期刊
ELECTROCHIMICA ACTA
卷 168, 期 -, 页码 414-422出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2015.03.193
关键词
spent coffee grounds; co-doped; microwave-assisted method; mesopores; capacitance
资金
- NASA Research Infrastructure Development grant
Spent coffee grounds, an abundant daily waste, were utilized to produce P, N co-doped C (PNDC) by a novel microwave-assisted method employing ammonium polyphosphate as the only other reactant. Different PNDCs (namely PNDC-1, PNDC-2 and PNDC-3) were synthesized by varying the ratio of spent coffee grounds to ammonium polyphosphate. The synthesized materials were found to contain spherically shaped particles as evidenced from scanning electron microscopy. X-ray photoelectron spectroscopy revealed PNDCs to contain P and N in addition to C and O. PNDC-3 was discovered to possess a surface area of 999.64 m(2) g (1) with the presence of micropores, mesopores and macropores. PNDCs exhibited high specific capacitance values in acid and alkaline conditions with PNDC-3 exhibiting the highest specific capacitance value of 286 F g (1) in 1 M H2SO4. Also, PNDC-2 was observed to be highly stable under acidic and alkaline conditions with continuous cycling. (C) 2015 Elsevier Ltd. All rights reserved.
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