期刊
JOURNAL OF ENERGY STORAGE
卷 11, 期 -, 页码 242-248出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.est.2017.03.010
关键词
NiFe layered double hydroxides; Manganese dioxide; Supercapacitors
资金
- National Natural Science Foundation of China [21576034, 61474011]
- International S&T Cooperation Projects of Chongqing [CSTC2013gjhz90001]
- State Education Ministry and Fundamental Research Funds for the Central Universities [106112016CDJZR135506]
- Laboratory of Precision Manufacturing Technology, CAEP [KF13004]
The flower-like NiFe layered double hydroxides loaded on Ni foam (NF/NiFe LDHs) are synthesized via one-pot hydrothermal method and the synthesized NF/NiFe LDHs are further coated with MnO2 nanosheets (MnO2@NF/NiFe LDHs) through an extra hydrothermal process. The excellent supercapacitor performance of MnO2@NF/NiFe LDH has been observed with a high capacitance of 4274.4 mF cm(2) at 5 mA cm(2) and a capacitance retention of 95.6% after 1000 cycles from a traditional three-electrode system. A low-cost flexible asymmetric supercapacitor has also been designed and fabricated using MnO2@NF/NiFe LDH as anode and active graphene as cathode. The working voltage window of this asymmetric supercapacitor is up to 1.4 V and the asymmetric supercapacitor delivered an energy density of 24.6 mWh cm(2) at 350 mW cm(2). These outstanding supercapacitor performances of the synthesized composite MnO2@NF/NiFe LDHs are attributed to the combination of unique NiFe layered double hydroxides structure and higher conductivity of MnO2 nanosheets. (C) 2017 Elsevier Ltd. All rights reserved.
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