多壁碳纳米管/TiO2纳米复合薄膜的光电性能研究

采用溶胶凝胶法制备了系列不同含量的多壁碳纳米管(MWCNT)/TiO₂纳米复合薄膜电极, 通过SEM和XRD表征了薄膜的形貌和晶型结构. 以1 mol/L KOH为电解质, 考察了MWCNT的含量对纳米复合薄膜电极在白光、可见光照射下光电性能的影响. 结果表明: 相对纯TiO₂薄膜电极, MWCNT/TiO₂纳米复合薄膜电极的光电压、光电流明显增大, 对可见光区的光电响应能力也明显提高. MWCNT薄膜具有良好的电子导电性、吸光性和镂空的网状结构等性质, 形成了一个理想的基板负载TiO₂纳米颗粒, 而且显著提高了纳米复合薄膜电极光生载流子的分离效率和模拟太阳光的利用效率. 研究发现, 纳米复合薄膜电极中MWCNT的最佳含量是0.04 mg/cm².

Photoelectrochemical Properties of Multi-Walled Carbon Nanotube/TiO2 Nanocomposite Films

A series of Mutil-Walled Carbon Nanotube (MWCNT) nanocomposite film electrodes with different amounts of MWCNT were prepared by a sol-gel method. The microscopy and the structure of the nanocomposite film were characterized via scanning electron microscopy (SEM) and X-ray diffraction (XRD). The photoelectrochemical properties of the nanocomposite film electrodes were investigated under white and visible light illumination using KOH as electrolyte. The results showed that the photovoltage and photocurrent of MWCNT/ TiO₂ nanocomposite film electrodes could be evidently enhanced compared with a pure TiO₂ thin film electrode. The photoelectrochemical response under visible light region was also observed for such nanocomposite film electrodes. The charge transfer rate and the total absorption of simulated solar light were remarkably increased because of the presence of MWCNT thin film, which has a superior electron-conducting property, an absorption property and a tanglesome network, providing an ideal matrix for uniform distribution of TiO₂ nanoparticles. It was found that the appropriate amount of MWCNT in the nanocomposite film electrode was 0.04 mg/cm².