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Pushing the Cycling Stability Limit of Polypyrrole for Supercapacitors
Author(s) -
Song Yu,
Liu TianYu,
Xu XinXin,
Feng DongYang,
Li Yat,
Liu XiaoXia
Publication year - 2015
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201501709
Subject(s) - polypyrrole , materials science , pseudocapacitor , supercapacitor , electrode , capacitance , dopant , anode , chemical engineering , substrate (aquarium) , saturated calomel electrode , conductive polymer , doping , nanotechnology , composite material , electrolyte , polymer , optoelectronics , polymerization , reference electrode , chemistry , engineering , oceanography , geology
Polypyrrole (PPy) is a promising pseudocapacitive material for supercapacitor electrodes. However, its poor cycling stability is the major hurdle for its practical applications. Here a two‐prong strategy is demonstrated to stabilize PPy film by growing it on a functionalized partial‐exfoliated graphite (FEG) substrate and doping it with β ‐naphthalene sulfonate anions (NS − ). The PPy electrode achieves a remarkable capacitance retention rate of 97.5% after cycling between −0.8 and 0 V versus saturated calomel electrode for 10 000 cycles. Moreover, an asymmetric pseudocapacitor using the stabilized PPy film as anode also retains 97% of capacitance after 10 000 cycles, which is the best value reported for PPy‐based supercapacitors. The exceptional stability of PPy electrode can be attributed to two factors: 1) the flexible nature of FEG substrate accommodates large volumetric deformation and 2) the presence of immobile NS − dopants suppresses the counterion drain effect during charge–discharge cycling.