| TiO2 clusters are atomic aggregates formed by several or even several tens[TiO2]units through Ti-O bonds,which are a relatively stable aggregation state before Ti,O atoms form crystals.Its physical and chemical properties vary with the n value of[TiO2]n contained.TiO2 clusters have ultra-small size（1-5nm）;have a high specific surface area;the formation of a similar crystal band structure and electronic structure of zero defects;show the quantum size effect and its different from the crystal（including nanocrystalline）Special nature.In this paper,TiO2 clusters with obvious quantum size effect were synthesized by simple and controlled low temperature liquid chemical method.The microstructures were characterized by TEM,XRD,XPS,BET and UV spectroscopic spectroscopy.The factors influencing factors were analyzed.Focusing on its ultra-small size,quantum size effect,the stability of the high surface area brought about by the surface area and super surface activity,as a dye-sensitized solar cell photoelectrode material,through IMPS/IMVS,EIS and other photoelectrochemical technology Studied its electron transport performance and tested the photoelectric conversion performance of the battery.It was found that the particle size of TiO2 clusters was about 2 nm,and the atomic arrangement was ordered to be anatase.Because the Ti atoms of TiO2 clusters are Ti4+and there is no oxygen vacancy defects,the surface area of BET Langmuir is 269.28 m2g-1,and the optical band gap of 3.57 eV is 0.357eV,which shows obvious quantum size effect.TiO2 atomic clusters as photoelectrode materials for dye-sensitized solar cells show better electron transport properties.Electrochemical impedance spectroscopy showed that the battery had a very small forward electron transport resistance Rct1=4.96Ω,while the charge complex effect corresponding to the Rct2 value of 170.2Ω,Rct2/Rct1 up to 34.31,showing high photoelectron transfer efficiency and photogenerated separation efficiency. |
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