Activated carbon fibers with manganese dioxide coating for flexible fiber supercapacitors with high capacitive performance

Fiber supercapacitor (FSC) is a promising power source for wearable/stretchable electronics and high capacitive performance of FSCs is highly desirable for practice flexible applications. Here, we report a composite of manganese dioxide (MnO2) and activated carbon fibers (ACFs) with high MnO2 mass loading and microporous structure (abbreviated as MnO2@ACF), which is used as a fiber electrode to produce a FSC with a high capacitive performance and a good flexibility. The MnO2@ACF composite electrode in FSCs delivers an ultrahigh specific capacitance of 410 mF/cm(2) at 0.1 mA/cm(2), corresponding to a high energy density of 36 mu Wh/cm(2) and high power density of 726 mu W/cm(2). Such high capacitive performance and simple fabrication method indicates that the MnO2@ACF composite is a very promising electrode material for flexible fiber supercapacitors. (C) 2018 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.