单面Pt沉积TiO_2纳米管阵列复合电极光催化制氢
首发时间:2013-03-29
摘要:采用阳极氧化法制备得到TiO_2纳米管阵列电极(TNTs),通过光化学沉积法获得了沉积Pt纳米粒子的TiO_2纳米管阵列复合电极(Pt/TNTs/Pt)。结合SEM、EDS、UV-vis漫反射吸收光谱以及瞬态光电流测试对样品的形貌、组成及光电性能进行表征,并构建二电极光电化学池对Pt沉积TiO_2体系中电荷传输特点进行了探讨,证明光生电子能有效迁移至Pt纳米粒子上并快速参与析氢反应。根据这一机理设计并制备了单面Pt沉积的TiO_2复合电极(Pt/TNTs)。光催化制氢实验结果表明,Pt/TNTs的光催化制氢活性接近Pt/TNTs/Pt,达到了TNTs的6倍。
关键词: 光催化 Pt沉积 TiO_2纳米管阵列 复合电极 氢气
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Photocatalytic Hydrogen Generation by Single Side Pt-deposited TiO_2 Nanotube Arrays Composite Electrodes
Abstract:Titanium dioxide nanotube arrays (TNTs) were prepared by anodization. Pt nanoparticles were assembled on the surface of TiO_2 nanotube arrays (Pt/TNTs/Pt) by photochemical reduction. Microstructure, element composition and optic-electronic property of the electrodes were analyzed by means of SEM, EDS, UV-vis diffuse reflectance spectra and transient photocurrent response. A two-electrode photoelectrochemical cell was constructed to study the charge transfer property. The results show that photogenerated electrons can transfer to Pt nanoparticles and efficiently prompt hydrogen evolution. According to this mechanism, single side Pt-assembled TiO_2 composite electrode (Pt/TNTs) was designed and fabricated. The photocatalytic hydrogen generation reaction results showed that the photocatalytic activity of Pt/TNTs was close to Pt/TNTs/Pt, and was 6 times higher than that of pure TNTs.
Keywords: Photocatalytic Pt-deposited TiO_2 nanotube arrays Composite electrode Hydrogen
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