期刊
NANOTECHNOLOGY
卷 28, 期 31, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6528/aa7ab9
关键词
NiCo2O4; boron and nitrogen co-doped graphene; hybrid; asymmetric supercapacitor; long cycling lifetime
资金
- National Natural Science Foundation of China [21576138, 51572127]
- China Israel Cooperative Program [2016YFE0129900, NCET-12-0629]
- PhD Program Foundation of Ministry of Education of China [20133219110018]
- Natural Science Foundation of Jiangsu Province [BK20160828]
- Post-Doctoral Foundation [1501016B]
- Six Major Talent Summit [XNY-011]
- PAPD of Jiangsu Province
- program for Science and Technology Innovative Research Team in Universities of Jiangsu Province, China
Strongly coupled boron and nitrogen co-doped graphene (BN-G) hybrids with nickel cobaltite (NiCo2O4) nanosheets (NCO/BN-G) were fabricated by a facile soft-chemical method for asymmetric supercapacitors with high-performance. The strong interaction between BN-G and NiCo2O4 nanosheets are explored by various techniques. The effect of heteroatom doping on electrochemical properties of the hybrids is systematically investigated. The strong synergistic effect between NiCo2O4 and BN-G leads to a specific capacitance of 106.5 mA h g(-1) at the current density of 0.5 A g-1 and capacitance retention of 96.8% after 10 000 cycles at 5 A g(-1), much better than those of the pure NiCo2O4 and its hybrid with N-doped graphene. Moreover, an asymmetric supercapacitor device, assembled with NCO/BN-G and activated carbon (NCO/BN-G//AC), exhibits a maximum energy density of 45.6 Wh kg(-1) and an excellent cycling stability. The improved electrochemical performance of the NCO/BN-G hybrid is attributed to the good conductivity of BN-G and the synergistic effect between NiCo2O4 nanosheets and BN-G combined together through a plane-to-plane contact mode.
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