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CdS/PbS 量子点共敏化三维结构TiO2 纳米管阵列光电极的制备及其光电化学性能表征
作者:袁丽 廖建军 李艳芳 曾敏 林春富 李建保 林仕伟 
单位:热带岛屿资源先进材料教育部重点实验室 海南大学材料与化工学院 海口 570228 
关键词:二氧化钛纳米管阵列 量子点 三维结构 光电化学性能 
分类号:TB383
出版年,卷(期):页码:2015,43(8):1135-1142
DOI:10.14062/j.issn.0454-5648.2015.08.16
摘要:

 通过阳极氧化法在钛丝网基底上制备出三维结构的TiO2 纳米管阵列。采用连续离子层吸附与反应法制备了CdSPbSCdS/PbS 量子点(QDs)敏化TiO2 纳米管阵列光电极。利用X 射线衍射仪、扫描电子显微镜、能谱定量分析、高分辨透射电镜、紫外可见漫反射光谱对其形貌和结构进行了表征。结果表明:CdSPbS 量子点成功沉积在TiO2 纳米管阵列上,QDs/TiO2纳米管阵列具有比纯TiO2 纳米管阵列更好的可见光吸收性能。使用电化学工作站测试光电极材料的光电化学性能,结果表明:QDs/TiO2 纳米管阵列具有良好的可见光响应性和稳定性;在100 mW/cm2 氙灯光照下,CdS/PbS/TiO2 光电极具有最高的光电流密度,为5.86 mA/cm2,分别是单一量子点敏化CdS/TiO2PbS/TiO2 光电极的3.351.21 倍。对比在钛片基底上的二维结构TiO2 纳米管阵列,三维结构纳米管阵列的光电流随入射光角度增大而衰减的缺点得到极大改善,这对其在太阳能电池中的实际应用有重要意义。

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 The 3D TiO2 nanotube arrays were prepared via anodization on titanium mesh. The CdS, PbS and CdS/PbS quantum dots(QDs) sensitized TiO2 nanotube arrays were fabricated by successive ionic layer adsorption and reaction method. The samples werecharacterized by X-ray diffraction technique, scanning electron microscopy, energy-dispersive spectrometry, high-resolutiontransmission electron microscopy, and UV-visible diffuse reflectance spectroscopy, respectively. The results show that CdS and PbSquantum dots are deposited onto TiO2 nanotubes. The QDs/TiO2 nanotube arrays exhibit improvements on visible-light absorptionproperties. The photoelectrochemical performance of the photoelectrodes was investigated by means of an electrochemical workstation. Under visible-light illumination with an intensity of 100 mW/cm2, the photocurrent density obtained by CdS/PbS/TiO2photoelectrode is 5.86 mA/cm2, which is 3.35 and 1.21 times of those by CdS/TiO2 and PbS/TiO2 photoelectrodes, respectively.Compared to TiO2 nanotube arrays on Ti sheet, the photocurrent reduction of TiO2/Ti meshes with increasing illumination angles isimproved for promising applications in solar cells.

基金项目:
国家自然科学基金项目(51202050,51162007);天津大学-海南大学创新基金合作项目;海南省普通高校研究生创新科研课题(S18)。
作者简介:
第一作者:袁 丽(1990—),女,硕士研究生。 通信作者:林仕伟(1977—),男,博士,教授。
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