Novel carbon-doped TiO2 nanotube arrays with high aspect ratios for efficient solar water splitting
Novel carbon-doped TiO2 nanotube arrays with high aspect ratios for efficient solar water splitting
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DOI：
10.1021/nl051807y
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发表时间：
2006-01-01
期刊：
影响因子：
10.8
通讯作者：
Bard, AJ
中科院分区：
文献类型：
--
作者：
Park, JH;Kim, S;Bard, AJ
利用太阳光将水光催化分解成氢和氧是一种潜在的清洁和可再生的氢燃料来源。（1，2）人们对TiO 2、WO 3和Fe 2 O3等金属氧化物半导体进行了广泛的研究，这些半导体可用作薄膜形式的光阳极。(3-5)在开发的光阳极材料中，TiO 2仍然是最有前途的材料之一，因为其成本低，化学惰性和光稳定性。(6)然而，TiO 2的广泛技术应用受到其在可见光区域中对太阳能的低利用率的阻碍。在这项研究中，我们报告的制备垂直生长的碳掺杂的TiO 2（TiO 2-C-x（x））纳米管阵列具有高的纵横比，最大限度地提高白光照射下的水的光裂解。合成的TiO 2-xCx纳米管阵列在可见光照射下（> 420 nm）表现出比纯TiO 2纳米管阵列更高的光电流密度和更有效的水分解。在白光照射下，总光电流比P-25纳米颗粒膜高20倍以上。
The photocatalytic splitting of water into hydrogen and oxygen using solar light is a potentially clean and renewable source for hydrogen fuel.(1,2) There has been extensive investigation into metal-oxide semiconductors such as TiO2, WO3, and Fe2O3, which can be used as photoanodes in thin-film form.(3-5) Of the materials being developed for photoanodes, TiO2 remains one of the most promising because of its low cost, chemical inertness, and photostability.(6) However, the widespread technological use of TiO2 is hindered by its low utilization of solar energy in the visible region. In this study, we report the preparation of vertically grown carbon-doped TiO2 (TiO2-C-x(x)) nanotube arrays with high aspect ratios for maximizing the photocleavage of water under white-light irradiation. The synthesized TiO2-xCx nanotube arrays showed much higher photocurrent densities and more efficient water splitting under visible-light illumination (> 420 nm) than pure TiO2 nanotube arrays. The total photocurrent was more than 20 times higher than that with a P-25 nanoparticulate film under white-light illumination.