Flower-shaped Co3O4 nanorods directly grown on nickel foam（Co3O4/NF） were prepared by one step hy-drothermal method at low temperature. Co3O4 nanorods are directly connected with the nickel foam, and no binder is ne...Flower-shaped Co3O4 nanorods directly grown on nickel foam（Co3O4/NF） were prepared by one step hy-drothermal method at low temperature. Co3O4 nanorods are directly connected with the nickel foam, and no binder is needed as an additive, so the Co3O4NF electrode has good electrical conductivity. This flower-shaped structure makes larger surface area of Co3O4 nanorods that exposes to the electrolyte, thus promoting the redox reaction. The Co3O4/NF electrode shows a high specific capacitance of 2005.34 F/g at the current density of 0.5 A/g and a high capacitance retention of 98.0% after 5000 cycles. The high superior capacitive performance with high specific capacitance and the excellent cyclic performance indicate that the one step hydrothermal method has great potential application in supercapacitors.展开更多
基金Supported by the National Natural Science Foundation of Chma（Nos. 51364024, 51404124） and the Foundation for Innovation Groups of Basic Research in Gansu Province, China（No. 1606RJIA322）.
文摘Flower-shaped Co3O4 nanorods directly grown on nickel foam（Co3O4/NF） were prepared by one step hy-drothermal method at low temperature. Co3O4 nanorods are directly connected with the nickel foam, and no binder is needed as an additive, so the Co3O4NF electrode has good electrical conductivity. This flower-shaped structure makes larger surface area of Co3O4 nanorods that exposes to the electrolyte, thus promoting the redox reaction. The Co3O4/NF electrode shows a high specific capacitance of 2005.34 F/g at the current density of 0.5 A/g and a high capacitance retention of 98.0% after 5000 cycles. The high superior capacitive performance with high specific capacitance and the excellent cyclic performance indicate that the one step hydrothermal method has great potential application in supercapacitors.
