With the silanized porous anodic alumina（PAA） as a templates, an array of concentric composite nanostructures of Ni nanotubes/γ-Fe2O3 nanowires were prepared by electrodeposition and chemical precipitation. The mic...With the silanized porous anodic alumina（PAA） as a templates, an array of concentric composite nanostructures of Ni nanotubes/γ-Fe2O3 nanowires were prepared by electrodeposition and chemical precipitation. The microstructure of the nanowires and nanotubes was studied by employing the transmission electron mircoscope（TEM） and X-ray diffraction（XRD） techniques respectively. The results show that the diameter of composite nanowires is about 50 nm, the shell of the composite nanowires is the amorphous Ni nanotuble with a thickness from 4-15 nm by varying electrodeposition parameters and it coats a polycrystalline γ-Fe2O3 core.展开更多
A homogeneous better-dispersed ultrathin nanosheets（ca. 5 nm） of cobalt-nickel layered double hydroxides（LDH） supported on nickel foam scaffold was synthesized using controllable electrodeposition approach for hig...A homogeneous better-dispersed ultrathin nanosheets（ca. 5 nm） of cobalt-nickel layered double hydroxides（LDH） supported on nickel foam scaffold was synthesized using controllable electrodeposition approach for high efficiency electrode materials of new supercapacitor. The morphology and electrochemical performances of the samples can be controlled by adjusting the precursor ratio, i.e., Ni（OAc）2/Co（NO3）2 molar ratio in the electrodeposition approach. With the increase of this molar ratio, the electrochemical performances give a volcano trend. When the optimized molar ratio is 0.64/0.36, the hybrid delivered a high specific capacitance of 1587.5 F g-1 at a current density of 0.5 A g-1, with good rate capability（1155 F g-1 was retained even at 10 A g-1） and a robust recycle stability（remaining 91.5% after 1000 cycles at 5 A g-1）. The good performance could be attributed to the enlarged interlayer spacing, ultrathin nanosheets and synergistic effects between Co（OH）2 and Ni（OH）2. Furthermore, an asymmetric supercapacitor with a high energy density of 34.5 Wh kg-1 at 425 W kg-1 and excellent cycling stability of 85.4% after 5000 charge-discharge cycles at 2 A g-1 was fabricated. We believe that this fantabulous new electrode material would have encouraging applications in electrochemical energy storage and a wide readership.展开更多
文摘With the silanized porous anodic alumina（PAA） as a templates, an array of concentric composite nanostructures of Ni nanotubes/γ-Fe2O3 nanowires were prepared by electrodeposition and chemical precipitation. The microstructure of the nanowires and nanotubes was studied by employing the transmission electron mircoscope（TEM） and X-ray diffraction（XRD） techniques respectively. The results show that the diameter of composite nanowires is about 50 nm, the shell of the composite nanowires is the amorphous Ni nanotuble with a thickness from 4-15 nm by varying electrodeposition parameters and it coats a polycrystalline γ-Fe2O3 core.
基金supported by the National Natural Science Foundation of China (21476145)
文摘A homogeneous better-dispersed ultrathin nanosheets（ca. 5 nm） of cobalt-nickel layered double hydroxides（LDH） supported on nickel foam scaffold was synthesized using controllable electrodeposition approach for high efficiency electrode materials of new supercapacitor. The morphology and electrochemical performances of the samples can be controlled by adjusting the precursor ratio, i.e., Ni（OAc）2/Co（NO3）2 molar ratio in the electrodeposition approach. With the increase of this molar ratio, the electrochemical performances give a volcano trend. When the optimized molar ratio is 0.64/0.36, the hybrid delivered a high specific capacitance of 1587.5 F g-1 at a current density of 0.5 A g-1, with good rate capability（1155 F g-1 was retained even at 10 A g-1） and a robust recycle stability（remaining 91.5% after 1000 cycles at 5 A g-1）. The good performance could be attributed to the enlarged interlayer spacing, ultrathin nanosheets and synergistic effects between Co（OH）2 and Ni（OH）2. Furthermore, an asymmetric supercapacitor with a high energy density of 34.5 Wh kg-1 at 425 W kg-1 and excellent cycling stability of 85.4% after 5000 charge-discharge cycles at 2 A g-1 was fabricated. We believe that this fantabulous new electrode material would have encouraging applications in electrochemical energy storage and a wide readership.
