Titania Nanotube Arrays Preparation And Solar Light Photoelectrochemical Performance Study

Titanium dioxide as a new kind of inorganic material has non-toxic, stable chemicalperformance, high oxidation and good photoelectrochemical properties, which has beenwidely applied in environment protection, sensitization solar battery and water splitting, etc.This thesis mainly studied TiO2nanotube arrays, which was prepared by anodicoxidation with the modification of iron and nitrogen element, silver elements, cadmiumsulfide, and its photoelectrochemical properties. TiO2nanotubes were preparated throughanodic oxidation method by changing the anodevoltage, electrolyte concentration andoxidation time to achieve series of samples.By X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM)test techniques, the different preparation conditions on the influence of morphology andcrystal structures were studied. In order to study the preparation of titanium dioxide nanotubearrays photoelectrochemical properties, electrochemical workstation was used to obtain thebest anodic oxidation preparation conditions by photoelectric chemical results.In order to expand utilization of solar light, the titanium dioxide nanotube arrays weremodified to research these properties. Prepared by anodic oxidation method and wet chemicalmethod of Fe-N co-doped TiO2nanotube arrays, at0.10M/L Fe3+condition has the bestphotoelectrochemical properties, in which the photocurrent can reach to0.43mA/cm2, NDto2.91×1020cm-3, photoconversion efficiency to1.6%. Prepared by anodic oxidation method andphotodeposition method of precious metal Ag doped TiO2nanotube arrays, afterphotodeposition Ag15min, the photocurrent can reach to0.28mA/cm2, NDto2.21×1022cm-3,photoconversion efficiency to4.10%. Prepared by anodic oxidation method and impregnationmethod of CdS composite TiO2nanotube arrays, after1cycle composite CdS has bestphotoelectrochemical properties under the condition of composite CdSmodification, which the photocurrent can reach to0.58mA/cm2, NDto5.08×1022cm-3, photoconversion efficiencyto4.02%.This paper innovation points:(1) By Fe-N co-doped, TiO2nanotubes can be reduced the forbidden band width andjoined the middle gap, improving the photoelectrochemical performance under solar light.(2) Preparation of photodeposition Ag on TiO2nanotube arrays and narrow-bandsemiconductor CdS on TiO2nanotube arrays, which lowered light compound probability ofelectrons and holes, showed excellent photoelectrochemical properties.