A facile preparation of three dimensional N, S co-doped graphene hydrogels with thiocarbohydrazide for electrode materials in supercapacitor

Three-dimensional (3D) N, S co-doped graphene hydrogels (NSGHs) were facilely prepared by using thiocarbohydrazide as reducing and doping agents in an aqueous solution. Due to their porous architectures, the as-prepared NSGHs all exhibited high specific capacitance of 123.4, 120.9 and 141.1Fg−1 at 0...

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Published in:Materials letters 2015-05, Vol.147, p.97-100
Main Authors: Xing, Ling-Bao, Hou, Shu-Fen, Zhang, Jing-Li, Zhou, Jin, Li, Zhaohui, Si, Weijiang, Zhuo, Shuping
Format: Article
Language:English
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Summary:Three-dimensional (3D) N, S co-doped graphene hydrogels (NSGHs) were facilely prepared by using thiocarbohydrazide as reducing and doping agents in an aqueous solution. Due to their porous architectures, the as-prepared NSGHs all exhibited high specific capacitance of 123.4, 120.9 and 141.1Fg−1 at 0.3Ag−1 for NSGHs-1, NSGHs-2, and NSGHs-5 in KOH electrolyte, respectively. Moreover, their specific capacitance can still be maintained for 72.3%, 59.4%, and 71.3% even with an increase of the discharging current density of 10Ag−1, respectively. Particularly, the NSGHs-5 based supercapacitor has exhibited excellent electrochemical stability and high degree of reversibility in the long-term cyclic test (90% retention after 4000 cycles). •Three-dimensional N, S co-doped graphene hydrogels (NSGHs) were prepared.•NSGHs all exhibited high specific capacitance due to the porous architectures.•NSGHs based supercapacitors exhibited good electrochemical properties.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2015.02.031