Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 25, Issue 29, Pages 4626-4632Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201501709
Keywords
anions; cycling stability; functionalized graphite; polypyrrole; supercapacitors
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Funding
- National Natural Science Foundation of China [21273029, 21303010]
- Research Foundation for Doctoral Program of Higher Education of China [20120042110024]
- Committee on Research from the University of California, Santa Cruz
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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 -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.
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