期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 17, 期 36, 页码 23496-23502出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5cp03375f
关键词
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资金
- Energy Efficiency and Resources of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Ministry of Trade, Industry and Energy Republic of Korea [2011201010016C]
- Korea Institute of Science and Technology (KIST) Institutional Program [2E25304]
A ZnO-MnO composite was synthesized using a simple solvothermal method combined with a high-temperature treatment. To observe the phase change during the heating process, in situ high-temperature XRD analysis was performed under vacuum conditions. The results indicated that ZnMn2O4 transformed into the ZnO-MnO composite phase starting from 500 degrees C and that this composite structure was retained until 700 degrees C. The electrochemical performances of the ZnO-MnO composite electrode were evaluated through galvanostatic discharge-charge tests and cyclic voltammetry analysis. Its initial coulombic efficiency was significantly improved to 68.3% compared to that of ZnMn2O4 at 54.7%. Furthermore, the ZnO-MnO composite exhibited improved cycling performance and enhanced rate capability compared with untreated ZnMn2O4. To clarify the discharge-charge mechanism of the ZnO-MnO composite electrode, the structural changes during the charge and discharge processes were also investigated using ex situ XRD and TEM.
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