Fabrication And Photoelectrical Property Of Micro-nanostructure Oxide Photoanode Materials

As we known, the nanostructural materials have some special performances in term of light, heat, electricity, and magnetic and it makes the nanostructure materials have a broad prospect of application, more and more researchers force on this field, such as through improving the synthetic process of nanomaterials to get the corresponding properties. The main research contents of this paper are shown as follow:1. The TiO2nanotube is prepared by anodic oxidation, meanwhile sensitised by CdS quantum dot and study their photoelectrochemical properties.Firstly, we use the pure Ti sheet as the anode, the platinum electrode as the cathode, and0.5wt%NH4F glycerol solution as the electrolyte, the voltage in this process was40V. After getting the TiO2, it will be annealed under450℃for1h, and cooled in furnace. The SEM, TEM, EDS and XRD are used to analyze TiO2nanotubes, we can get that the nanotube array of specimens accord with the expected array, the diameter is about125nm. Secondly, the continuous ion deposition method is used to precipitate the CdS quantum dot which the ion source is Cd2+, S2-from Cd(NO3)2and Na2S, respectively. After testing, we find that the CdS quantum dots adsorb on the TiO2nanotubes which are diffuse shape. In addition, with the increase of the CBD times, the number of CdS quantum dots adsorb on TiO2nanotubes also increases accordingly. we apply them on the solar battery, that will improve the absorption of light, and then increase the photoelectric conversion efficiency.2. Urchin-like Zn/ZnO micro-nano structures synthesized by evaporation method and study their photoelectric chemical properties.First of all, metal Zn ball was prepared by evaporation method. The precursor Zn particles is put in median area of the tube furnace to be heated and then make the cleaned FTO below the protective gas flow, the distance is8cm from precursor Zn particles, temperature is400～450℃, we should note that the vacuum degree is0.01Torr during whole process. After that, we put the temperature to800℃and hold for30mins. Through using the SEM, TEM, EDS, XRD, we find the Zn particle samples conform to the desired effect. Secondly, Zn spherical particles are subjected to a heat treatment in an air atmosphere under520℃for5h. We observe that Zn ball surface is covered with one-dimensional ZnO nanowires, and form similar to urchin micro-nano structures. Finally, the prepared urchin-like Zn/ZnO micro-nano structures are used on anode of DSSCs and their photoelectrochemical properties are also tested.3. Preparation of urchin-like Zn/ZnO/ZnS micro-nano structures and their photoelectrochemical properties.We make the micron size Zn particles as the precursor precipitate on the FTO in the tube furnace, and then do the heat treatment to get the urchin-like Zn/ZnO micro-nano-structures. Afterwards, the prepared FTO is put in the0.2M thioacetamide aqueous solution, holding temperature is90℃. Study the growth mechanism and performance and the photoelectrochemical properties of DSSCs are tested.