期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 770, 期 -, 页码 803-812出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.08.164
关键词
Metal-organic frameworks; Porous carbon; Ni(OH)(2); Supercapacitor
资金
- Natural Science Foundation of Hebei Province [B2016203391]
- Natural Science Research Keystone Program of Universities in Hebei Province [ZD2016075]
- Foundation of the Key Technology Research and Development Program of Qinhuangdao [201501B008]
It is a challenge to obtain high specific capacitance and high energy density for carbon materials applied in energy storage. In this work, a metal-organic framework (MOF) with high surface area (1149 m(2) g(-1)) is used for the design of Co/C nanocomposites. Ni(OH)(2)@Co/C nanocomposites with core/shell structure are synthesized by carbonizing MOF nanoparticles to form the cores of Co/C and growing 2-dimensional Ni(OH)(2) nanosheets on the surfaces, as the shells. The Ni(OH)(2)@Co/C nanocomposites exhibit excellent electrochemical properties, including high specific capacitance (952 F g(-1), 0.5 A g(-1)), high-rate dischargeability (692 F g(-1), 20 A g(-1)), and good cycle stability (84%, 10000 th cycles), being ascribed to the combined effect of the components and the structure characteristics, i.e., Ni(OH)(2) ultrathin nanosheets for high capacitance, Co nanoparticles for high rate dischargeability and nanoporous carbon for excellent cycle life. The asymmetric supercapacitor assembled with the Ni(OH)(2)@Co/C materials and active carbon presents a higher energy density of 33.6 Wh kg(-1) at 516.3 W kg(-1). The simple but powerful design routine will be beneficial to the application of MOF in such energy storage filed as battery and supercapacitor. (C) 2018 Elsevier B.V. All rights reserved.
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