期刊
APPLIED SURFACE SCIENCE
卷 508, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2019.144876
关键词
Core-shell structure; Ni3S2@VO2; Areal specific capacity; Cycling stability; Symmetric supercapacitor
类别
资金
- National Natural Science Foundation of China [21601079, 51473074, 21771095]
- Shandong Provincial Natural Science Foundation [ZR2016EMQ06, ZR2017JL013, ZR2019MEM031]
- Colleges and universities in Shandong Province science and technology projects [J17KA097]
Rational design of composite with other electroactive materials can effectively improve the supercapacitive performances through the modulation of electronic structure and conductivity of the hybrid material. In this work, core-shell structured Ni3S2@VO2 nanorods on the nickel foam are prepared through a one-pot hydrothermal method. The addition of VO2 effectively reduces the charge transfer resistance and thus enhances the electrochemical conductivity. The nickel foam provides a platform for the in situ dispersive growth of Ni3S2@VO2 as well as a superhighway for the transformation of electrons. The Ni3S2@VO2 shows a high areal specific capacity of 1.09 C cm(-2) at 1 mA cm(-2). After a slight decrease in the initial 200 cycles, the discharge capacity remains almost constant at about 1.00 C cm(-2) during the following cycles. At a high current of 50 mA cm(-2), the areal specific capacitance is 0.09 C cm(-2). A symmetric supercapacitor is assembled using Ni3S2@VO2 as both the anode and cathode. The specific capacity of it is 0.864 C cm(-2) at a current of 1 mA cm(-2). Good cycling stability and rate capability are also obtained. All these features promise it a high performance supercapacitor electrode.
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