MnO_2/Ni(OH)_2@Ni复合电极材料的绿色制备技术

Green preparation technique to fabricate MnO_2/Ni(OH)_2@Ni composite electrode material

针对MnO_2/Ni(OH)_2@Ni复合电极材料制备工艺复杂的问题,提出快速温和的绿色制备技术.以MnCl_2·4H_2O、H_2O_2和泡沫镍为原料,水热体系下研究不同反应温度对MnO_2/Ni(OH)_2@Ni复合电极材料结构、电化学性能的影响.结果表明,在反应温度90℃、水热3h,成功在泡沫镍上沉积分布均一的MnO_2/Ni(OH)_2纳米片.测试结果表明,在该条件下制备的MnO_2/Ni(OH)_2@Ni电极材料展现出优异的电性能,即高的比容量(电流密度为2.5mA/cm^2,放电比容量为7.4F/cm^2)、好的倍率性能、好的循环稳定性(充放电循环500次,容量保持率为78%).

A fast and mild green preparation technique was presented,aiming at the complex preparation process of MnO2/Ni（OH）2@Ni composite electrode material.In the hydrothermal system,the structure and electrochemical performances of MnO2/Ni（OH）2@Ni composite electrode material were analyzed at different reaction temperatures,using MnCl2·4H2O,H2O2 and foamed nickel as raw materials.The uniform MnO2/Ni（OH）2 nanosheets were successfully grown on Ni foam at 90℃for only 3h.The test result shows that the prepared MnO2/Ni（OH）2@Ni electrode material in this condition has the good electrochemical performance,including high specific capacitance（2.5mA/cm^2,7.4F/cm^2）,the good rate capability and the good cycling stability（the capacitance retention of 78%after 500cycles）.