A Study On Ir-based Catalysts For SPE Electrolyzed Water Anodes

Hydrogen energy is one of the most ideal renewable energy sources,It has a wide range of sources and uses,high efficiency and no pollution.Solid polymer electrolyte?SPE?water electrolysis hydrogen production technology has been extensively studied due to its many advantages such as high efficiency,high purity of gas production,and safety.However,the high cost and poor performance of the catalyst restrict the industrialization of the technology.The overpotential of the anodic oxygen evolution reaction is much higher than that of the hydrogen evolution reaction,and corrosion passivation is highly prone to occur during actual operation.In this paper,the following studies were carried out on the anode catalyst,the modification of the catalyst structure and the reduction of the precious metal loading.1.The effect of calcination temperature on the structure of IrO₂ prepared by colloidal method was studied.The correlation between the morphology and structural properties of IrO₂catalyst and its OER activity and stability was established.The results show that the rutile-type IrO2 nanocatalyst prepared at 500°C has the best electrocatalytic activity and stability.2.The effect of proper amount of templating agent on the activity of IrO₂ catalyst was studied.The results show that the addition of templating agent improves the crystallinity of IrO2 rutile phase,affects the morphology distribution of catalyst particles,and significantly improves the catalytic activity.3.The effect of the optimal loading of the active material,the synthesis time and the ATO conductivity on the activity of the supported catalyst was studied with ATO as the support.The results show that the supported catalyst IrO₂/ATO has the best catalytic performance when the mass ratio is?1:2 wt%?.The ATO carrier can affects the IrO₂ grains size and dispersion uniformity.On the basis of the experiment of the best mass ratio,increasing the reaction time after the formation of hydroxide precipitate can obtain the core-shell structure ATO@IrO₂,and IrO₂ was connected to each other to form a highly conductive network structure.More active sites participate in the reaction,thereby improving the electrocatalytic performance.As the conductivity of the ATO carrier increases,the performance of the catalyst gradually increases.4.The performance of SPE electrolytic cell is affected by many factors.In the temperature range of 20?⁸0?,the electrolysis performance of the electrolytic cell gradually increases with the increase of temperature.When the SPE electrolytic cell is operated for a long time,the catalytic layer will fall off due to the continuous scouring of the catalytic layer by deionized water and gas production,the battery performance will be attenuated to varying degrees.