The influence ofthermal oxidation on the structure and photocatalytic activities for water splitting of dendritic structure ZnFe2 O4
Hierarchical dendritic structure ZnFe2 O4 was prepared by electrochemical reduction and thermal oxi-dation method and the influence of thermal oxidation on the structure and photocatalytic activities for water splitting was researched in this work.X-ray diffractometry and field-emission scanning electron microscopy were used to characterize the crystal structure,size and morphology.UV-Vis diffuse reflectance spectra were ac-quired by a spectrophotometer.Photocatalytic activities for water splitting were investigated under Xe light irra-diation.The results show that the proper increase of the temperature are liable for the growth of hierarchical dendritic structure oxide.If the sintering temperature goes too high,the dendritic structure cracks and breaks off.When the temperature is 200 ℃,the photocatalytic activity of the sample is 43.5μmol/(h?g).Increasing the temperature to 350 ℃/450 ℃,the photocatalytic activity is 70.5 and 75.5μmol/(h?g),respectively.The sintering atmosphere does not only influence the morphology of the sample,but also change the crystal struc-ture.The crystal structure of the sample sintered in high purity nitrogen atmosphere,is composed of ZnFe2 O4 , ZnO and FeZn8.87.Besides,its photocatalytic activity is obviously worse than that of the sample sintered in air.
hierarchical dendritic structure ZnFe2 O4the temperature of thermal oxidationthe atmosphere of thermal oxidationhydrogen production
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