期刊
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
卷 155, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jpcs.2021.110110
关键词
Core-shell; Nanoflake; Excellent electrochemical performance; Asymmetric supercapaitor
资金
- National Science Foundation of China [21505001]
- Anhui province natural science fundation project [KJ2020A0280]
- launching scientific research funds for doctors of Anhui University of Science and Technology [11109]
- University Synergy Innovation Program of Anhui Province [GXXT-2019028]
- major programs of Science and Technology of Anhui Province [201903a06020003]
The core-shell structured Ni@Ni3S2@NiCo2O4 nanoflakes synthesized using a universal strategy exhibit excellent electrochemical performance with high specific capacitance and cycling stability. Assembling a hybrid supercapacitor with these nanoflakes as positive electrode, activated carbon as negative electrode, and KOH as electrolyte results in a device with high energy density, power density, and good cycling stability.
A universal strategy was used to synthesize the core-shell structure Ni@Ni3S2@NiCo2O4 nanoflakes. As wished, benefiting from the core-shell structure of nanoflakes, the as-synthesized Ni@Ni3S2@NiCo2O4 electrode materials show excellent electrochemical performance. Furthermore, the effect of ethylenediamine on the electrochemical performances of the Ni@Ni3S2@NiCo2O4 nanoflakes was studied. In a three-electrode system, the specific capacitance achieves 13.4 F cm(-2) at a current density of 1 mA cm(-2) and even 11.7 F cm(-2) at 10 mA cm(-2). Moreover, the fabricated hybrid supercapacitor was assembled using Ni@Ni3S2@NiCo2O4 as a positive electrode, the activated carbon (AC) as a negative electrode, and KOH as an electrolyte, respectively. The assembled device delivers an energy density of 57 Wh.kg(-1) at a power density of 3700 W kg(-1) and good cycling stability (82% capacitance retention after 8000 cycles), demonstrating its excellent energy storage property in supercapacitor.
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