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Issue 18, 2017
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Capacitive performance of ruthenium-coordinated polypyrrole

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Ruthenium coordinated polypyrrole electrodeposited on a carbon paper substrate is developed as an active electrode material for supercapacitors. PPy–Ru(12) was formed by electrochemical polymerization of the ruthenium chloride coordinated pyrrole monomer with a saturation coordination time of 12 h. The capacitance of PPy declined from 249 at 1.0 A g−1 to 102 F g−1 at 20.0 A g−1 with a capacitance retention of 40.9%. The capacitance of PPy–Ru(12) declined from 618 at 1.0 A g−1 to 301 F g−1 at 20.0 A g−1 with a capacitance retention of 48.7%, presenting higher rate capability. The coordination process could induce bipolarons to improve the electrochemical conductivity and rate capability. The capacity retention ratio highly increased from 79.4% for PPy to 91.4% for PPy–Ru(12) after 2000 cycles at 20.0 A g−1, presenting the superior cycling stability of PPy–Ru(12). The coordination reaction between the pyrrole monomer and RuCl3 led to the formation of a tetrahedral structure that restrained volume swelling or shrinking of PPy during the charge–discharge process, accordingly causing improved electrochemical cycling stability. In addition, the all-solid-state PPy–Ru(12) supercapacitor showed a capacitance of 122 F g−1 at 2.0 A g−1 and a capacity retention ratio of 82.8% after 500 cycles. This PPy–Ru(12) with good capacitive performance and electrochemical stability presents promising application as a supercapacitor electrode material.

Graphical abstract: Capacitive performance of ruthenium-coordinated polypyrrole

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Publication details

The article was received on 07 Apr 2017, accepted on 03 Aug 2017 and first published on 03 Aug 2017

Article type: Paper
DOI: 10.1039/C7NJ01151B
Citation: New J. Chem., 2017,41, 10312-10323
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    Capacitive performance of ruthenium-coordinated polypyrrole

    Y. Zhou and Y. Xie, New J. Chem., 2017, 41, 10312
    DOI: 10.1039/C7NJ01151B

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