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Flexible Pillared Graphene‐Paper Electrodes for High‐Performance Electrochemical Supercapacitors
Author(s) -
Wang Gongkai,
Sun Xiang,
Lu Fengyuan,
Sun Hongtao,
Yu Mingpeng,
Jiang Weilin,
Liu Changsheng,
Lian Jie
Publication year - 2012
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201101719
Subject(s) - supercapacitor , graphene , materials science , capacitance , horizontal scan rate , electrolyte , electrochemistry , electrode , nanoparticle , chemical engineering , nanotechnology , aqueous solution , energy storage , cyclic voltammetry , chemistry , organic chemistry , power (physics) , physics , quantum mechanics , engineering
Flexible graphene paper (GP) pillared by carbon black (CB) nanoparticles using a simple vacuum filtration method is developed as a high‐performance electrode material for supercapacitors. Through the introduction of CB nanoparticles as spacers, the self‐restacking of graphene sheets during the filtration process is mitigated to a great extent. The pillared GP‐based supercapacitors exhibit excellent electrochemical performances and cyclic stabilities compared with GP without the addition of CB nanoparticles. At a scan rate of 10 mV s −1 , the specific capacitance of the pillared GP is 138 F g −1 and 83.2 F g −1 with negligible 3.85% and 4.35% capacitance degradation after 2000 cycles in aqueous and organic electrolytes, respectively. At an extremely fast scan rate of 500 mV s −1 , the specific capacitance can reach 80 F g −1 in aqueous electrolyte. No binder is needed for assembling the supercapacitor cells and the pillared GP itself may serve as a current collector due to its intrinsic high electrical conductivity. The pillared GP has great potential in the development of promising flexible and ultralight‐weight supercapacitors for electrochemical energy storage.