【摘要】 采用简单水热法合成了尺寸为10 nm左右的纯烧绿石相超细Ce₂Sn₂O₇立方晶体。通过优化温度、pH、反应时间、前驱体类型等参数获得最佳实验条件。通过X射线衍射仪、拉曼光谱、透射电子显微镜、高分辨透射电子显微镜和BET等表征技术对样品的晶体结构、形貌、尺寸和比表面积进行表征。将制备的Ce₂Sn₂O₇超细纳米立方晶体用作电极材料,并通过超级电容器和锂离子电池对其性能进行评估。将其应用于超级电容器,在0.1 A/g下具有222 F/g的高比电容,并且在5000次循环后仍具有良好的循环稳定性,电容保持率高于86%。将其用于锂离子电池负极材料时,在0.05C倍率下具有超过900 mA?h/g的高电池容量。与传统的石墨阳极相比,其倍率性能和循环性能呈现出较好的应用前景。更多还原

【Abstract】 Ultrafine cube-shape Ce₂Sn₂O₇ nanoparticles crystallized in pure pyrochlore phase with a size of about 10 nm have been successfully synthesized by a facile hydrothermal method. Conditional experiments have been conducted to optimize the processing parameters including temperature, pH, reaction duration, precipitator types to obtain phase-pure Ce₂Sn₂O₇. The crystal structure, morphology and sizes and specific surface area have been characterized by X-ray diffractometer（XRD）, Raman spectrum, transmission electron microscope（TEM）, high resolution transmission electron microscope（HRTEM）, and Brunauer-Emmett-Teller（BET）. The as-synthesized Ce₂Sn₂O₇ ultrafine nanocubes have been evaluated as electrode materials for pseudo-capacitors and lithium ion batteries. When testing as supercapacitors, a high specific capacitance of 222F/g at 0.1 A/g and a good cycling stability with a capacitance retention of higher than 86% after 5000 cycle have been achieved. When targeted for anode material for lithium ion batteries, the nanocubes deliver a high specific reversible capacity of more than 900 mA?h/g at 0.05 C rate. The rate capability and cycling performance is also very promising as compared with the traditional graphite anode.更多还原