采用醇辅助液相沉淀法,将MnO2纳米颗粒沉积在碳纳米管(CNTs)的表面,从而获得MnO2/CNTs复合材料。采用两种配料比将其制备成电极并组装成实验室模拟超级电容器,以循环伏安法、交流阻抗法、恒电流充放电法研究了电极在pH=3的Na2SO4(1mol/L)、中性Na2SO4(1mol/L)、饱和LiNO3这3种不同电解液中超级电容性能。结果表明:乙炔黑作为电子导体比石墨的性能更好,在酸性电解液pH=3的Na2SO4中MnO2/CNTs比电容最高(169F/g),但循环过程中的容量保持能力较差。中性溶液中,电极在饱和LiNO3中表现出更高的比电容和循环能力。
The MnO2 nano particles were deposited on the surface of carbon nanotubes (CNTs) to obtain MnO2/CNTs composite by alcohol assisted liquid phase precipitation method.The two ingredient ratio was used to prepare the electrode and assemble into a supercapacitor.in laboratory.Using cyclic voltammetry,AC impedance method and constant current charge discharge method,the performance of the electrode in Na2SO4(1mol/L,pH=3),neutral Na2SO4(1mol/L) and saturated LiNO3 was studied.The results shown that the acetylene black was better than graphite as electronic conductor,MnO2/CNTs had the highest specific capacity(169F/g) in acidic electrolyte pH=3 of Na2SO4,but the capacity of the cycle was not good.Then in neutral solution,the electrode showed higher specific capacityand cycle ability.in saturated LiNO3.
[1] Li L C,Lafdi K.Composite films prepared by immersion deposition of manganese oxide in carbon nanotubes grown on graphite for supercapacitors[J].Journal of Materials Science,2011(46):7328-7334.
[2] Subramanian V,Zhu Hongwei,Wei Bingqing.Nanostructured manganese oxides and their composites with carbon nanotubes as electrode materials for energy storage devices[J].Pure and Applied Chemistry,2008,80(11):2327-2343.
[3] Solero L,Lidozzi A,Serrao V,et al.Ultraea paeitorsfor fu saving in small size hybrid vehieles[J].Journal of Power Source,2011,196(l):587-595.
[4] 程杰,张文峰,张浩,等.高比能量电化学电容器及材料的进展[J].电池,2008,38(5):317-320.
[5] Ghodbane O,Pascal J L,Favier F.Microstructural effects on charge-storage properties in MnO2-based electrochemical supercapacitors[J].Applied Materials ＆ Interfaces,2009,1(5):1130-1139.
[6] 曾双双,郑明森,董全峰.直接还原高锰酸钾制备CNT/MnO2复合材料[J].电池,2010,40(3):121-123.
[7] 邓梅根,杨邦朝,胡永达.活化和MnO2沉积提高碳纳米管超级电容器的性能[J].功能材料,2005,36(3):408-410.
[8] Stoller M D,Ruoff R S.Review of best practice methods for determining an electrode material's performance for ultracapacitors[J].Energy Environmental Science,2010(3):1294-1301.
