期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 822, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.153689
关键词
Transition metal oxides; Low crystallinity; Lattice boundaries; Oxygen vacancies; Asymmetric supercapacitor
资金
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Natural Science Foundation of Jiangsu Province of China (Basic Research Program of Jiangsu Province of China) [BK20171409]
- National Basic Research Program of China (973 Program) [2014CB239701]
- National Natural Science Foundation of China [21173120, 51372116, 51372115]
- Jiangsu Key Laboratory of High Efficiency Electrochemical Energy Storage Technology Open Project Funds [EEST2018-6]
The electrochemical performance of NiCo2O4 currently still faces inherently limited active sites and less available surface areas, hindering its application as the pseudocapacitive electrode in supercapacitors. Accordingly, the cross-linked NiCo2O4 nanosheets with low crystallinity and rich oxygen vacancies on nickel foam (Pd-NCO/NF) by introducing noble metal palladium (Pd2+) has been fabricated. The results show that the lattice orientation of NiCo2O4 nanoparticles is disordered by Pd doping, leading to a decrease in crystallinity. In addition, low crystallinity with a large number of lattice boundaries results in the high electrochemical activity with 2484.4 F g(-1). At high current density of 10 A g(-1), the capacitance retention could remain 95% after 8000 cycles. An asymmetric supercapacitor of Pd-NCO/NF//activated polyaniline derived carbon (AFDC) demonstrates high energy density of 47.5 W h kg(-1) at 425.4 W kg(-1) and promotes excellent cycle stability, with a capacity retention rate of 86% after 10,000 cycles. (C) 2020 Elsevier B.V. All rights reserved.
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