期刊
MICROMACHINES
卷 13, 期 6, 页码 -出版社
MDPI
DOI: 10.3390/mi13060905
关键词
carbon materials; energy storage and conversion; N; S co-doped; ultramicroporous; supercapacitors
类别
资金
- Youth Science Foundation of Suzhou Vocational Health College [SZWZY202012]
- National Natural Science Foundation of China [52062023]
N, S-doped ultramicroporous carbons were successfully prepared using L-cysteine as a nitrogen and sulfur source. The ultramicroporous structure and doping provide a high specific surface area and suitable pore size, facilitating the transport and adsorption of electrolyte ions. NSUC-0.4 exhibits high gravimetric capacitance and capacity retention, indicating its potential for practical applications.
N, S-doped ultramicroporous carbons (NSUC-x) with a high nitrogen/sulfur content and a narrow pore-size distribution of around 0.55 nm were firstly prepared using L-cysteine as a nitrogen and sulfur source. The phase, graphitization degree, morphology, specific surface area, pore structure and surface condition of NSUC-x are investigated to analyze the key role in electrochemical performance. Such an ultramicroporous structure and N, S doping not merely provide a high-specific surface area and a suitable pore size, but also induce a good wettability for the fast transport and adsorption of electrolyte ions. Due to the above strategies, the typical NSUC-0.4 exhibits a high gravimetric capacitance of 339 F g(-1) at 0.5 A g(-1) as well as a capacity retention of 91.6% after 10,000 cycles in a three-electrode system using a 6 M KOH electrolyte. More attractively, a NSUC-0.4-assembled symmetrical supercapacitor delivers an energy output of 7.4 Wh kg(-1) at 100 W kg(-1) in 6 M KOH as well as a capacity retention of 92.4% after 10,000 cycles, indicating its practical application prospect. Our findings open up new prospects for the design and electrochemical application of N, S-doped ultramicroporous carbons.
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