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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CdS、PbS、CdS/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:CdS、PbS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100mW/cm2氙灯光照下,CdS/PbS/TiO2光电极具有最高的光电流密度,为5.86mA/cm2,分别是单一量子点敏化CdS/TiO2、PbS/TiO2光电极的3.35、1.21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。
Three-dimensional TiO2 nanotube arrays were prepared on titanium mesh by anodic oxidation. CdS, PbS and CdS / PbS quantum dots (QDs) sensitized TiO2 nanotube array photoelectrodes were prepared by continuous ion-exchange adsorption and reaction. The morphology and structure were characterized by X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, high resolution transmission electron microscopy and UV-vis diffuse reflectance spectroscopy. The results show that the CdS and PbS quantum dots are successfully deposited on the TiO2 nanotube array. The QDs / TiO2 nanotube array has better visible absorption than the pure TiO2 nanotube array. The results showed that the QDs / TiO2 nanotube array had good visible light response and stability. The CdS / PbS / TiO2 photoelectrode had the highest photocatalytic activity under 100mW / cm2 xenon lamp illumination The photocurrent density was 5.86mA / cm2, which was 3.35 and 1.21 times of the single quantum dot sensitized CdS / TiO2 and PbS / TiO2 photoelectrode respectively. Contrasting the two-dimensional structure of TiO2 nanotube array on the titanium substrate, the shortcoming of three-dimensional nanotube array photocurrent decaying with increasing incident angle is greatly improved, which is important for its practical application in solar cells significance.