Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/32710
Title: Improved performance of asymmetric fiber-based micro-supercapacitors using carbon nanoparticles for flexible energy storage
Authors: Jin, H
Zhou, L 
Mak, CL 
Huang, H 
Tang, WM 
Chan, HLW 
Issue Date: 2015
Publisher: Royal Society of Chemistry
Source: Journal of materials chemistry A, 2015, v. 3, no. 30, p. 15633-15641 How to cite?
Journal: Journal of materials chemistry A 
Abstract: Recently, high-performance energy storage devices are urgently needed due to the rapid development of miniaturized, portable and wearable electronic equipment. However, most of the single-cell energy storage devices suffer from a relatively low operating voltage. In this work, we present a novel fiber-based micro-asymmetric supercapacitor (ASC) with high performance and good integration ability. A carbon nanoparticle coated carbon fiber (CF@CNPs) is chosen as the substrate owing to its notable features such as high porosity, high flexibility, lightweight, simple processing and ease of integration. A manganese oxide nanosheet grown on CF@CNPs and functionalized CF@CNPs are employed as the positive and negative electrode of the micro-ASC, respectively. The as-prepared ASC device can operate at 1.8 V and exhibit a high volumetric energy density of 2.1 mW h cm-3, which is comparable to that of a thin-film Li-battery. Furthermore, the micro-ASC can achieve a very high capacitance retention of about 82.7% when the charge and discharge current density is changed from 0.25 A cm-3 to 6.3 A cm-3, demonstrating the excellent rate capability of the ASC. The ASC also shows good cycling stability and has great potential for integration with energy harvesting devices to realize highly efficient self-powered systems.
URI: http://hdl.handle.net/10397/32710
ISSN: 2050-7488
EISSN: 2050-7496
DOI: 10.1039/c5ta03576g
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