期刊
MATERIALS
卷 13, 期 21, 页码 -出版社
MDPI
DOI: 10.3390/ma13214870
关键词
honeycomb-like structure; Ni-MOF; Ni(OH)(2); electrode material; supercapacitor
类别
资金
- National Natural Science Foundation of China, China [51471105]
- Natural Science Foundation of Shanghai [20ZR1422200]
Ni(OH)(2) derived from an MOF template was synthesized as an electrode material for supercapacitors. The electrochemical performance of the electrode was adjusted by effectively regulating the morphology of Ni(OH)(2). The evolution of electrochemical performance of the electrode with morphology of Ni(OH)(2) was highlighted in detail, based on which honeycomb-like Ni(OH)(2) was successfully synthesized, and endowed the electrode with outstanding electrochemical performance. For the three-electrode testing system, honeycomb-like Ni(OH)(2) exhibited a very high specific capacitance (1865 F center dot g(-1) at 1 A center dot g(-1), 1550 F center dot g(-1) at 5 mV center dot s(-1)). Moreover, it also presented an excellent rate capability and cycling stability, due to 59.46 % of the initial value (1 A center dot g(-1)) being retained at 10 A center dot g(-1), and 172% of initial value (first circle at 50 mV center dot s(-1)) being retained after 20,000 cycles. With respect to the assembled hybrid supercapacitor, honeycomb-like Ni(OH)(2) also displayed superior electrochemical performance, with a high energy density (83.9 Wh center dot kg(-1) at a power density of 374.8 W center dot kg(-1)). The outstanding electrochemical performance of Ni(OH)(2) should be attributed to its unique honeycomb-like structure, with a very high specific surface area, which greatly accelerates the transformation and diffusion of active ions.
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