PREPARATION AND CAPACITIVE BEHAVIOR OF DANDELION-LIKE γ-MnO2 NANOFIBRE/ACMB COMPOSITE FOR THE APPLICATION OF SUPERCAPACITOR

摘要

Currently, electrochemical supercapacitors are currently extensively studied as auxiliary energy storage devices to be used with rechargeable batteries. Their applications include electric vehicles, renewable energy, mobile generator devices, direct-current power systems, and uninterruptible power supplies [1]. Carbon microbeads have several advantages such as high electrically conductivity, good fluidity, excellent sphericity, easy to control pore size distribution and a relatively low cost [2]. Usually, the carbon materials only possess double layer capacitance, while metal oxide possess Faradic pseudo-capacitance, and the Faradic pseudo-capacitance is almost 10-100 times higher than double layer capacitance [3]. Recently, composite materials for supercapacitors have been widely developed, which are based on a combination of double layer capacitance and Faradic pseudo-capacitance [4]. With its low cost and environmental friendliness, manganese oxides with various structures, which are shown great potential for practical use, have been investigated intensively as electrode materials for supercapacitors [5]. In this paper, dandelion-like γ-MnO2 nanofibre/ACMB composites were prepared by an in situ coating method. The electrochemical performances of γ-MnO2 nanofibre/ACMB composite were investigated.