期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 527, 期 -, 页码 230-240出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2018.05.020
关键词
Biomass; Nitrogen-doped carbons; Three-dimensional interconnected mesopores; Electrocatalysis; Energy storage
资金
- National Key Research and Development Program of China [2016YFB0700204]
- NSFC [51602332, 51502327]
- Science and Technology Commission of Shanghai Municipality [15520720400, 15YF1413800, 16DZ2260603]
- One Hundred Talent Plan of Chinese Academy of Sciences
In this paper, a series of nitrogen-doped mesoporous carbons (NMCs) with three-dimensional (3D) interconnected mesopores have been prepared using flour as carbon source, dicyanamide as nitrogen source and colloidal silica as hard template. The optimized material (NMC-4) prepared with the colloidal silica/flour mass ratio of 4 has a high nitrogen doping level of 5.69 at.% and large specific surface area of 995 m(2) g(-1) as well as 3D interconnected mesopores (12.9 nm). As the oxygen reduction reaction (ORR) electrocatalyst among various NMCs, NMC-4 exhibits the superior performance and much better stability and methanol crossover with a four-electron dominant reaction pathway compared to commercial 20 wt% Pt/C. Furthermore, as a supercapacitor (SC) electrode material, NMC-4 exhibits a high specific capacitance of 178.5 F g(-1) at a current density of 0.5 A g(-1) and long cycle life (94.5% capacity retention after 5000 cycles). It also shows a good rate capacity as 76.1% of original specific capacitance remains when the current density increases from 0.5 to 20 A g(-1). The high-performance of NMCs results from the synergetic effects of 3D interconnected mesopores, large surface area, and high N-doping level, enabling fast mass transport and electron transfer during the electrochemical process. This work provides a facile and efficient strategy to heteroatom-doped carbons from extensively available biomass, showing great potentials in electrocatalysis, energy storage, and other applications. (C) 2018 Published by Elsevier Inc.
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