择优取向对氢化TiO2纳米管阵列电化学性能的影响

The effect of preferred orientation on the electrochemical performance of hydrogenated TiO2 nanotube arrays

摘要:

氢化TiO2纳米管阵列具有良好的电化学性能，通过构筑TiO2<001>取向结构可进一步提高氢化TiO2纳米管阵列的电化学性能。本文以Ti为基底，通过调节阳极氧化法醇-水配比及高温退火工艺的方法制备了具有不同取向程度的锐钛矿型TiO2纳米管阵列，并对具有不同取向度的TiO2纳米管阵列进行相同工艺参数电化学氢化处理，利用SEM、XPS、XRD、TEM及电化学测试等表征手段研究了制备工艺对取向结构的影响以及取向结构对氢化TiO2纳米管阵列电化学性能的影响规律和作用机理。具有高度<001>择优取向结构的氢化TiO2纳米管阵列放电比容量达到了17.31 mF·cm-2，其优异的电化学性能主要归功于氢化与取向结构的协同效应。

Abstract:

Hydrogenated TiO2 nanotube arrays exhibit good electrochemical performance, which can be further improved by constructing anatase <001> preferred orientation structure within TiO2 nanotube arrays. The anatase TiO2 nanotube arrays with different degrees of <001> orientation via adjusting the Glycol-H2O ratio in anodization process and the subsequent annealing atmosphere. After electrochemical hydrogenation, the as-prepared samples with different degrees of <001> orientation were characterized by SEM, XPS, XRD, TEM and electrochemical measurements, the effects of preparation process on <001> orientated structure was investigated. The mechanism of the enhanced electrochemical properties by orientated structure orientation was discussed. The hydrogenated TiO2 nanotube arrays with highly <001> orientation delivered the charge specific capacitance as high as 17.31 mF·cm-2, which can attribute to the synergetic effects of hydrogenation and <001> oriented structure.