层状过渡金属硫属化合物丰富的晶体化学特性、较高的比表面积、良好的结构柔性和功能可调性赋予了它们优异的电学和催化性能。Mo、Te的电负性的接近性和金属相/半导体相的能量相近性使得MoTe2的控制合成科学难度增加。本项目拟采用胶体化学方法控制合成MoTe2超薄纳米片，通过反应系统的还原气氛和配体的协同作用，选择性合成半导体相和金属相MoTe2，获得结构完美的2H@1T'同质异相结，显著提高电化学储能性能。以TEM, Raman, XPS等手段跟踪纳米片生长与相变过程，以球差电镜研究金属相和异相结的晶界、表面缺陷等精细结构，采用电化学超级电容表征储能性能。确立超薄纳米片缺陷、物相变化与性能的构效关系，阐明金属相的稳定机制，建立协同提高导电性和电化学活性的异相结材料制备技术，为设计高效稳定的新能源器件提供新思路。

Layered transition metal dichalcogenide compounds have rich crystal chemistry characteristics, high surface area, flexible structures and tunable function, affording them excellent electronic and catalytic performances. Compared to MoS2, The electronic negativity and energy proximity of metallic and semiconductor phase of MoTe2 increase the research difficulty on the synthesis of ultrathin MoTe2. This project will use colloidal chemistry method to controlled synthesize ultrathin nanosheets of MoTe2. The selective synthesis of semiconductor phase and metallic phase will be achieved by adjusting synergism of reductive atmosphere and ligands. Finally well-defined hetero-phase nanojuctions can be realized to signifianly enhance the electrochemical energy storage performance. We will track the growth of nanosheets, phase transformation by TEM, Raman, and XPS. Spherical aberration corrected Scanning Transmission Electron Microscope will be used to investigate defects, boundaris of ultrathin metallic phase and homojunctions. Electrochemical supercapacitor will be constructed to study their energy storage performance. The structure-property relationship between nanosheet defects, phase changes and performance will be established, and the stability mechanism of metallic phase will be clarified. Finally a preparation techniques of the synergetic enhancement of electronic conductivity and electrochemical activities for the energy storage and transformation should come true. The results can open a new avenue for the design of efficient and stable new energy devices.