摘要
Manganese oxides are a promising class of electrocatalysts for renewable energy devices,such as fuel cells.Mn(Ⅲ) ions with e_(g) electron filling of-1 are the active sites for manganese-based electrocatalysts.However,Mn(Ⅲ) sites may be disproportionated during electrochemical reactions,thus reducing the number of Mn(Ⅲ) active sites and decreasing the catalytic activity of manganese oxides.In this work,we developed a facile cyclic voltammetry method to monitor the evolution of Mn(Ⅲ) sites on a series of manganese oxides under "working" conditions.We proposed a descriptor S_(Mn(Ⅲ)) to describe the stability of Mn(Ⅲ).Our simulated and experimental results show that the higher is S_(Mn(Ⅲ)),the higher the active Mn(Ⅲ)density,and the higher the electrocatalytic activity of the manganese oxide electrocatalyst.
基金
supported by the National Natu-ral Science Foundation of China(Nos.52071231,51722103)
the Natural Science Foundation of Tianjin(19JCJQJC61900).
作者简介
Jisi Li,received her Master’s degree in 2021 from the School of Materials Science and Engi-neering,Tianjin University,China,and is currently a Ph.D.candidate there under the super-vision of Prof.Tao Ling.Her research interest focuses on engi-neering novel metal oxide-based catalysts for the applications on electrocatalysis and clean energy conversion devices,lijisi@tju.edu.cn;Tao Ling,received her Ph.D.degree in Materials Science and Engineering from Tsinghua Uni-versity,China,in 2009.Now,she is a professor in School of Mate-rials Science and Engineering,Tianjin University,China.Her research focuses on the develop-ment of new catalytic materials for sustainable clean energy gen-eration and conversion(electro-catalysis,photocatalysis,and photoelectrocatalysis).lingt04@tju.edu.cn。
