SnO2@TiO2 Heterojunction Nanostructures for Lithium-Ion Batteries and Self-Powered UV Photodetectors with Improved Performances
SnO2@TiO2 Heterojunction Nanostructures for Lithium-Ion Batteries and Self-Powered UV Photodetectors with Improved Performances
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DOI：
10.1002/celc.201300053
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发表时间：
2014-01-03
期刊：
影响因子：
4
通讯作者：
Shen, Guozhen
中科院分区：
文献类型：
--
作者：
Hou, Xiaojuan;Wang, Xianfu;Shen, Guozhen
为克服锂离子电池SnO 2负极材料循环稳定性和倍率容量较差的问题，探索了一种有效的制备方法，即制备由金红石型SnO 2纳米颗粒和金红石型TiO 2纳米棒组成的杂化材料，既考虑了小的晶格失配以获得更好的复合晶格结构，又考虑了它们在电化学性能方面的上级协同效应。所制备的SnO2@TiO2材料直接形成在碳布上作为无粘合剂的阳极，在200 mAg（-1）下100次放电/充电循环后表现出700 mAhg（-1）的可逆容量，以及优异的循环稳定性和倍率容量。在高温下煅烧后，所产生的中空SnO2@TiO2杂化微管直接用于制备光电化学（PEC）紫外探测器，用于未来具有自供电功能的器件。观察到0.1 mAcm（-2）的高光电流响应，以及优异的自供电和快速响应以及“可见盲”特性。这种杂化材料可以在锂离子电池中实现互补效应，并在光伏器件中实现上级带隙匹配，因此可以扩展到染料敏化太阳能电池和超级电容器等应用。
To overcome the issue of inferior cycling stability and rate capacity for SnO2 anode materials in lithium-ion batteries, an effective strategy is explored to prepare a hybrid material consisting of rutile SnO2 nanoparticles and rutile TiO2 nanorods, considering not only the small lattice mismatch to achieve a better composited lattice structure but also their superior synergistic effect in electrochemical performances. The as-prepared SnO2@TiO2 material, directly formed on a carbon cloth as a binder-free anode, exhibits a reversible capacity of 700 mAhg(-1) after 100 discharge/charge cycles at 200 mAg(-1), as well as excellent cycling stability and rate capacity. After being calcinated at high temperature, the produced hollow SnO2@TiO2 hybrid microtubes were directly used to fabricate photoelectrochemical (PEC) UV detectors for future devices with self-powered function. A high photocurrent response of 0.1 mAcm(-2) was observed, together with an excellent self-powered and fast response and "visible blind" characteristics. Such a hybrid material could achieve a complementary effect in lithium-ion batteries and a superior band gap match in photovoltaic devices, and could consequently be extended to applications such as dye-sensitized solar cells and supercapacitors.