LaSr_2Mn_2O_7 Ruddlesden-Popper manganites for oxygen reduction and electrochemical capacitors

作     者：Qin Li Meitian Guo Kaiyuan Wang Zhiqiang Wei Guoping Du Guoguang Zhang Nan Chen Qin Li;Meitian Guo;Kaiyuan Wang;Zhiqiang Wei;Guoping Du;Guoguang Zhang;Nan Chen

作者机构：School of Materials Science and EngineeringNanchang UniversityNanchang 330031China School of Materials Science and EngineeringNanchang Hangkong UniversityNanchang 330063China 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2020年第38卷第7期

页      面：763-769,I0003页

核心收录：

学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 

基　　金：Project supported by National Natural Science Foundation of China (21571095 61366004) 

主　　题：LaSr2Mn2O7 Oxygen reduction reaction Electrochemical capacitor Rare earths 

摘      要：LaSr2 Mn2 O7,a Ruddlesden-Popper type bilayered perovskite,was investigated as oxygen catalyst for oxygen reduction reaction(ORR) and active electrode material for electrochemical capacitors in KOH *** results show that Mn takes a mixed Mn2+,Mn3+and Mn4+valence state with an average valence of *** catalyst towards ORR,LaSr2 Mn2 O7 and LaSr2 Mn2 O7/acetylene black composite favor four electron pathways for ***2 Mn2 O7/C composite shows a comparable onset potential for ORR to that of Pt/C *** improved ORR activity of LaSr2 Mn2 O7/acetylene black composite is attributed to the synergy between catalytic LaSr2 Mn2 O7 and conductive acetylene *** electrode material for electrochemical capacitors,LaSr2 Mn2 O7 exhibits a maximum specific capacitance of 167.2 F/g with 62%faradic contribution at a scan rate of 1 mV/s in cyclic voltammetry test.