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Immoblization of phosphotungstate through doping in polypyrrole for supercapacitors

Abstract

Immoblization of phosphotungstate is achieved through doping in polypyrrole via electrochemical deposition of polypyrrole (PPy) in the presence of phosphotungstate anion (PW12) on carbon nanotube film. Stable electrochemical stability in neutral solution is realized for PW12 in the fabricated ECNT-PPy/5PW12, owing to the proton sponge provided by PPy. ECNT-PPy/5PW12 shows a high areal capacitance of 1300.0 mF cm-2 in LiCl solution at 1 mA cm-2. ECNT-PPy/5PW12 also displays high rate capability and good cyclic stability due to the interaction of incorporated PW12 and the polymer matrix. ECNT-PPy/5PW12 can retain 78.6% and 92.0% of its capacitance with 40 times current increase and after 10,000 galvanostatic charge/discharge cycles, respectively. An asymmetric supercapacitor with ECNT-PPy/5PW12 anode and CNT-MnO2 cathode demonstrates high volumetric energy density (4.71 mWh cm-3 at 13.85 mW cm-3) and long cycle life (90.0% capacitance retention after 10,000 charge/discharge cycles).

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Publication details

The article was received on 02 Mar 2019, accepted on 08 Apr 2019 and first published on 08 Apr 2019


Article type: Paper
DOI: 10.1039/C9DT00925F
Citation: Dalton Trans., 2019, Accepted Manuscript

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    Immoblization of phosphotungstate through doping in polypyrrole for supercapacitors

    Z. Chang, X. Sang, Y. Song, X. Sun and X. Liu, Dalton Trans., 2019, Accepted Manuscript , DOI: 10.1039/C9DT00925F

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