期刊
CHINESE PHYSICS B
卷 23, 期 8, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1674-1056/23/8/086101
关键词
boron-nitrogen co-doped porous carbon; asphaltene; preparation; supercapacitors
资金
- National Natural Science Foundation of China [21276045]
Oxidized asphaltene (OA), a thermosetting material with plenty of functional groups, is synthesized from asphaltene (A) using HNO3/H2SO4 as the oxidizing agent. Boron, nitrogen co-doped porous carbon (BNC-OA) is prepared by carbonization of the mixture of boric acid and OA at 1173 K in an argon atmosphere. X-ray photoelectron spectroscopy (XPS) characterization reveals that the BNC-OA has a nitrogen content of 3.26 at.% and a boron content of 1.31 at.%, while its oxidation-free counterpart (BNC-SA) has a nitrogen content of 1.61 at.% and a boron content of 3.02 at.%. The specific surface area and total pore volume of BNC-OA are 1103 m(2).g(-1) and 0.921 cm(3).g(-1), respectively. At a current density of 0.1 A.g(-1), the specific capacitance of BNC-OA is 335 F.g(-1) and the capacitance retention can still reach 83% at 1 A.g(-1). The analysis shows that the superior electrochemical performance of the BNC-OA is attributed to the pseudocapacitance behavior of surface heteroatom functional groups and an abundant pore-structure. Boron, nitrogen co-doped porous carbon is a promising electrode material for supercapacitors.
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