Study On Synthesis Of Interconnecting Metal-Organic Frameworks With Semiconductors And Its Photocatalytic Hydrogen Production Performance From Water Splitting

Due to widely used fossil energy at the present,energy exhaustion and environmental pollution,like two impediments,have blocked the road to rapid industrial and economic development.It is the urgency to finding out an efficient and clean energy.As one of the most ideal clean energy—hydrogen,which has undoubtedly become the pursuit of researchers for low or even no consumption to obtain hydrogen.Photocatalytic water decomposition technology for hydrogen evolution emerged as the times require.Although it can convert solar energy to decompose water into hydrogen and oxygen,the high recombination rate of electron-holes in traditional photocatalysis leads to the inefficiency of large-scale hydrogen evolution.It is indeed worthy to challenge and in-depth study for improving the efficiency of photocatalysts.In this paper,Metal-Organic Frameworks are introduced to change the internal structure of photocatalysts for accelerating the electron transport speed of photocatalysts in the reaction process and restraining the recombination of electron-holes.While enhancing the activity of the photocatalysts,the mechanism of internal electron transition and transfer was put forward and studied in depth.We did a lot of work which aimed to provide new ideas and pave the way for improving the performance of photocatalytic hydrogen evolution.The main work was as follows:（1）Ni₂P nanoparticles was used to modify g-C₃N₄ and UiO-66 to realize space electronic orbital docking in order to achieve efficient water decomposition by solar energy.Composite photocatalyst g-C₃N₄/UiO-66/Ni₂P was prepared by a simple two-step solvothermal synthesis method.The ratio of the components was changed in the composite photocatalyst to observe their changes in catalytic activity.The detailed process of the whole reaction was described from a novel perspective of cosmic celestial bodies.At the same time,the role of UiO-66 in adsorbing photosensitizers and providing reaction sites was also analyzed in-depth.（2）The application of the synergistic interface between MOFs and NiP_x in the field of photocatalytic hydrogen evolution.Compared to previous work,we were more focused on the synergistic interface of composite photocatalysts.The MOFs was directly used as the base material.And NiP_x,a good electronic transport semiconductor material,was compounded on the surface of the MOFs.The change of material activity after composite was analyzed,and the promoting effect of synergistic interface was found out.The work provided an effective way to inhibit photogenerated electron hole recombination and accelerate electron transfer rate of photocatalyst.At the meanwhile,it provided a reference for the direct action of MOFs materials in the field of photocatalysis.