纳米MoS_2及MoS_2-RGO纳米复合材料的制备与电化学性能研究

高性能电极材料的开发是推广新型储能器件的核心所在。二硫化钼(MoS_2)呈现类石墨烯结构,其二维层间具备良好的电荷储存能力。然而MoS_2本身导电性能较差,用于电极材料时需要与其它材料复合以提升导电性能。采用水热法,并分别选用抗坏血酸和硫脲作还原剂,制备得到两种不同形貌结构的纳米二硫化钼。以石墨烯为模板,采用水热法在石墨烯表面生长纳米结构MoS_2,制备得到二硫化钼-还原氧化石墨烯(MoS_2-RGO)纳米复合材料,通过循环伏安测试(CV)和恒电流充放电测试(CP)考察了复合材料的电化学性能。实验结果表明,MoS_2-RGO纳米复合材料呈现平面双电层电容性能,电流密度为1 A/g时,其比电容值达136.2 F/g。

Study on preparation and electrochemical properties of nano-MoS_2 and MoS_2-RGO nano-composites

The preparation of electrode material with good electrochemical properties is the key to promote the performance of new type energy storage device. Molybdenum disulfide (MoS 2) has the structure similar to grapheme. The interlayer of MoS 2 can store charge efficiently.However,the conductivity of MoS 2 is poor. In order to improve the conductivity of electrode,MoS 2 is need to compound with other materials. Two kinds of nano-MoS 2 with different morphology and structure were synthesized by hydrothermal method using ascorbic acid and thiourea as reducing agent,respectively. Using graphene as template,molybdenum disulfide-reduced graphene oxide (MoS 2-RGO) nano-composite was synthesized by hydrothermal method. The electrochemical properties were characterized by cyclic voltammetry and galvanostatic charge-discharge. The results show that MoS 2-RGO nano-composite appeared a double layer capacitance. The specific capacitance of MoS 2-RGO reached to 136.2 F/g at the current density of 1 A/g.