催化作用
兴奋剂
材料科学
电化学
锰
氧化物
纳米线
氧化锰
燃料电池
氧气
密度泛函理论
金属
纳米技术
热液循环
氧还原反应
化学工程
物理化学
电极
计算化学
化学
光电子学
冶金
有机化学
工程类
作者
Zixu Wu,Guangxing Li,Qin Liao,Ruida Ding,Xuze Zuo,Qilin Liu,Hao He,Shuguang Chen
出处
期刊:NANO
[World Scientific]
日期:2020-09-01
卷期号:15 (09): 2050115-2050115
被引量:4
标识
DOI:10.1142/s1793292020501155
摘要
Enhancing the catalytic activity of manganese oxide in oxygen reduction reaction (ORR) is a key issue for its large-scale application in metal-air fuel cells. Ag-doped [Formula: see text]-MnO 2 nanowires without Ag or Ag 2 O have been successfully synthesized via a facile hydrothermal method, and the changes in both the structure and electrochemical catalytic performances after Ag doping are investigated. Compared with the pristine [Formula: see text]-MnO 2 , the as-prepared Ag-doped MnO 2 exhibits a significantly enhanced catalytic activity in both ORR and Mg-air fuel cell application. With Ag/Mn ratio of 1:25, Ag-doped MnO 2 exhibits a typical 4e-reaction pathway and presents a 163 mV higher half-wave potential than that of the pristine [Formula: see text]-MnO 2 . Furthermore, it demonstrates a power density of 75.1[Formula: see text]mW[Formula: see text]cm[Formula: see text] at current density of 134.5[Formula: see text]mA[Formula: see text]cm[Formula: see text] in the Mg-air fuel cells. The enhanced ORR performances are considered to be contributed from the activation of surface lattice oxygen, the improvement in conductivity and the increase in oxygen vacancies of [Formula: see text]-MnO 2 . These findings provide new understanding for developing high-performance manganese oxide catalysts.
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