Herein we successfully synthesized a 3D highly porous NiO film electrode via a simple in situ method,and fabricated an additive-free NiO electrode for battery-type supercapacitor cathodes.The proposed strategy include...Herein we successfully synthesized a 3D highly porous NiO film electrode via a simple in situ method,and fabricated an additive-free NiO electrode for battery-type supercapacitor cathodes.The proposed strategy includes the in situ growth of the precursor film by a hydrothermal method followed by a poremaking step under annealing conditions.The crystallographic properties,morphology and porous structure of the as-made film electrode have been deeply investigated.The results show that the in situ synthesized NiO film possesses integrated advantages of a highly porous inherent structure,high specific surface area,stable framework and enhanced affinity/conductivity with substrates.As for electrochemical investigations,the as-obtained NiO film electrode exhibits enhanced capacity and excellent cycling stability for fast energy storage,and also presents good mechanical flexibility.The assembled asymmetric supercapacitor device exhibits substantially high energy density,and the LED indication test reveales the promising application value of NiO film products.展开更多
基金supported by the Natural Science Foundation of Hebei Province(No.B2015203350 and B2019203487)the National Science Foundation of China(No.21403187 and 21875206)+1 种基金the China Postdoctoral Science Foundation(No.2015M581314 and 2015T80229)the Research Foundation of Yanshan University(No.14LGA016 and B772).
文摘Herein we successfully synthesized a 3D highly porous NiO film electrode via a simple in situ method,and fabricated an additive-free NiO electrode for battery-type supercapacitor cathodes.The proposed strategy includes the in situ growth of the precursor film by a hydrothermal method followed by a poremaking step under annealing conditions.The crystallographic properties,morphology and porous structure of the as-made film electrode have been deeply investigated.The results show that the in situ synthesized NiO film possesses integrated advantages of a highly porous inherent structure,high specific surface area,stable framework and enhanced affinity/conductivity with substrates.As for electrochemical investigations,the as-obtained NiO film electrode exhibits enhanced capacity and excellent cycling stability for fast energy storage,and also presents good mechanical flexibility.The assembled asymmetric supercapacitor device exhibits substantially high energy density,and the LED indication test reveales the promising application value of NiO film products.
