新型纳米多孔铜/二氧化锰复合电极材料的制备及其比电容特性

Preparation and specific capacitance performance of a new nanoporous copper/manganese dioxide composite electrode material

利用快速凝固技术和脱合金相结合的方法制备纳米多孔铜,通过化学沉积法使二氧化锰沉积在纳米多孔铜上,成功制备了新型纳米多孔铜和二氧化锰的复合电极材料.用XRD和SEM分析了复合电极材料的相组成及微观形貌.通过循环伏安法和恒电流充放电测试研究了复合电极材料的电化学性能.结果表明:纳米多孔铜和二氧化锰复合材料因具有纯纳米多孔铜的三维连续孔洞结构及优异的导电性能而改善了纯二氧化锰易团聚、颗粒大、比电容值低的缺点,增大了电极活性物质的比表面积、提高了复合材料的导电性.其比电容性能提高到231 F/g,是纯二氧化锰电极的1.67倍.

New nanoporous copper/manganese dioxide（NPC/Mn O2） composites as a electrode material have been successfully synthesized by chemically depositing manganese dioxide（Mn O2） on nanoporous copper（NPC）. Nanoporous copper（NPC） can be made by free-corrosion dealloying a rapidly quenched Cu-Zr ribbon. The phases and microstructure of NPC and NPC/Mn O2 composite materials were analyzed by XRD and SEM. The electrochemical properties of the NPC/Mn O2 composite electrode materials were investigated by cyclic voltammetry and galvanostatic charge-discharge measurements. The results indicate that for the NPC-supported Mn O2 composites, the Mn O2 nanoflakes are homogeneously deposited on the surface of the NPC substrate rather than aggregate globular particles. Owing to the excellent electrical conductivity and 3D nanoporous structure of NPC, the specific surface area and the conductivity of the composites are improved when compared with the as-prepared Mn O2. Then, the utilization of Mn O2 surface active sites is improved,and the specific capacitance reaches to 231 F/g, which is 1.67 times than that of pure-Mn O2.