三维石墨烯基Co-Ni双氢氧化物复合材料的制备及其电化学性能

摘要

石墨烯具有高的机械强度和大的比表面积。以石墨烯、硝酸镍和硝酸钴为原料，水合肼为还原剂，采用水热法制备了三维石墨烯基Co-Ni双氢氧化物（ GCN），用XRD、SEM、循环伏安、恒电流充放电测试方法对石墨烯和不同比例的GCN的结构和电化学性能进行表征研究。结果表明，在电流密度为1 A/g时，比容量可达1230 F/g，并且循环500周后，比容量仍能保持91.6%，有望成为超级电容器的电极材料。%Graphene has attracted intense attention,due to its high mechanical strength and large specific surface area,the three-dimension graphene-based Co-Ni double hydroxide( GCN)directly prepared by u-sing graphene oxide,Ni(NO3)2·6H2O and Co(NO3)2·6H2O as raw materials and hydrazine hydrate as reductant through hydrothermal method,the structure and electrochemical properties were characterized of the graphene and the different proportion of GCN by using XRD,SEM,cyclic voltage,constant current charge-discharge test. The results shows its specific capacitance is up to 1 230 F/g and remains at about 91. 6% of the initial value after 500 cycles at current density of 1 A/g,it is a promising electrode materi-als for supercapacitor.