期刊
CERAMICS INTERNATIONAL
卷 40, 期 1, 页码 2115-2120出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2013.07.127
关键词
Nanocomposites; Electrodes; CoAl-LDH; MnO2; Supercapacitors
资金
- National Natural Science Foundation of China [51104194]
- Doctoral Fund of Ministry of Education of China [20110191120014]
- No. 43 Scientific Research Foundation for the Retained Overseas Chinese Scholars, State Education Ministry
- Fundamental Research Funds for the Central Universities [CDJZR12248801, CDJZR12135501]
- Chongqing University
In this work, MnO2/CoAl-layered double hydroxide (CoAl-LDH) nanocomposites were prepared through a simple redox reaction between Co-2 species and MnO4-. The structure and morphology of these nanocomposites were investigated by powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), focused ion beam scanning electron microscopy (FIB/SEM) and high-resolution transmission electron microscopy (HRTEM). CoAl-LDH/MnO2 nanocomposites presented their platelet-like structures with MnO2 nanocrystals decorating the LDH host layer. Furthermore, the electrochemical properties of composites were evaluated by cycle voltammetric (CV) and galvanostatic charge-discharge measurements. Surprisingly, the hierarchical CoAl-LDH/MnO2 composites displayed a high specific capacitance (1088 F g(-1) at 1 A g(-1)), high rate capability, and excellent long-term cycling life. In principle, these findings suggested that CoAl LDHs-based nanocomposites could be promising candidates for supercapacitors electrode with enhancive electrochemical behavior. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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