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 222 F/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 0.05C rate. The rate capability and cycling performance is also very promising as compared with the traditional graphite anode.
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。
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Foundation item: Project(JCYJ20170817110251498) supported by the Basic Research Project of the Science and Technology Innovation Commission of Shenzhen, China; Project(2016TQ03C919) supported by the Guangdong Special Support for the Science and Technology Leading Young Scientist, China; Projects(21603094, 21703096) supported by the National Natural Science Foundation of China
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Huo, Yf., Qin, N., Liao, Cz. et al. Hydrothermal synthesis and energy storage performance of ultrafine Ce2Sn2O7 nanocubes. J. Cent. South Univ. 26, 1416–1425 (2019). https://doi.org/10.1007/s11771-019-4097-4
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DOI: https://doi.org/10.1007/s11771-019-4097-4