Preparation Of Iron-based Cocatalysts And Their Photocatalytic Hydrogen Evolution Via Dye Sensitization

The lack of resources and environmental pollution make our lives face enormous challenges,the study on clean and efficient pollution-free energy is imminent.Hydrogen fuel is considered to be an ideal energy carrier due to its high heat value,no pollution and reproducibility.Solar energy is inexhaustible,and the produce hydrogen via utilizating sunlight attracts much attention.Dye sensitization is an effective means to improve the visible light utilization of solar energy.In order to achieve efficient dye-sensitized hydrogen production,a cocatalyst for hydrogen evolution is required.Elemental iron itself as the cocatalyst shows very low activity for hydrogen production in the dye-sensitized system.It is possible to improve the hydrogen production activity of the iron-based composite co-catalyst in the dye-sensitized system by improving the interaction between the cocatalyst and the dye and enhancing the hydrogen evolution activity of the composite co-catalyst.In this dissertation,?-FeOOH and Fe₂O₃@FeB_x were reduced by photo-reduction method,and two the iron-based composite co-catalysts were prepared.The photocatalytic hydrogen production performance of Eosin Y sensitization was studied.The dissertation consists of the following two parts:?1?.Fe/?-FeOOH-x iron-based composite co-catalyst was prepared by photo-reduction using?-FeOOH as precursor.The effects of Fe/?-FeOOH-x on the activity of decomposition of water to produce hydrogen under visible light irreadiation was investigated using trimethylamin as the electron donor and Eosin Y as sensitizer.It was found that the hydrogen production activity was the best when the photo-reduction time was 12 h,and the hydrogen production amount of Fe/?-FeOOH was 5.4 times of that of Fe,Adsorbed amount of the dye on Fe/?-FeOOH is much larger than on metal iorn,improving the photocatalytic hydrogen production activity.?2?.Fe@FeB_x with novel core-shell structure was prepared by photoreduction using Fe₂O₃@FeB_x as the precursor.The activity of novel core-shell Fe@FeB_x for hydrogen production from water decomposition was investigated by using Eosin Y as sensitizer and trimethylamine as electron donor under visible light???420 nm?.It was found that the novel nanometer core-shell Fe@FeB_x photocatalyst has good photocatalytic activity and stability.The hydrogen production of Fe@FeB_x is 9.2 times of that of Fe.The composite of Fe and FeB_x reduces the hydrogen evolution potential,which improves the hydrogen production activity.