Enhanced solar water-splitting efficiency using core/sheath heterostructure CdS/TiO2 nanotube arrays
Enhanced solar water-splitting efficiency using core/sheath heterostructure CdS/TiO2 nanotube arrays
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DOI：
10.1088/0957-4484/18/49/495608
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发表时间：
2007-12
期刊：
影响因子：
3.5
通讯作者：
Y. Yin;Zhengguo Jin;F. Hou
中科院分区：
文献类型：
--
作者：
Y. Yin;Zhengguo Jin;F. Hou
提出了一种新的制备芯/鞘型异质结构CdS/TiO 2纳米管阵列的方法，并将其应用于光电化学电池中。采用场发射扫描电子显微镜（FESEM）对CdS/TiO 2电极的形貌进行了表征。通过X射线衍射（XRD）发现沉积的材料为六方CdS结构。合成的CdS/TiO 2电极在可见光区表现出比纯TiO 2纳米管阵列高得多的光电流密度。我们表明，交流沉积电压和时间可以控制CdS/TiO 2复合结构，这是决定水裂解反应的整体效率的关键。最大的光电流密度获得与芯/鞘异质结CdS/TiO 2纳米管阵列，这是通过沉积的CdS在5 V的30分钟，2.5 μm的管长度。
A novel fabrication route for core/sheath heterostructure CdS/TiO2 nanotube arrays is proposed using ac electrodeposition for application in photoelectrochemical cells. The morphologies of the CdS/TiO2 electrodes, which were prepared by electrochemically depositing CdS directly into anodic titanium nanotubes from an electrolyte containing Cd2+ and S in dimethyl sulfoxide, were characterized by a field emission scanning electron microscope (FESEM). The deposited material was found to be in a hexagonal CdS structure by x-ray diffraction (XRD). The synthesized CdS/TiO2 electrodes showed much higher photocurrent density in the visible wavelength region than pure TiO2 nanotube arrays. We demonstrate that ac deposition voltage and time can control the CdS/TiO2 composite architecture, which is crucial in determining the overall efficiency of the water-splitting reaction. The maximum photocurrent density was obtained with the core/sheath heterostructure CdS/TiO2 nanotube arrays, which were fabricated by deposition of CdS at 5 V for 30 min with 2.5 µm tube length.