期刊
PARTICUOLOGY
卷 15, 期 -, 页码 34-38出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.partic.2012.12.006
关键词
MnO2; MWCNTs-OH; Supercapacitor; Non-noble metal electrocatalyst
资金
- National Basic Research Program of China (973 Project) [2012CB215502]
- National Natural Science Foundation of China [21003114, 21103163]
- National High Technology Research and Development Program of China (863 Project) [2011AA11A273]
The poor electrical conductivity of MnO2 limits its use as an electrode material. To overcome this limitation, we report an easy and rapid approach to deposit nanosized MnO2 onto multi-wall carbon nanotubes functionalized with hydroxyl groups (MWCNTs-OH) by chemical reduction of KMnO4 with MnSO4 in aqueous solution under ambient conditions. Characterization with XRD and TEM reveals that the obtained MnO2/MWCNTs-OH composite is nanocrystalline and partially covered by MnO2 nanosheets with a thickness of 1-3 nm at a MnO2 loading of 20 wt%. Cyclic voltammetry (CV) and galvanostatic charge-discharge measurements reveal that the MnO2/MWCNTs-OH composite with a MnO2 loading of 20 wt% has a relatively high specific capacitance of 234 F/g at a scan rate of 2 mV/s and exhibits good cycling stability. Furthermore, the oxygen reduction reaction (ORR) shows that MnO2/MWCNTs-OH composite may have potential applications as a non-noble metal electrocatalyst in fuel cells and metal-air batteries. (C) 2013 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
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