Exploration Of Bismuth Vanadate-based Photoanode For Photoelectrochemical Water Splitting

Energy is the core of the environmental problems,green clean efficient and low-cost new energy is also the embodiment of the new round of national competitiveness.Through photoelectric catalysis water can prepare hydrogen cracking,cracking in the process of hydrogen in the water,and the simultaneous half reaction of oxygen is the key limiting the reaction control,so finding the right anode materials for water splitting is the significance of hydrogen production.TiO₂ semiconductor as photoanode in the recent years formed a mature system of catalytic water splitting,but TiO₂ can only use 4%of the sunlight ultraviolet region,BiVO₄ semiconductor photoanode can absorb the visible light region,greatly improve the efficiency of sunlight,receiving much attention.Almost all of the semiconductor materials are facing electron-hole recombination issues,difference of composite,the reaction kinetics.In the traditional sense,many approaches such as has a large number of experiments on the morphology structure control of BiVO₄ itself,and mixed or composite catalyst and exploration on the heterojunction structure,this thesis mainly aiming at these problems of BiVO₄photoanode,cocatalyst load,through studying the photocatalytic performance of the different catalysts and the interface reaction mechanism,to further optimize choice suitable electrode.（1）Preparation for BiVO₄ nanoporous materials,and material structure,photoelectrochemical characterization;（2）Exploration of FeOOH/BiVO₄,Co-Pi/BiVO4 photoelectric catalytic properties,and through the test of alternating current impedance（EIS）,controllable intensity modulation photoelectrochemical test system（CIMPS）interface reaction mechanism discussed.（3）Preparation of a variety of iridium salt catalyst,probing into its electrochemical catalytic properties,and were characterized;（4）Exploration of the Ir-COOH/BiVO₄ with IrOx/BiVO₄ photoelectric catalytic properties,and characterized;（5）Exploration of atomic deposition（ALD）Al₂O₃ impact on the stability of the catalyst promoter.