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Balancing the Electrical Double Layer Capacitance and Pseudocapacitance of Hetero-atom Doped Carbon

Abstract

Heteroatom-doped carbonaceous materials derived from polymers are emerging as a new class of promising supercapacitor electrodes. These electrodes have both electrical double layer capacitance (from carbon matrix) and pseudo-capacitance (from hetero-atoms). Balancing the electrical double layer capacitance and pseudo-capacitance is a key to achieve large capacitance at ultrafast current densities. Here we investigate the influence of pyrolysis temperature on capacitive performance of hetero-atom (oxygen and nitrogen) doped carbons derived from polypyrrole nanowire arrays. Structural and electrochemical characterizations reveal that the concentration of hetero-atoms as well as the ratio of electrical double layer capacitance and pseudo-capacitance can be tuned by varying the pyrolysis temperature. In fact the hetero-atom doped carbon sample obtained at a relatively lower pyrolysis temperature (500 oC) exhibits the optimal capacitive performance. It yields an outstanding areal capacitance of 324 mF/cm2 at 1 mA/cm2 (141 F/g @ 0.43 A/g), and more importantly, retains areal capacitance of 184.7 mF/cm2 (80.3 F/g @ 43.5 A/g) at an ultrahigh current density of 100 mA/cm2. An asymmetric supercapacitor consists of the hetero-atom doped carbon as anode delivers a maximum volumetric energy density of 1.7 mWh/cm3 at a volumetric power density of 0.014 W/cm3, which is among the best values reported for asymmetric supercapacitors.

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Publication details

The article was received on 14 Jun 2017, accepted on 09 Aug 2017 and first published on 09 Aug 2017


Article type: Paper
DOI: 10.1039/C7NR04234E
Citation: Nanoscale, 2017, Accepted Manuscript
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    Balancing the Electrical Double Layer Capacitance and Pseudocapacitance of Hetero-atom Doped Carbon

    Z. Huang, T. Liu, Y. Song, Y. Li and X. Liu, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR04234E

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