期刊
ACS APPLIED ENERGY MATERIALS
卷 2, 期 6, 页码 4234-4243出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.9b00481
关键词
supercapacitor; heteroatom doping; activated carbon; CVD; low cost; energy storage
资金
- National Science Centre, Poland [OPUS 2017/252/B/ST8/02702]
- City University of Hong Kong Strategic Research Grant (SRG) [7005105]
The growing requirement for high-performance energy-storage devices has spurred the development of supercapacitors, but the low energy density remains a technical hurdle. In this work, porous nitrogen-doped activated carbon (NAC) is prepared on a large scale from commercial activated carbon (AC) and inexpensive chemicals by a one-step method. The NAC material with 3.1 wt % nitrogen has a high specific surface area of 1186 m(2) g(-1) and shows a specific capacitance of 427 F g(-1) in a symmetric cell with an aqueous electrolyte. 98.2% of the capacity is reserved after 20 000 cycles at 20 A g(-1). The energy densities of the NAC are 17.2 and 87.8 Wh kg(-1) in acidic and organic electrolytes, respectively. Moreover, this simple process is readily scalable to address commercial demand and can be extended to the motivation of a variety of carbon based materials with poor capacitances.
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