期刊
ELECTROCHIMICA ACTA
卷 305, 期 -, 页码 360-369出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.03.062
关键词
Silver-manganese dioxide nanotube; Specific surface area; Synergetic effect; Oxygen reduction reaction; Aluminum-air batteries
资金
- Science and Technology Ministry of China (863 project) [2012AA062302]
Overcoming slow kinetics of cathodic electrochemical reactions is a key factor toward achieving economical and efficient electrocatalysts for practical application of primary Al-air batteries. In this study, a hybrid catalyst with specific surface area and manganese valence controlled alpha-MnO2 nanotube decorated by silver nanoparticles (Ag/MnO2-3) is successful synthesized. A facile hydrothermal method was used, followed by liquid phase reducing treatment. The Ag/MnO2-3 showed not only superior catalytic activity for the oxygen reduction reaction with more positive onset potential (0.996 V vs. RHE) and comparable half-wave potential (0.870 V vs. RHE) to the commercial Pt/C catalyst but also a higher discharge voltage plateau (similar to 1.1 V at discharge current density of 50 mA cm(-2)) with superior stability in the primary Al-air battery test. The high electrocatalytic activity of the Ag/MnO2-3 nanohybrid is attributed to the larger specific surface area of MnO2 nanotubes and its ultrahigh atomic ratios of Mn3+/Mn4+ on the surface. This results in a strong synergistic effect between manganese dioxide nanotube and Ag nanoparticles to inhibit the accumulation of hydrogen peroxide. This material is promising for applications in Al-air batteries. (C) 2019 Elsevier Ltd. All rights reserved.
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