Photoelectrochemical water splitting on highly smooth and ordered TiO2 nanotube arrays for hydrogen generation
Photoelectrochemical water splitting on highly smooth and ordered TiO2 nanotube arrays for hydrogen generation
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DOI：
10.1016/j.ijhydene.2010.03.032
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发表时间：
2010-08
影响因子：
7.2
通讯作者：
Zhonghai Zhang;Md. Faruk Hossain;Takakazu Takahashi
中科院分区：
文献类型：
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作者：
Zhonghai Zhang;Md. Faruk Hossain;Takakazu Takahashi
为了提高光电化学（PEC）分解水制氢的效率，采用简单有效的两步阳极氧化法制备了高度光滑有序的莲藕状TiO 2纳米管阵列（TiO 2 NTs）.在两步阳极氧化过程中制备的TiO 2纳米管（2-stepTiO 2 NTs）表现出更好的表面光滑度和管的有序性比那些在一步阳极氧化过程中制备的TiO 2 NTs（1-stepTiO 2 NTs）。在100 mW/cm ~ 2（AM 1.5，模拟太阳光）的1 M KOH溶液中，水在二阶TiO_2 NTs电极上的氧化效率（入射光子-电流效率在360 nm处为43.4%，光电流密度在1.23VRHE处为0.90mA/cm ~ 2）高于一阶TiO_2 NTs电极。发现对于1步TiO 2 NTs和2步TiO 2 NTs，有效的光子到氢的转化效率分别为0.18%和0.49%。这些结果表明，TiO 2 NTs的结构的光滑和有序性在改善PEC水裂解制氢应用中起着重要作用。
To improve the photoelectrochemical (PEC) water splitting efficiency for hydrogen production, we reported the fabrication of lotus-root-shaped, highly smooth and ordered TiO2nanotube arrays (TiO2NTs) by a simple and effective two-step anodization method. The TiO2NTs prepared in the two-step anodization process (2-step TiO2NTs) showed better surface smoothness and tube orderliness than those of TiO2NTs prepared in one-step anodization process (1-step TiO2NTs). Under illumination of 100mW/cm2(AM 1.5, simulated solar light) in 1M KOH solution, water was oxidized on the 2-step TiO2NTs electrode with higher efficiency (incident-photon-to-current efficiency of 43.4% at 360nm and photocurrent density of 0.90mA/cm2at 1.23 VRHE) than that on the 1-step TiO2NTs electrode. The effective photon-to-hydrogen conversion efficiency was found to be 0.18% and 0.49% for 1-step TiO2NTs and 2-step TiO2NTs, respectively. These results suggested that the structural smoothness and orderliness of TiO2NTs played an important role in improving the PEC water splitting application for hydrogen generation.