splitting but require special adjustments of the supporting structures for anchoring and dispersing metal single atoms. Here, the structural evolution of atomic-scale electrocatalysts for water splitting is reviewed based on different synthetic methods and structural properties that create different environments for electrocatalytic activity. The rate-determining step or intermediate state for hydrogen or oxygen evolution reactions is energetically stabilized by the coordination environment to the single-atom active site from the supporting material. In large-scale practical use, maximizing the loading amount of metal single atoms increases the efficiency of the electrocatalyst and reduces the economic cost. Dual-atom electrocatalysts with two different single-atom active sites react with an increased number of water molecules and reduce the adsorption energy of water derived from the difference in electronegativity between the two metal atoms. In particular, single-atom dimers induce asymmetric active sites that promote the degradation of H₂O to H₂ or O₂ evolution. Consequently, the structural properties of atomic-scale electrocatalysts clarify the atomic interrelation between the catalytic active sites and the supporting material to achieve maximum efficiency.

更新日期：2023-08-06

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