祝贺陈锡安老师和黄少铭老师在 journal of power sources上发表学术论文-威尼斯人888

reduced graphene oxide/carbon nanotube/α-ni(oh)₂ (rgo/cnt/α-ni(oh)₂) composites are successfully synthesized by a one-pot hydrothermal route. the structural characterization of the composites by edx, xrd, ft-ir, xps, raman, fesem and tem indicate that α-ni(oh)₂ nanoparticles with the size around 5 nm are randomly decorated onto three-dimensional (3d) hierarchical structure rgo/cnt. the electrochemical performances of the composites are evaluated by cyclic voltammogram, galvanostatic charge-discharge and electrochemical impedance spectroscopy. interestingly, it is found that the electrochemical capacitance of the composites depends on the amount of cnts to a large extent and rgo/cnt/α-ni(oh)₂ composite (gc2ni2) with optimized ratio exhibits the high specific capacitance of 1320 f g⁻¹ at 6 a g⁻¹. in addition, the cycling measurements show that gc2ni2 maintains a specific capacitance of 1008 f g⁻¹ at 15 a g⁻¹ after 1000 cycles corresponding to a reduction of capacitance of about 7.8%. the enhancement in specific capacitance and cycling stability is believed to be due to the 3d rgo/cnt conductive network which promotes not only efficient charge transport and facilitates the electrolyte diffusion, but also prevents effectively the volume expansion/contraction and aggregation of electroactive materials during charge-discharge process. these impressive results suggest that the hybrid composite is a promising supercapacitor electrode material.