Journal
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
Volume 57, Issue 18, Pages 6246-6256Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.iecr.8b00467
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Funding
- National Natural Science Foundation of China [21576138, 51572127]
- China-Israel Cooperative Program [2016YFE0129900]
- PhD Program Foundation of Ministry of Education of China [20133219110018]
- Natural Science Foundation of Jiangsu Province [BK20160828]
- Postdoctoral Foundation [1501016B]
- Six Major Talent Summit [XNY-011]
- PAPD of Jiangsu Province
- program for Science and Technology Innovative Research Team in Universities of Jiangsu Province, China
- [NCET-12-0629]
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A facile solvothermal method followed by a postannealing process is used to prepare NiO@NiCo2O4 core-shell nanosheet arrays supported on Ni foam substrate for a high-performance supercapacitor. The hybrid electrode possesses a three-dimensional structure with the shell of NiCo2O4 nanoflakes anchored on the core of ordered NiO nanosheets. It shows high specific capacitance of 1623.6 F g(-1) (or specific capacity of 225.5 mAh g(-1)) at 2 A g(-1)and excellent rate performance with a 96% capacitance retention rate at 20 A g(-1)The high cycling stability is proved by nearly 90% capacitance retention at 10 A g(-1). after 10000 cycles. Its asymmetric supercapacitor, assembled with NiO@NiCo2O4/Ni foam and the activated carbon/Ni foam as the positive and negative electrode, respectively, displays the specific energy of 52.5 W h kg(-1) at 387.5 W kg(-1). The excellent electrochemical performance of NiO@NiCo2O4 electrode indicates its great potential in applications of energy storage devices.
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