The excellent capacitive capability for N,P-doped carbon microsphere/reduced graphene oxide nanocomposites in H2SO4/KI redox electrolyte
In order to ameliorate the capacitance and energy density of supercapacitors in aqueous electrolytes, nitrogen- and phosphorus-codoped carbon microspheres/reduced graphene oxide nanocomposites are obtained by hydrothermal treatment of graphite oxide and N,P-doped carbon microsphere. The as-prepared...
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Published in | Journal of materials science Vol. 54; no. 10; pp. 7665 - 7678 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
New York
Springer US
01.05.2019
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | In order to ameliorate the capacitance and energy density of supercapacitors in aqueous electrolytes, nitrogen- and phosphorus-codoped carbon microspheres/reduced graphene oxide nanocomposites are obtained by hydrothermal treatment of graphite oxide and N,P-doped carbon microsphere. The as-prepared nanocomposites display a high specific surface area of 604.3 m
2
g
−1
and hierarchical pore structure composed of micropores, mesopores, and macropores. N,P-codoped carbon microspheres/reduced graphene oxide are used as electrode materials in the redox electrolyte of H
2
SO
4
and KI aqueous solution, exhibiting a excellent capacitance performance of up to ~ 654 F g
−1
at 2 A g
−1
, corresponding to the energy density of 14.53 Wh kg
−1
at power density of 402 W kg
−1
. Even at a high current of 20 A g
−1
, the electrode can keep a capacitance of 318 F g
−1
, showing an energy density of 7 Wh kg
−1
at power density of 3984 W kg
−1
. This study indicates the potential of nitrogen- and phosphorus-codoped carbon microspheres/reduced graphene oxide in high energy density supercapacitor. |
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ISSN: | 0022-2461 1573-4803 |
DOI: | 10.1007/s10853-019-03414-x |