| Autor: |
Wu, Zixu, Li, Guangxing, Liao, Qin, Ding, Ruida, Zuo, Xuze, Liu, Qilin, He, Hao, Chen, Shuguang |
| Předmět: |
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| Zdroj: |
NANO; Sep2020, Vol. 15 Issue 9, pN.PAG-N.PAG, 10p |
| Abstrakt: |
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 α -MnO2 nanowires without Ag or Ag2O 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 α -MnO2, the as-prepared Ag-doped MnO2 exhibits a significantly enhanced catalytic activity in both ORR and Mg-air fuel cell application. With Ag/Mn ratio of 1:25, Ag-doped MnO2 exhibits a typical 4e-reaction pathway and presents a 163 mV higher half-wave potential than that of the pristine α -MnO2. Furthermore, it demonstrates a power density of 75.1 mW cm − 2 at current density of 134.5 mA cm − 2 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 α -MnO2. These findings provide new understanding for developing high-performance manganese oxide catalysts. A facile hydrothermal route is carried out to synthesize Ag-doped α-MnO2 nanowire, which shows excellent oxygen reduction activity owing to the enhancement in the overall electrical conductivity as well as the increase in the oxygen vacancies. The good performance of Ag-doped nanowire indicates its promising application in Mg-air fuel cell. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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