Journal
JOURNAL OF SOLID STATE CHEMISTRY
Volume 262, Issue -, Pages 327-334Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2018.03.023
Keywords
NiCo2O4 nanosheets/CuCo2O4 nanocones; Electrode; Asymmetric supercapacitor; Specific capacitance
Funding
- National Natural Science Foundation of China [61674071, 21477050, 51602131, 21522603]
- Chinese German Cooperation Research Project [GZ1091]
- Excellent Youth Foundation of Jiangsu Scientific Committee [BK20140011]
- Program for New Century Excellent Talents in University [NCET-13-0835]
- Henry Fok Education Foundation [141068]
- Six Talents Peak Project in Jiangsu Province [XCL-025]
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In this work, a series of NiCo2O4/CuCO2O4 composites were prepared by a two-step hydrothermal method. The optimized NiCo2O4/CuCo2O4 electrode shows more than 5 times area capacitance (4.97 F cm(-2)) than pure NiCo2O4 at the current density of 1 mA cm(-2). The best performance of sample assembled an asymmetric supercapacitor could reach up to 42 F g(-1) at the current density of 1 A g(-1). In addition, the maximum energy density of 15 W h kg(-1) was achieved with the power density of 814 W kg(-1). The as-prepared active electrode material also reveals excellent cycling stability with 90.6% capacitance retention after 5000 cycles. These results indicate potential application in developing energy storage devices with high energy density power density.
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