期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 681, 期 -, 页码 293-300出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.04.227
关键词
Amorphous activated carbon; MnO2 nanostructure; Composites; Microwave irradiation; Electrochemical capacitor; Energy storage
资金
- South African Research Chairs Initiative (SARChI) of the Department of Science and Technology
- National Research Foundation (NRF) of South Africa [97994]
- NRF through SARChI Chair in Carbon Technology and Materials
- University of Pretoria
The green chemistry route (microwave) was used to produce nanocomposite materials based on activated carbon (AC) and manganese (Mn) oxide nanostructures. XRD analysis revealed that amorphous and crystalline oxide structures were synthesized. Scanning electron microscopy studies revealed rodlike alpha-MnO2 for the pristine sample, while cubic Mn3O4 and irregularly shaped MnO2 structures anchored on the AC substrate, with the nanostructures being uniformly distributed on the AC. The electrochemical tests of the composites as electrodes showed that the amorphous AC-MnO2 had a specific capacitance of 180 F g(-1), nearly four times higher than that of the crystalline AC-Mn3O4 composite electrode (55 F g(-1)). The coulombic efficiency for the AC-MnO2 cell was 98% after 5000 cycles, indicating only a small loss of capacitance. The green route technique and good electrochemical properties indicate that the amorphous AC-MnO2 nanocomposite could be a good material for high-capacity, low-cost, and environmentally friendly electrodes for electrochemical capacitors. Crown Copyright (C) 2016 Published by Elsevier B.V. All rights reserved.
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