In situ synthesis of two-dimensional Co2+-doped β-Ni(OH)2 using nickel complex as template for application in supercapacitors
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2D nanostructured Co2+-doped β-Ni(OH)2 as electrode material for application in redox-type supercapacitors was synthesized by a strategy of nickel complex template. The 2D Co2+-doped β-Ni(OH)2 was produced by the in situ reaction of 2D Co2+-doped template in strong alkaline electrolyte solution during electrochemical measurement. Due to the large interface and the promoted conductivity induced by Co2+ doping, the Co2+-doped β-Ni(OH)2 exhibited high electrochemical performance. It had high specific capacitance of about 2100 F g–1 at low current density of ~2 A g−1. It also exhibited excellent high rate performance (1259 F g–1 at high current density of 41.7 A g−1), much higher than the undoped sample. The results in this work indicated that the Co2+-doped β-Ni(OH)2 could be used as an effective electrode material in redox supercapacitors.
2D-structured Co2+-doped β-Ni(OH)2 was synthesized by a complex template strategy.
The template was formed through the precipitation reaction in solution at 80 °C.
The template was doped with Co2+ ions through a solvothermal reaction.
Co2+-doped β-Ni(OH)2 was in situ produced from template during the electrochemical test.
Co2+-doped β-Ni(OH)2 exhibited excellent high rate performance due to Co2+ doping.
KeywordsCo2+-doped β-Ni(OH)2 Template In situ synthesis Supercapacitors
We acknowledge the National Natural Science Foundation of China Grant No. 21606226.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
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