Cobaltous hydroxide nanorods were synthesized by solid-state chemical reactions of Co(Ac)2·4H2O, and NaOH at room temperature in the presence of polyethylene glycol 400 (PEG-400). The compositions and morphologie...Cobaltous hydroxide nanorods were synthesized by solid-state chemical reactions of Co(Ac)2·4H2O, and NaOH at room temperature in the presence of polyethylene glycol 400 (PEG-400). The compositions and morphologies of the products were characterized by XRD, TEM, IR and TG-DTA. The results show that Co(OH)2 nanorods can be obtained only in one-step by means of surfactant-assisted soft-template solid-state chemical reaction method. The surfactant (PEG-400) plays a soft-template like role in the process of Co(OH)2 nanorods formation and leads nanocrystallines to grow along certain direction into nanorods.展开更多
CoAl LDHs with different molar ratio of Ni have been prepared by chemical co -precipitation method.XRD results show that these materials have layered struc tures.Electrochemical tests show that Co(Ni)Al LDHs as electr...CoAl LDHs with different molar ratio of Ni have been prepared by chemical co -precipitation method.XRD results show that these materials have layered struc tures.Electrochemical tests show that Co(Ni)Al LDHs as electrode material hav e typical capacit ive properties in a wide voltage range of0.0to0.6V;Co(Ni)Al LDH(Ni∶Co =4∶6)as an electrode material has the highest capacitance of960F · g -1 and good cycling performance.But the poor capacitive properties of NiAl LDH electrode are showed in a narrow voltage range of0.3to0.55V.展开更多
Carbon nanotubes with arylsulfonic acid groups were prepared using azobisisobutyronitrile as an initiator via the surface modification of carbon nanotubes by aminobenzenesulfonic acid in fuming sulfuric acid. The elec...Carbon nanotubes with arylsulfonic acid groups were prepared using azobisisobutyronitrile as an initiator via the surface modification of carbon nanotubes by aminobenzenesulfonic acid in fuming sulfuric acid. The electrochemical performances of the functional multi-wall carbon nanotubes used as active electrode materials were tested with cyclic voltammetry and galvanostatic charge-discharge. The results show that the functional multi-wall carbon nanotubes electrodes exhibit larger capacitance. The specific capacitance has been enchanced up to 50 F·g-1 at 3 mA discharging compared to that of carbon nanotubes coped with fuming sulfuric acid (22 F·g-1 at 3 mA) and carbon nanotubes without treatment (15 F·g-1 at 3 mA).展开更多
文摘Cobaltous hydroxide nanorods were synthesized by solid-state chemical reactions of Co(Ac)2·4H2O, and NaOH at room temperature in the presence of polyethylene glycol 400 (PEG-400). The compositions and morphologies of the products were characterized by XRD, TEM, IR and TG-DTA. The results show that Co(OH)2 nanorods can be obtained only in one-step by means of surfactant-assisted soft-template solid-state chemical reaction method. The surfactant (PEG-400) plays a soft-template like role in the process of Co(OH)2 nanorods formation and leads nanocrystallines to grow along certain direction into nanorods.
文摘CoAl LDHs with different molar ratio of Ni have been prepared by chemical co -precipitation method.XRD results show that these materials have layered struc tures.Electrochemical tests show that Co(Ni)Al LDHs as electrode material hav e typical capacit ive properties in a wide voltage range of0.0to0.6V;Co(Ni)Al LDH(Ni∶Co =4∶6)as an electrode material has the highest capacitance of960F · g -1 and good cycling performance.But the poor capacitive properties of NiAl LDH electrode are showed in a narrow voltage range of0.3to0.55V.
文摘Carbon nanotubes with arylsulfonic acid groups were prepared using azobisisobutyronitrile as an initiator via the surface modification of carbon nanotubes by aminobenzenesulfonic acid in fuming sulfuric acid. The electrochemical performances of the functional multi-wall carbon nanotubes used as active electrode materials were tested with cyclic voltammetry and galvanostatic charge-discharge. The results show that the functional multi-wall carbon nanotubes electrodes exhibit larger capacitance. The specific capacitance has been enchanced up to 50 F·g-1 at 3 mA discharging compared to that of carbon nanotubes coped with fuming sulfuric acid (22 F·g-1 at 3 mA) and carbon nanotubes without treatment (15 F·g-1 at 3 mA).
