NF/rGO/Co_3O_4/NiO电极的制备及在超级电容器中的应用

以泡沫镍(NF)为集流体,在优化好的电位、时间和浓度下,将还原氧化石墨烯(rGO)、金属氧化物(Co_3O_4和NiO)直接生长在泡沫镍上,制备了NF/rGO/Co_3O_4和NF/rGO/Co_3O_4/NiO电极.运用三电极体系对电极材料进行了恒流充放电(GCD)和交流阻抗(EIS)等测试.结果表明,复合材料NF/rGO/Co_3O_4/NiO具有较高的比容量(电流密度为2 A/g时,比容量达到1188.6 F/g)和较好的循环稳定性(2000周充放电后,稳定性达到80.5%).该材料还具有较高的倍率性能,当电流密度由2 A/g增至12 A/g时,倍率性能仍能达到75.7%.

Preparation of NF/rGO/Co3O4/NiO Electrode and Its Application in Supercapacitor

The electrochemical deposition method was used to prepare NF/rGO/Co3 O4 and NF/rGO/Co3 O4/NiO electrodes( NF=nickel foam; rGO=reduced graphene oxide ) . Here, with NF as a current collector, rGO, Co3 O4 and NiO were grown on NF directly without any binder under specific conditions including optimized potential, time and concentration. NF/rGO/Co3 O4 and NF/rGO/Co3 O4/NiO electrodes were used as the electrode of supercapacitor, and three-electrode system was employed in cyclic voltammetry, galvanostatic charge-discharge and electrochemical impe-dance spectroscopy characterization of the electrodes. The results showed that the capacitance of NF/rGO/Co3 O4/NiO electrode was 1188. 6 F/g at 2 A/g; its rate capability was 75. 7% when the current density varied from 2 A/g to 12 A/g;and its cycling stability was 80. 5% after 2000 times. Compared with NF/rGO/Co3 O4 , the supercapacitor performance of NF/rGO/Co3 O4/NiO electrode improved a lot, which can be attributed to the synergistic effect of Co3O4 and NiO. What' s more, rGO could enhance the electroconductivity of electrodes to a large extent.