Atomic-level insight into reasonable design of metal-based catalysts for hydrogen oxidation in alkaline electrolytes,Energy & Environmental Science

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Atomic-level insight into reasonable design of metal-based catalysts for hydrogen oxidation in alkaline electrolytes
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2021-1-8 , DOI: 10.1039/d0ee03609a
Lulu An _{1,

2,

3,

4,

5} , Xu Zhao _{1,

2,

3,

4,

5} , Tonghui Zhao _{1,

2,

3,

4,

5} , Deli Wang _{1,

2,

3,

4,

5}

Affiliation

Anion exchange membrane fuel cells (AEMFCs) are becoming highly attractive for hydrogen utilization owing to the advantages of employing economic catalysts in alkaline electrolytes. Nevertheless, the kinetics of the anodic hydrogen oxidation reaction (HOR) in alkaline electrolytes, even catalyzed by the state-of-the-art Pt catalysts, is two orders of magnitude lower than that in acidic systems. Accordingly, developing highly efficient electrocatalysts for the HOR in alkaline electrolytes becomes fundamentally important and especially urgent. Here, the reaction mechanism of the HOR under alkaline conditions is briefly presented as the prerequisite for investigating catalysts towards the alkaline HOR. Meanwhile, the critical roles of the atomic coordination configuration, atomic stacking behaviors and atomic arrangement of metal-based catalysts in catalyzing the HOR under alkaline conditions are systematically discussed to provide atomic-level understanding for the development of HOR catalysts. Furthermore, potential synthesis methods of metal-based catalysts with well-confined structures are illustrated. Finally, the remaining challenges and promising avenues for efficiently developing catalysts towards the alkaline HOR are highlighted for future studies in this field.

中文翻译：

原子级洞察力，研究碱性电解液中氢氧化的金属基催化剂的合理设计

由于在碱性电解质中使用经济型催化剂的优势，阴离子交换膜燃料电池（AEMFC）对于氢的利用正变得越来越有吸引力。然而，即使在最先进的Pt催化剂的催化下，碱性电解质中的阳极氢氧化反应（HOR）的动力学也比酸性体系中的动力学低两个数量级。因此，开发用于碱性电解质中的HOR的高效电催化剂从根本上是重要的，并且尤其是紧迫的。在此，简要介绍了HOR在碱性条件下的反应机理，这是研究催化剂向碱性HOR转化的前提。同时，原子配位结构的关键作用本文系统地讨论了碱性条件下金属基催化剂催化HOR的原子堆积行为和原子排列，为HOR催化剂的开发提供了原子层次的理解。此外，说明了具有良好约束结构的金属基催化剂的潜在合成方法。最后，有效开发面向碱性HOR的催化剂的剩余挑战和有前途的途径在该领域的未来研究中得到了强调。

更新日期：2021-01-28

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