Preparation Of Core-shell Hierarchical Structure Composites And Study On Photocatalytic Hydrogen Evolution Performance

The development of green low carbon,clean and efficient hydrogen energy is an effective strategy to solve the problem of energy crisis and environmental pollution,and it is the focus of human research.The efficient photocatalytic decomposition of water for hydrogen production requires the effective separation and transfer of electron holes in the catalyst.The morphology of nanomaterials has great influence on their properties.Compounds with special morphologies can expose more active sites to enable the efficient separation and utilization of electrons.The hierarchical core-shell structure satisfies this condition.Large specific surface area can provide more active sites.At the same time,cocatalyst was be loaded on the hierarchical structure can improve the transfer of electrons and efficient use.The main contents are as follows:?1?Using Carbon fiber as a substrate,tetrabutyl titanate as the titanium source,in the presence of ethanol as solvothermal reaction,TiO₂ nanowires were grown in situ on carbon fiber composites.Finally hierarchical TiO₂/CNFs composites formed after calcination.Then the NiS nanoparticles were loaded on the TiO₂/CNFs composites by impregnation method.The photocatalytic hydrogen evolution properties of composite materials under simulated solar irradiation were tested by experiments.The effects of different content ratio and different amount of cocatalyst on hydrogen production were studied.?2?The core-shell structure of In₂S₃/CNFs was synthesized by solvothermal method using carbon fiber as substrate.The reaction mechanism of In₂S₃ can be inferred by adjusting different reaction time.Then the MoS₂ nanoparticles were loaded on the surface of In₂S₃/CNFs by hydrothermal method and adjusting the loading amount of different proportion of cocatalyst.The best sample was determined by photocatalytic decomposition of water hydrogen evolution,and the hydrogen evolution performance of different catalysts was studied.?3?Using copper mesh as a substrate,in situ growth of ZnIn₂S₄ nanocrystals on copper mesh surface was prepared by adding sulfur,indium,zinc and ethanol as solvothermal solution,Then the Ni?OH?₂ cocatalyst was loaded on the surface of the synthesized sample by impregnation method.Adjusting the amount of nickel source and NaOH to obtain the loading amount of cocatalyst of different proportion.The performance of photocatalytic decomposition of water for hydrogen evolution was tested,and the hydrogen evolution performance of different amount of co-catalyst and different mass of catalyst was also studied.