Journal
NANO ENERGY
Volume 19, Issue -, Pages 222-233Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2015.10.036
Keywords
Co3O4 CoMOO4; Core-shell architecture; Hydrothermal method; Synergistic effect; Solid-state supercapacitors; Energy storage
Categories
Funding
- National Natural Science Foundation of China [51572058, 91216123, 51174063, 51502057, 51521001]
- National Basic Research Program of China [2013CB934103, 2012CB933003]
- National Natural Science Fund for Distinguished Young Scholars [51425204]
- Natural Science Foundation of Heilongjiang Province [E201436]
- International Science a Technology Cooperation Program of China [2013DFR10630, 2015DFE52770]
- Specialized Research Fund for the Doctoral Program of Higher Education [SRFDP 20132302110031]
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Herein, we develop a supercapacitor electrode composed of 3D self-supported Co3O4@CoMoO4 core-shell architectures directly grown on nickel foam. Co3O4 nanocones are grown vertically on the nickel foam as the core and CoMoO4 nanosheets are further engineered to immobilized on the surface of the nanocones as the shell. The unique architecture take advantage of a large interfacial area, numerous channels for rapid diffusion of electrolyte ions, fast electron transport and the high electrochemical activity from both the Co3O4 and CoMoO4. The electrode exhibits high specific capacitance of 1902 F g(-1) at current density of 1 A g(-1), good rate capability, and cycling stability with 99% capacitance retention after 5000 cycles. Solid-state asymmetric supercapacitor (Co3O4@CoMoO4//CNTs) and symmetric supercapacitor (Co3O4@CoMoO4//Co3O4@CoMoO4) are fabricated with excellent electrochemical performance. The asymmetric supercapacitor with a maximum voltage of 1.6 V has demonstrated a high energy density of 45.2 W h kg(-1), a high power density of 6400 W kg(-1) at 37.0 W h kg(-1), and outstanding cyclic stability with the capacitance retention of 98.5% after 3000 cycles. (C) 2015 Elsevier Ltd. All rights reserved.
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