A novel strategy, which is better-suited for preparing materials with a very microscopic structure, is described and the whisker-like composite of Co(OH) 2/HY was prepared by using this strategy. In addition, the mech...A novel strategy, which is better-suited for preparing materials with a very microscopic structure, is described and the whisker-like composite of Co(OH) 2/HY was prepared by using this strategy. In addition, the mechanism by which the growth proceeds is not very rigorously worked out. Due to the high dispersed capability of HY towards to Co(OH) 2 resulting in loose whisker-like microstructure of Co(OH) 2, small channels become available for the diffusion of OH - electrolyte ions through all Co(OH) 2 thin layer. Consequentially, the prepared composite shows a very high specific capacitance (483 F/g) and utilization (93%) of effective electroactive composition of composite.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
A series of ordered mesoporous carbons have been synthesized via a simple template method using mesopore silica molecular sieve SBA-15 as template and commercial available phenol-formaldehyde resin as carbon precursor...A series of ordered mesoporous carbons have been synthesized via a simple template method using mesopore silica molecular sieve SBA-15 as template and commercial available phenol-formaldehyde resin as carbon precursor. The samples were characterized by X-ray diffraction(XRD), transmission electron microscopy (TEM) and nitrogen adsorption. The order and the specific surface area of the mesoporous carbon can be adjusted by the concentration of the resin. When the concentration was fixed at 0.15 g·mL-1, the highest order and the largest specific surface area of 1 017 m2·g-1 were obtained. The Cyclic Voltammetry(CV)test result shows that the specific capacitance of C0.15 sample is 222 F·g-1, when the scanning rate is 2 mV·s-1; and 159 F·g-1 when the scanning rate increases to 50 mV·s-1. Due to the differences of the pore structure, the ordered mesoporous carbons have better electrochemical capacitance than the activated carbon.展开更多
文摘A novel strategy, which is better-suited for preparing materials with a very microscopic structure, is described and the whisker-like composite of Co(OH) 2/HY was prepared by using this strategy. In addition, the mechanism by which the growth proceeds is not very rigorously worked out. Due to the high dispersed capability of HY towards to Co(OH) 2 resulting in loose whisker-like microstructure of Co(OH) 2, small channels become available for the diffusion of OH - electrolyte ions through all Co(OH) 2 thin layer. Consequentially, the prepared composite shows a very high specific capacitance (483 F/g) and utilization (93%) of effective electroactive composition of composite.
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A series of ordered mesoporous carbons have been synthesized via a simple template method using mesopore silica molecular sieve SBA-15 as template and commercial available phenol-formaldehyde resin as carbon precursor. The samples were characterized by X-ray diffraction(XRD), transmission electron microscopy (TEM) and nitrogen adsorption. The order and the specific surface area of the mesoporous carbon can be adjusted by the concentration of the resin. When the concentration was fixed at 0.15 g·mL-1, the highest order and the largest specific surface area of 1 017 m2·g-1 were obtained. The Cyclic Voltammetry(CV)test result shows that the specific capacitance of C0.15 sample is 222 F·g-1, when the scanning rate is 2 mV·s-1; and 159 F·g-1 when the scanning rate increases to 50 mV·s-1. Due to the differences of the pore structure, the ordered mesoporous carbons have better electrochemical capacitance than the activated carbon.
基金Program for New Century Excellent Talents in U.,China M inistry of Edn.(NCET-10-0768,NCET-13-0643)National Natural Science Foundation of China(U1361110,51172285,51372277)~~
