期刊
APPLIED SURFACE SCIENCE
卷 505, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2019.144589
关键词
Sulfonated graphene; NiO; Energy storage; Cycle stability; Asymmetric supercapacitor
类别
资金
- National Natural Science Foundation of China [61571245]
- Natural Science Foundation of Jiangsu Province [BK20131249]
- Senior Personnel Scientific Research Foundation of Jiangsu University [15JDG084]
- Natural Science Fund Project of Colleges in Jiangsu Province [16KJB430008]
- College Students Innovative Practice Fund of Jiangsu University Industrial Center [ZXJG2019064]
The preparation of a structurally optimized electrode material plays an important role in the energy application of the supercapacitor. Here, we report that an electrode assembly composed of a ternary material has a unique microstructure and excellent electrochemical performance. Our supercapacitor electrodes consist of sulfonated graphene (SGO) as a substrate, a well-dispersed metal oxide (NiO) and a polymer (PANI) that provides more surface area. Hydrothermal and chemical oxidative polymerization methods are used to formulate the core-shell structure composed of the aforementioned three materials, and the synergistic effect improves the performance of supercapacitors, including high specific capacitance and excellent cycle stability. The PANI/NiO/SGO (2:1) ternary composite has a high specific capacitance of 1350 F g(-1) at a current density of 1 A g(-1) and a capacity retention rate of 92.23% after 5000 cycles. The prepared all-solid states asymmetric supercapacitor PANI/NiO/SGO//Active Carbon (AC) has a high specific capacity of 308.8 F g(-1), high energy density (109.8 Wh kg(-1)), high power density (0.8 kW kg(-1)) and stable cycle life (capacitor retention rate is 91.15% after 10,000 cycles), while a green LED indicator is illuminated.
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