采用异质自组装法制备得到氧化石墨烯/Ni(HCO3)2(GO/Ni(HCO3)2),经热还原分解后得到石墨烯/NiO(rGO/NiO)。通过XRD、SEM和N 2吸脱附测试等手段详细研究了GO/Ni(HCO3)2向rGO/NiO转变过程中的结构变化,结果表明,rGO/NiO的比表面积和孔容...采用异质自组装法制备得到氧化石墨烯/Ni(HCO3)2(GO/Ni(HCO3)2),经热还原分解后得到石墨烯/NiO(rGO/NiO)。通过XRD、SEM和N 2吸脱附测试等手段详细研究了GO/Ni(HCO3)2向rGO/NiO转变过程中的结构变化,结果表明,rGO/NiO的比表面积和孔容分别为121.3 m^2 g^-1和0.26 cm^3 g^-1,呈分级孔分布,孔径主要分布为2~100 nm。大的比表面积和分级孔的分布使得rGO/NiO呈现出优异的电化学性能。在0.5 A g^-1的电流密度下比电容是919 F g^-1。当电流密度从0.5 A g^-1提高至5 A g^-1时,比电容保持率为71%。长周期循环稳定性结果显示,在2 A g^-1的电流密度下循环3000次后比电容保持率为91%。展开更多
A kind of sandwich-like NiCo_2O_4/rGO/NiO heterostructure composite has been successfully anchored on nickel foam substrate via a three-step hydrothermal method with successive annealing treatment. The smart combinati...A kind of sandwich-like NiCo_2O_4/rGO/NiO heterostructure composite has been successfully anchored on nickel foam substrate via a three-step hydrothermal method with successive annealing treatment. The smart combination of NiCo_2O_4, reduced graphene oxide(rGO), and NiO nanostructure in the sandwich-like nano architecture shows a promising synergistic effect for supercapacitors with greatly enhanced electrochemical performance. For serving as supercapacitor electrode, the NiCo_2O_4/rGO/NiO heterostructure materials exhibit remarkable specific capacitance of 2644 mF cm^(-2)at current density of 1 mA cm^(-2),and excellent capacitance retentions of 97.5% after 3000 cycles. It is expected that the present heterostructure will be a promising electrode material for high-performance supercapacitors.展开更多
文摘采用异质自组装法制备得到氧化石墨烯/Ni(HCO3)2(GO/Ni(HCO3)2),经热还原分解后得到石墨烯/NiO(rGO/NiO)。通过XRD、SEM和N 2吸脱附测试等手段详细研究了GO/Ni(HCO3)2向rGO/NiO转变过程中的结构变化,结果表明,rGO/NiO的比表面积和孔容分别为121.3 m^2 g^-1和0.26 cm^3 g^-1,呈分级孔分布,孔径主要分布为2~100 nm。大的比表面积和分级孔的分布使得rGO/NiO呈现出优异的电化学性能。在0.5 A g^-1的电流密度下比电容是919 F g^-1。当电流密度从0.5 A g^-1提高至5 A g^-1时,比电容保持率为71%。长周期循环稳定性结果显示,在2 A g^-1的电流密度下循环3000次后比电容保持率为91%。
基金supported by the Special Fund for the Development of Strategic Emerging Industries of Shenzhen City of China(No.JCYJ20140419141154246)the National Nature Science Foundation of China(No.11174227)Chinese Universities Scientific Fund
文摘A kind of sandwich-like NiCo_2O_4/rGO/NiO heterostructure composite has been successfully anchored on nickel foam substrate via a three-step hydrothermal method with successive annealing treatment. The smart combination of NiCo_2O_4, reduced graphene oxide(rGO), and NiO nanostructure in the sandwich-like nano architecture shows a promising synergistic effect for supercapacitors with greatly enhanced electrochemical performance. For serving as supercapacitor electrode, the NiCo_2O_4/rGO/NiO heterostructure materials exhibit remarkable specific capacitance of 2644 mF cm^(-2)at current density of 1 mA cm^(-2),and excellent capacitance retentions of 97.5% after 3000 cycles. It is expected that the present heterostructure will be a promising electrode material for high-performance supercapacitors.
