纳米MnO2/MoS2复合材料的制备及其电化学性能  

Preparation and Electrochemical Properties of Nanostructured MnO2/MoS2 Composites

作　　者：杨扬 传秀云[1] 李爱军[1] 程思雨 YANG Yang;CHUAN Xiuyun;LI Aijun;CHENG Siyu(Key Laboratory of Orogenic Belts and Crustal Evolution,School of Earth and Space Sciences,Peking University,Beijing 100871,China)

机构地区：[1]北京大学地球与空间科学学院造山带与地壳演化教育部重点实验室

出　　处：《材料科学与工程学报》2019年第6期861-866,870,共7页Journal of Materials Science and Engineering

基　　金：国家自然科学基金资助项目(51274015);国家重点基础研究发展计划资助项目(973)(2014CB846000);北京大学开放测试基金资助项目(0000012321)

摘　　要：采用液相沉积法在二硫化钼(MoS2)上负载二氧化锰(MnO2)以获得更好的电化学性能,利用多技术表征了样品的物相和形貌,并利用低温氮吸附BET模型测试了样品的比表面积和孔容。结果表明,复合材料继承了MoS2的球花状形貌,大量MnO2纳米颗粒沉积在纳米MoS2片层表面和充填于层间,增大了材料的比表面积和孔容。电化学测试表明:在1mol·L^-1Na2SO4电解液中,复合材料的比电容可达265.7F·g^-1(电流密度为0.3A·g^-1),界面转移电阻Rct约为1.64Ω;经过1000次循环充放电,比电容保持率达92.3%,说明复合材料具有良好的电化学性能。Manganese dioxide(MnO2)was deposited on molybdenum disulfide(MoS_2)nanosheets via liquid phase deposition(LPD)to enhance the electrochemical performance.The material phase,morphology,specific surface area and pore volume of the samples were characterized and measured experimentallyThe results indicate that the composite material inherits the spherical flower-like morphology of MoS_2.In addition,a large number of the MnO2 nanoparticles deposited onto the surface of the MoS2 nanosheets are intercalated within its layers,thus enhancing the specific surface area and pore volume of the material.The electrochemical properties of the samples were also tested.In 1 mol·L^-1Na2SO4 electrolyte,the composite material has a single electrode specific capacitance of 265.7 F·g^-1(with a current density of 0.3 A·g^-1),and a charge transfer resistance(Rct)of 1.64Ω;the capacitance of the material remains at 92.3%after 1000 charge-discharge cycles.It is demonstrated that the composite material synthesized in this study exhibits an excellent electrochemical performance.

关 键 词：电化学性能 复合材料 二硫化钼 二氧化锰 

分 类 号：TQ152[化学工程—电化学工业]