High-performance free-standing composite electrodes for supercapacitors were constructed with activated carbon fiber cloth substrate loaded with MnO2,carbon nanotube and polyaniline.Composition,morphology and their effects on the electrochemical performance of the composite electrodes were well-studied.It turned out that the electrochemically active materials,including activated carbon fiber cloth,MnO2 and polyaniline were uniformly distributed inside the composite electrode.And the activated carbon fiber and carbon nanotube served as electrically conductive networks.The specific capacitance of the electrode can reach 193F/g based on the total mass of the electrode,which was significantly higher than pure activated carbon cloth,activated carbon cloth/polyaniline composite electrode and many other composite electrodes.Besides,the composite electrode exhibited excellent rate capability and cyclic stability.This work proposed a facile method for the preparation of composite electrode and offered a new scope for optimizing the distribution of electrochemically active materials and electrode structure for high energy storage density supercapacitors.
[1] Dong L B,Xu C J,Li Y,et al.Flexible electrodes and supercapacitors for wearable energy storage:a review by category[J].J Mater Chem A,2016,4 (13):4659-4685.
[2] 余丽丽,朱俊杰,赵景泰.超级电容器的现状及发展趋势[J].自然杂志,2015,37 (3):188-196.
[3] Zhang G Q,Wu H B,Hoster H E,et al.Single-crystalline NiCo2O4 nanoneedle arrays grown on conductive substrates as binder-free electrodes for high-performance supercapacitors[J].Energy Environ Sci,2012,5 (11):9453-9456.
[4] Chou S L,Wang J Z,Chew S Y,et al.Electrodeposition of MnO2 nanowires on carbon nanotube paper as free-standing,flexible electrode for supercapacitors[J].Electro Chem Commun,2008,10 (11):1724-1727.
[5] Wang S Y,Dryfe R A W.Graphene oxide-assisted deposition of carbon nanotubes on carbon cloth as advanced binder-free electrodes for flexible supercapacitors[J].J Mater Chem A,2013,1 (17):5279-5283.
[6] Tao J Y,Liu N S,Rao J Y,et al.Series asymmetric supercapacitors based on free-standing inner-connection electrodes for high energy density and high output voltage[J].Nanoscale,2014,6 (24):15073-15079.
[7] Li X J,Song Z W,Guo W,et al.Vertically porous Ni (OH)2/Ni thin film on carbon cloth for high performance flexible supercapacitors[J].Mater Lett,2017,190:20-23.
[8] Yang P H,Li Y Z,Lin Z Y,et al.Worm-like amorphous MnO2 nanowires grown on textiles for high-performance flexible supercapacitors[J].J Mater Chem A,2014,2 (3):595-599.
[9] Biniak S,Dzielendziak B,Siedlewski J.The electrochemical behaviour of carbon fibre electrodes in various electrolytes.double-layer capacitance[J].Carbon,1995,33 (9):1255-1263.
[10] Dong L B,Xu C J,Yang Q,et al.High-performance compressible supercapacitors based on functionally synergic multiscale carbon composite textiles[J].J Mater Chem A,2015,3 (8):4729-4737.
[11] Xu B,Wu F,Chen S,et al.Activated carbon fiber cloths as electrodes for high performance electric double layer capacitors[J].Electrochimica Acta 2007,52 (13):4595-4598.
[12] 陈秋飞,张学军,田艳红.沥青基活性碳纤维的电容特性[J].北京化工大学学报,2008,35 (2):55-59.
[13] Dong L B,Xu C J,Li Y,et al.Simultaneous production of high-performance flexible textile electrodes and fiber electrodes for wearable energy storage[J].Adv Mater,2016,28 (8):1675-1681.
[14] Hu L B,Pasta M,Mantia F L,et al.Stretchable,porous,and conductive energy textiles[J].Nano Lett,2010,10 (2):708-714.
[15] Dong L B,Liang G M,Xu C J,et al.Stacking up layers of polyaniline/carbon nanotube networks inside papers as highly flexible electrodes with large areal capacitance and superior rate capability[J].J Mater Chem A,2017,5 (37):19934-19942.
[16] Gupta V,Miura N.Influence of the microstructure on the supercapacitive behavior of polyaniline/single-wall carbon nanotube composites[J].J Power Sources,2006,157 (1):616-620.
[17] 李晶,赖延清,李颉,等.导电聚苯胺电极材料在超级电容器中的应用及研究进展[J].材料导报,2006,20 (12):20-23.
[18] 索陇宁,尚秀丽,伍家卫,等.聚苯胺纳米复合材料在超级电容器中的应用[J].化工新型材料,2014,42 (7):221-222.
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