Nuclear Magnetic Resonance Characterization Of Nano-Energy Materials Prepared By Hydrothermal Method And Electrocatalytic Study

In recent years,new energy source with low pollution is urgently needed to gradually improve the current energy structure for the problem of environmental pollution and energy exhaustion.Fuel cells and dye-sensitized solar cells have received more extensive attention under this background.Fuel cells have the advantages of high power density and energy conversion efficience,low pollution,etc.Meanwhile,dye-sensitized solar cells can directly convert solar energy into electric energy and the energy source is economic and sustainable.Both of the two kinds of cells are quite promising for industrial application.However,the performance of fuel cell catalysts still needs to be improved.Moreover,catalysts are expensive and easily deactivated by the intermediate generated in the electrochemical reaction.The comprehensive properties of new dye-sensitized solar cell materials also need to be promoted,and new sensitized materials with high energy conversion eficiency need to be developed.The purpose of this paper is to prepare new kinds of battery materials with excellent performance and high catalytic efficiency so as to improve the energy conversion efficiency.Three battery materials were prepared by hydrothermal method and electrodeposition method.The main work is as follows:(1)Pt/MoS2 catalysts were prepared by hydrothermal method and followed by a electrodeposition process,and the electrochemical process of ethanol oxidation was monitored by in-situ electrochemical-nuclear magnetic resonance(EC-NMR)technology to explore the reaction process.The reaction energy barrier of MoS2-supported Pt atom,C-supported Pt atom,and pPure Pt atom were investigated by using the density functional theory calculations.The Pt/MoS2 prepared by this method has high dispersion.Due to the high surface area and abundant edge defects of MoS2,Pt/MoS2 exhibits excellent catalytic performance.Experimental results and theoretical calculations show that the catalytic efficiency of Pt/MoS2 is high.(2)Hydrothermal method was used to synthesize MoS2/GNS supporting materials,and then Pt was deposited on MoS2/GNS by electrodeposition method to prepare Pt/MoS2/GNS complex catalyst.The catalyst was characterized by various methods and the process of electrocatalytic oxidation of ethanol was investigated by in situ electrochemical-nuclear magnetic resonance technology.The average particle size of Pt/MoS2/GNS is further reduced,which is uniformly dispersed.It was found that the catalytic activity of Pt/MoS2/GNS complex nano-catalyst was further improved due to the large specific surface area of MoS2 and the high conductivity of GNS.(3)Y0.80Yb0.18Er0.02OF nanorod was prepared by hydrothermal calcine method,and it could serve as an additive to the photoanode material of dye-sensitized solar cells to explore the photoelectric conversion performance.The experiments show that the up-conversion luminescence characteristics of YYEOF nanorod can improve the utilization rate of solar energy,and YYEOF nanorod,as a p-type dopant,can also increase the photovoltage of the solar cells.Therefore,this type of dye-sensitized solar cell has a good development prospect.