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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Mechanism of Li~+/Electron Conductivity in Rutile and Anatase TiO2 Nanoparticles
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Mechanism of Li~+/Electron Conductivity in Rutile and Anatase TiO2 Nanoparticles

机译:金红石和锐钛矿型TiO2纳米粒子中Li〜//电导率的机理

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摘要

Concurrent Li ion and electron conductivity in rutile and anatase TiO2 nanoparticles was studied using multiscale simulations. We show that charge transport in titania nanoparticles is determined by the competition of charge redistribution toward the particle boundaries and constant Li~+ and electron fluxes. In nanoparticles smaller than the Debye length, the constant flux prevails and the conductivity has a dual ionic and electronic character, while for larger nanoparticles conductivity becomes predominately ionic. Simulations revealed that the temperature dependence of Li ion conductivity in anatase is very weak, while in rutile the conductivity decreases with temperature in small nanoparticles and increases in large nanoparticles.
机译:使用多尺度模拟研究了金红石型和锐钛矿型TiO2纳米粒子中的并发锂离子和电子电导率。我们表明二氧化钛纳米粒子中的电荷传输是由电荷向粒子边界重新分布的竞争以及恒定的Li〜+和电子通量决定的。在小于Debye长度的纳米颗粒中,恒定通量占主导地位,电导率具有离子和电子双重特征,而对于较大的纳米颗粒,电导率主要变为离子性。模拟表明,锐钛矿中锂离子电导率的温度依赖性非常弱,而在金红石中,电导率随小纳米粒子的增加而降低,而随着大纳米粒子的增加而升高。

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