氢氧化镍/还原氧化石墨烯复合物的超级电容性能∗

摘要

采用共沉淀法制备了氢氧化镍/还原氧化石墨烯复合材料,并以此为电极研究了其超级电容性能.实验发现,六方氢氧化镍纳米片被成功插入到还原氧化石墨烯的层间,这有效抑制了还原氧化石墨烯和氢氧化镍的团聚,提高了电极的稳定性.当氢氧化镍和还原氧化石墨烯的质量比为5．5∶1时,显示了最佳的电化学性能：在－0．1~0．37 V 的电位窗口,1 A/g 的电流密度下,比电容高达1036 F/g；4 A/g 的电流密度下快速循环3000次后,仍然保持70％的比电容.%In this paper,composites of Ni(OH)2/reduced graphene oxides (rGO)were prepared by chemical co-precipitation method,by which Ni(OH)2 hexagonal nanoplates were successfully inserted into the layers of re-duced graphene oxides.As a result,the aggregation of rGO and Ni(OH)2 is efficiently prevented and the stabili-ty of the composites are also improved.The electrochemical performance of Ni(OH)2/rGO is further investiga-ted as electrode materials for supercapacitors.We find that when the mass ratio of Ni(OH)2 to rGO is 5.5∶1, the composites achieve the best electrochemical performance (optimal specific capacitance of 1 036 F/g has been achieved at a current density of 1 A/g).In addition,the value of capacitance retention is above 70% after 3 000 cycles at the current density of 4 A/g.