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Enhanced photocatalytic water-splitting performance using Fe-doped hierarchical TiO2 ball-flowers
Fangfang Wang1, Tong Shen2, Zhengping Fu2
1National Key Laboratory of Science and Technology on Micro/Nano Fabrication, Key Laboratory for Thin Film and Microfabrication of the Ministry of Education, Department of Micro/Nano Electronics, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China.
Abstract:
The photocatalytic water-splitting behavior of hierarchically structured TiO2 ball-flowers with different Fe ion contents was studied, in order to elucidate the effects of Fe doping on their water-splitting performance. It was found that with the increase of Fe doping content, the hydrogen evolution rate increased initially and then decreased. The highest hydrogen evolution of 697 μmol g-1 is observed for 2Fe/TiO2, after 4 h of light irradiation, which was five times greater than that in the case of pure TiO2 who has 140 μmol g-1 hydrogen evolution after 4 h of light irradiation. This improvement in the water-splitting efficiency owing to optimized Fe doping could be attributed to an enhancement in the visible-light absorption characteristics and an increase in the number of oxygen vacancies, which act as the reaction sites for water splitting.
