Epitaxially Grown Heterostructured SrMn3O6-x-SrMnO3 with High-Valence Mn3+/4+ for Improved Oxygen Reduction Catalysis
Epitaxially Grown Heterostructured SrMn3O6-x-SrMnO3 with High-Valence Mn3+/4+ for Improved Oxygen Reduction Catalysis
复制标题
具有高价 Mn3 /4 的外延生长异质结构 SrMn3O6-x-SrMnO3 用于改进氧还原催化
DOI：
10.1002/anie.202109207
复制
发表时间：
2021-08-26
影响因子：
16.6
通讯作者：
Liu, Zhao-Qing
中科院分区：
文献类型：
--
作者：
Chen, Cheng;Wang, Xiao-Tong;Liu, Zhao-Qing
Heterostructured catalysts show outstanding performance in electrochemical reactions owing to their beneficial interfacial properties. However, the rational design of heterostructured catalysts with the desired interfacial properties and charge-transfer characteristics is challenging. Herein, we developed a SrMn3O6-x-SrMnO3 (SMOx-SMO) heterostructure through epitaxial growth, which demonstrated excellent electrocatalyst performance for the oxygen reduction reaction (ORR). The formation of high-valence Mn3+/4+ is beneficial for promoting a positive shift in the position of the d-band center, thereby optimizing the adsorption and desorption of ORR intermediates on the heterojunction surface and resulting in improved catalytic activity. When SMOx-SMO was applied as an air-electrode catalyst in a rechargeable zinc-air battery, a high output voltage and power density was achieved, with performance comparable to a battery prepared with Pt/C-IrO2 air-electrode catalysts, albeit with much better cycling stability.
