Study Of Catalyst In PEM Water Electrolysis And Directly Coupling Photovoltaic System Simulation

The development of clean and renewable energy has gradually become an important theme of the global energy technological revolution and hydrogen is supposed to be the most optimal energy in the future by many researchers.Among many hydrogen production routes,it is crucial to decarbonize the entire generation process.Hydrogen generation from renewable energy can realize the zero-carbon hydrogen production.With the rapid development of renewable energy power generation,the cost of hydrogen production from water electrolysis is expected to drop significantly.Among water electrolysis technologies,the PEM water electrolysis has received much attention because of its wide current range and fast response speed,which is suitable to match the renewable energy load.The PEM water electrolysis process consists of the following two electrochemistry reactions:cathode:2H⁺+2e^-→H₂anode:H₂O-2e^-→1/2O₂+2H⁺This thesis is devoted to the research on the design and synthesis of oxygen evolution reaction catalysts and simulation of Photovoltaic-PEM water electrolysis system.IrO₂ is the most commercially used anodic catalyst in the PEM water electrolysis system,but iridium is very rare on the earth.This paper attempts to reduce the use of iridium in PEM water electrolysis system by optimizing the preparation process and supporting catalyst.The effects of temperature,time and atmosphere on the properties of IrO₂ by Adams fusion method were studied.The obtained IrO₂ catalyst and commercial 60wt%Pt/C catalyst were sprayed to a N115membrane to prepare the membrane electrode,which was then applied in the PEM water electrolysis device.It shows that under the same conditions,the current of the home-made membrane electrode was about 18.4%higher than the commercial one.Finally,the produced IrO₂catalyst was supported on the ATO.Under the same quality of catalyst loading,the the mass activity of IrO₂/ATO was 2.09 times of IrO₂.The photovoltaic directly coupling PEM water electrolysis system was designed and simulated by SIMULINK.The mathematical models of photovoltaic cell and PEM water electrolyzer were established respectively,and the corresponding working curves were obtained.After the input of simulated solar intensity signal,the solar-to-hydrogen efficiency of the coupling system can achieve over 15%.