期刊
SCIENCE BULLETIN
卷 65, 期 7, 页码 546-556出版社
ELSEVIER
DOI: 10.1016/j.scib.2020.01.011
关键词
NiO; NiO@NiMoO4@PPy; Porous spherical structure; Supercapacitor; Cycling stability
资金
- National Natural Science Foundation of China [U1960107, 21773060, 51771046, 51674068]
- Fundamental Research Funds for the Central Universities [N182304014]
- Key Program for International S&T Cooperation Projects of China [2017YFE0124300]
In this work, a rational design and construction of porous spherical NiO@NiMoO4 wrapped with PPy was reported for the application of high-performance supercapacitor (SC). The results show that the NiMoO4 modification changes the morphology of NiO, and the hollow internal morphology combined with porous outer shell of NiO@NiMoO4 and NiO@NiMoO4@PPy hybrids shows an increased specific surface area (SSA), and then promotes the transfer of ions and electrons. The shell of NiMoO4 and PPy with high electronic conductivity decreases the charge-transfer reaction resistance of NiO, and then improves the electrochemical kinetics of NiO. At 20 A g(-1), the initial capacitances of NiO, NiMoO4, NiO@NiMoO4 and NiO@NiMoO4@PPy are 456.0, 803.2, 764.4 and 941.6 F g(-1), respectively. After 10,000 cycles, the corresponding capacitances are 346.8, 510.8, 641.2 and 904.8 F g(-1), respectively. Especially, the initial capacitance of NiO@NiMoO4@PPy is 850.2 F g(-1), and remains 655.2 F g(-1) with a high retention of 77.1% at 30 A g(-1) even after 30,000 cycles. The calculation result based on density function theory shows that the much stronger Mo-O bonds are crucial for stabilizing the NiO@NiMoO4 composite, resulting in a good cycling stability of these materials. (C) 2020 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.
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