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  • In situ synthesized heteropoly acid/polyaniline/graphene nanocomposites to simultaneously boost both double layer- and pseudo-capacitance for supercapacitors.

In situ synthesized heteropoly acid/polyaniline/graphene nanocomposites to simultaneously boost both double layer- and pseudo-capacitance for supercapacitors.

Physical chemistry chemical physics : PCCP (2012-08-11)
Zhiming Cui, Chun Xian Guo, Weiyong Yuan, Chang Ming Li
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.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Phosphomolybdic acid solution, spray reagent, 10% in ethanol
Sigma-Aldrich
Phosphomolybdic Acid Solution
Sigma-Aldrich
Phosphomolybdic acid solution, ready-to-use spray and plunge reagent, for chromatography
Sigma-Aldrich
Sodium phosphomolybdate hydrate, technical
Sigma-Aldrich
Phosphomolybdic acid solution, 20 wt. % in ethanol