title: In situ synthesized heteropoly acid/polyaniline/graphene nanocomposites to simultaneously boost both double layer- and pseudo-capacitance for supercapacitors.
abstract: It is challenging to simultaneously increase double layer- and pseudo-capacitance for supercapacitors. Phosphomolybdic acid/polyaniline/graphene nanocomposites (PMo(12)-PANI/GS) were prepared by using PMo(12) as a bifunctional reagent for not only well dispersing graphene for high electrochemical double layer capacitance but also in situ chemically polymerizing aniline for high pseudocapacitance, resulting in a specific capacitance of 587 F g(-1), which is ~1.5 and 6 times higher than that of PANI/GS (392 F g(-1)) and GS (103 F g(-1)), respectively. The nanocomposites also exhibit good reversibility and stability. Other kinds of heteropolyacids such as molybdovanadophosphoric acids (PMo(12-x)V(x), x = 1, 2 and 3) were also used to prepare PMo(12-x)V(x)-PANI/GS nanocomposites, also showing enhanced double layer- and pseudo-capacitance. This further proves the proposed concept to simultaneously boost both double layer- and pseudo-capacitance and demonstrates that it could be a universal approach to significantly improve the capacitance for supercapacitors.
authors.affiliation: Institute for Clean Energy & Advanced Materials, Southwest University, PR China.
authors.forename: Zhiming
authors.initials: Z
authors.lastname: Cui
authors.forename: Chun Xian
authors.initials: CX
authors.lastname: Guo
authors.forename: Weiyong
authors.initials: W
authors.lastname: Yuan
authors.forename: Chang Ming
authors.initials: CM
authors.lastname: Li
mesh_terms: D000814:Aniline Compounds / Q000737:chemistry*; D025802:Electric Capacitance; D055664:Electrochemical Techniques; D004566:Electrodes; D006108:Graphite / Q000737:chemistry*; D008982:Molybdenum / Q000737:chemistry*; D053761:Nanocomposites / Q000737:chemistry* / Q000648:ultrastructure; D010756:Phosphoric Acids / Q000737:chemistry*; D011522:Protons
chemical_list: D000814:Aniline Compounds; D010756:Phosphoric Acids; D011522:Protons; C416807:polyaniline; D006108:Graphite; D008982:Molybdenum; C003125:phosphomolybdic acid