MnO_2/Ni(OH)_2@Ni复合电极材料的绿色制备技术
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摘要
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 MnO_2/Ni(OH)_2@Ni composite electrode material.In the hydrothermal system,the structure and electrochemical performances of MnO_2/Ni(OH)_2@Ni composite electrode material were analyzed at different reaction temperatures,using MnCl_2·4H_2O,H_2O_2 and foamed nickel as raw materials.The uniform MnO_2/Ni(OH)_2 nanosheets were successfully grown on Ni foam at 90℃for only 3h.The test result shows that the prepared MnO_2/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).
A fast and mild green preparation technique was presented,aiming at the complex preparation process of MnO_2/Ni(OH)_2@Ni composite electrode material.In the hydrothermal system,the structure and electrochemical performances of MnO_2/Ni(OH)_2@Ni composite electrode material were analyzed at different reaction temperatures,using MnCl_2·4H_2O,H_2O_2 and foamed nickel as raw materials.The uniform MnO_2/Ni(OH)_2 nanosheets were successfully grown on Ni foam at 90℃for only 3h.The test result shows that the prepared MnO_2/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).
引文
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[3]练慧勤,王建明,常晓途,等.钴取代α-Ni(OH)2的结构和电化学性能[J].浙江大学学报:工学版,2008,42(7):1223-1226.LIAN Hui-qin,WANG Jian-ming,CHANG Xiao,et al.Structure and electrochemical performance of cobalt substituted alpha nickel hydroxide[J].Journal of Zhejiang University:Engineering Science,2008,42(7):1223-1226.
[4]ZHOU Q,CUI M,TAO K,et al.High areal capacitance three-dimensional Ni@Ni(OH)2foams via in situ oxidizing Ni foams in mild aqueous solution[J].Applied Surface Science,2016,365:125-130.
[5]WALLAR C,LUO D.Manganese dioxide-carbon nanotube composite electrodes with high active mass loading for electrochemical supercapacitors[J].Journal of Materials Science,2017,52(7):3687-3696.
[6]DANG WH,DONG CJ,ZHANG ZF.Self-grown MnO2 nanosheets on carbon fiber paper as high performance supercapacitors electrodes[J].Electrochimica Acta,2016,217:16-23.
[7]CHEN H,HU L,YAN Y,et al.One-step fabrication of ultrathin porous nickel hydroxide-manganese dioxide hybrid nanosheets for supercapacitor electrodes with excellent capacitive performance[J].Advanced Energy Materials,2013,3(12):1636-1646
[8]SAhA S,CHHETRI S,KHANRA P,et al.In-situ hydrothermal synthesis of MnO2/NiO@Ni hetero structure electrode for hydrogen evolution reaction and high energy asymmetric supercapacitor applications[J].Journal of Energy Storage,2016,6:22-31.
[9]WANG Z,WANG F,TU J,et al.Nickel foam supported hierarchical mesoporous MnO2/Ni(OH)2 nanosheet networks for high performance supercapacitor electrode[J].Materials letters,2016,171:10-13.