期刊
RSC ADVANCES
卷 9, 期 64, 页码 37171-37178出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ra06934h
关键词
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资金
- Provincial Natural Science Foundation of Anhui [1908085ME120]
- Primary Research and Development Program of Anhui Province [201904a05020087]
- Scientific Research Foundation of Suzhou University [2016XJXS05, 2018SZXYDZXZ02]
- Outstanding Youth Talents in Anhui Provincial Education Department [2017GXBJZD47]
- Innovative Research Team of Anhui Provincial Education Department [2016SCXPTTD]
- Key Discipline of Material Science and Engineering of Suzhou University [2017XJZDXK3]
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.
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