N, O and P co-doped honeycomb-like hierarchical porous carbon derived from Sophora japonica for high performance supercapacitors

被引:14
作者
Zhang, Li [1 ]
Zhu, Yuxia [1 ]
Zhao, Guangzhen [1 ]
Li, Yanjiang [1 ]
Zhu, Guang [1 ]
机构
[1] Suzhou Univ, Key Lab Spin Electron & Nanomat, Anhui Higher Educ Inst, Suzhou 234000, Peoples R China
关键词
REDUCED GRAPHENE OXIDE; ENERGY DENSITY; ELECTRODE MATERIAL; ACTIVATED CARBON; NITROGEN; OXYGEN; BIOMASS; SPHERES; ELECTROCATALYST; COMPOSITES;
D O I
10.1039/c9ra06934h
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Novel N, O and P co-doped honeycomb-like hierarchically porous carbon (N-O-P-HHPC) materials with a large specific surface area from Sophora japonica were prepared via a one-step activation and carbonization method and used as an electrode for supercapacitors. The results indicate that as-prepared N-P-HHPC with a large specific surface area (2068.9 m(2) g(-1)) and N (1.5 atomic%), O (8.4 atomic%) and P (0.4 atomic%) co-doping has a high specific capacitance of 386 F g(-1) at 1 A g(-1). Moreover, a 1.8 V symmetrical SC was assembled from the N-O-P-HHPC-3 electrode using 1 M Na2SO4 gel electrolyte, presenting a high energy density (28.4 W h kg(-1) at 449.9 W kg(-1)) and a long life cycling stability with only 7.3% capacitance loss after 10 000 cycles. Furthermore, the coin-type symmetrical SC using EMIMBF4 as electrolyte presents an ultrahigh energy density (80.8 W h kg(-1) at 1500 W kg(-1)). When the two coin-type symmetrical SCs are connected in series, eight red light-emitting diodes (LEDs) and a small display screen can be powered. These results demonstrate as-prepared N, O and P co-doped HHPC is a considerable candidate as a carbon electrode for energy storage devices.
引用
收藏
页码:37171 / 37178
页数:8
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