摘要
超级电容器具有充放电时间短、功率密度大、循环寿命长等特点,是一种应用前景广泛的新型储能器件。提高超级电容器性能的关键是开发具有优异电化学性能的电极材料。MoS_2因其类石墨烯的层状结构以及较高的理论容量得到广泛关注。但是MoS_2的层与层间导电性差,限制了其比电容的发挥。以导电性较高的导电聚合物与MoS_2复合是解决这一问题的有效途径。在本项研究中,我们制备了具有多级结构的MoS_2/PANI纳米复合材料。经表征发现,聚苯胺嵌入MoS_2层间,使(002)晶面间距由0.61 nm扩展到0.92 nm。聚苯胺与MoS_2的复合提高了材料的导电性,而扩展的层间距有利于离子的嵌入/脱出,因此MoS_2/PANI复合材料表现出优秀的电化学性能。在2A/g的电流密度下,其比电容为415F/g,经过15000次循环,比电容还可保持首次循环的77%。
Supercapacitors have attracted widely attention because of their high power density,fast charge-discharge ability and long cycle life.As a promising supercapacitor electrode material,MoS_2 has great theoretical capacity and enormous specific surface area.However,the conductivity between MoS_2 layers is low,which hinders the delivery of supercapacitance.Herein,we designed and prepared hierarchical MoS_2/PANI nanocomposite which were composed of nanosheets.The obtained MoS_2/PANI nanocomposite have an expanded interplanar spacing between(002) planes due to the intercalation of PANI.The hybridization with PANI enhances the conductivity of the composite and the expanded interplanar spacing facilitates the diffusion of ions in the active material.Therefore,the MoS_2/PANI composite exhibits high capacity and long cycle life.At a current density of 2A/g,it exhibits a specific capacitance of 415F/g,and maintained 77%of the capacitance even after 15000 times.
引文
