Journal
RSC ADVANCES
Volume 5, Issue 57, Pages 45718-45724Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ra14513e
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Funding
- National Natural Science Foundation of China for Innovative Research Group [51221462]
- Strategic Chinese-Japanese Joint Research Program [2013DFG60060]
- Research and Innovation Project for College Graduates of Jiangsu Province [CXZZ13_0942]
- Basic Research Program of Jiangsu Province [BK20130171]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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A scalable and facile method was developed to synthesize nitrogen-doped porous carbon foams (NDPCFs) using graphitic carbon nitride (g-C3N4) nanosheets as hard templates through the calcination of mesophase pitch. The morphology, structure, chemical composition and electrochemical performance of the as-prepared NDPCFs were characterized and investigated. The results show that NDPCFs are fabricated from crimpled and folded carbon nanosheets and have a three-dimensional interconnected structure. The carbon nanosheets show a certain degree of orientation of graphite crystallites. The specific surface area, wall thickness and nitrogen content are controllable by tuning the mass ratio of g-C3N4 nanosheets to mesophase pitch. The content of nitrogen species, most of which are quaternary-N and pyridinic-N components, significantly decreases from 6.48 to 0.74 at% with raising calcination temperature from 800 to 1600 degrees C. The NDPCFs prepared at 800 degrees C have a high specific surface area of 2098 m(2) g(-1), an ultra-large pore volume of 5.048 cm(3) g(-1) and a high nitrogen content of 6.48 at%. Furthermore, this material exhibits remarkable electrochemical performance as an electrode material for supercapacitors with a specific capacitance of 125.6 F g(-1) even at a high scan rate of 200 mV s(-1).
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