Dynamic shrinkage of metal-oxygen bonds in atomic Co-doped nanoporous RuO2 for acidic oxygen evolution
Dynamic shrinkage of metal-oxygen bonds in atomic Co-doped nanoporous RuO2 for acidic oxygen evolution
复制标题
DOI：
10.1007/s40843-021-1912-8
复制
发表时间：
2022-01
期刊：
影响因子：
--
通讯作者：
Qiuli Wu;Kang Jiang;Jiuhui Han;Dechao Chen;M. Luo;J. Lan;Ming Peng;Yongwen Tan
中科院分区：
文献类型：
--
作者：
Qiuli Wu;Kang Jiang;Jiuhui Han;Dechao Chen;M. Luo;J. Lan;Ming Peng;Yongwen Tan
酸性介质中高活性、高稳定性的析氧反应催化剂的设计已成为能量转换和储存技术发展的一个重要研究方向。然而，在这一领域的进展一直受到限制，在现实的OER条件下的催化剂的动态活性结构的认识不足。本文通过对纳米孔Co-Ru合金进行退火和刻蚀，制备了一种在酸性条件下具有良好OER活性和稳定性的原子Co掺杂纳米孔RuO 2电催化剂，X射线吸收光谱分析结果证实，刻蚀策略在原子Co掺杂纳米孔RuO 2电催化剂的金属中心周围产生了丰富的氧空位.这些空缺产生收缩的金属-氧配体键在现实的OER条件下。合成的电催化剂的动态结构演变使它们在OER催化过程中经历较低的动力学势垒，从而增强催化活性和稳定性。这项研究还提供了原子细节的活性结构的电催化剂和它们的结构演变对OER活性的影响。
The design of highly active and stable catalysts for the oxygen evolution reaction (OER) in acidic media has become an attractive research area for the development of energy conversion and storage technologies. However, progress in this area has been limited by the poor understanding of the dynamic active structure of catalysts under realistic OER conditions. Here, an atomic Co-doped nanoporous RuO2electrocatalyst, which exhibited excellent OER activity and stability in acidic conditions, was synthesized through annealing and etching of a nanoporous Co-Ru alloy.OperandoX-ray absorption spectroscopy results confirmed that the etching strategy produced abundant oxygen vacancies around the metal centers in the atomic Co-doped nanoporous RuO2electrocatalyst. These vacancies created contracted metal-oxygen ligand bonds under realistic OER conditions. The dynamic structural evolution of the synthesized electrocatalyst allowed them to experience lower kinetic barriers during OER catalysis, resulting in enhanced catalytic activity and stability. This study also provided atomic details on the active structure of the electrocatalyst and the influence of their structural evolution on OER activity.