Journal
APPLIED SURFACE SCIENCE
Volume 497, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2019.143725
Keywords
Hollow; CuCo2O4/CuO@NiCo2S4; Nanocomposites; Supercapacitors
Categories
Funding
- Fundamental Research Funds for Central Universities of the Central South University [2017zzts100]
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In this study, hollow CuCo2O4/CuO nanocomposites were fabricated by a hydrothermal method for the first time. NiCo2S4 nanosheets were coated on these nanocomposites by simple potentiostatic electrodeposition to form NiCo2S4 nanosheet-modified hollow CuCo2O4/CuO nanocomposites as advanced electrodes for asymmetric supercapacitors. A unique three-dimensional (3D) nanoarchitecture was built using one-dimensional (1D) hollow CuCo2O4/CuO nanocomposites and two-dimensional (2D) NiCo2S4 nanosheets. This multidimensional synergistic effect resulted in hollow CuCo2O4/CuO@ NiCo2S4 nanocomposites with high areal capacitance (10.33 F cm(-2), 2459 F g(-1)) at 10 mA cm(-2), good rate capability, and high stability (93.2% retention after 10,000 cycles). Moreover, an environmentally friendly and economical asymmetric supercapacitor was prepared by using hollow CuCo2O4/CuO@ NiCo2S4 nanocomposites and activated carbon (AC) as positive and negative electrodes, respectively. This assembly displayed a high energy density of 0.824 mWh cm(-2) at a power density of 8 mW cm(-2), and 91.2% of the specific capacitance was preserved after 10,000 cycles at 20 mA cm(-2). The novel electrode material with a coordinative nanostructure prepared herein provides new possibilities for fabricating high-performance supercapacitors.
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