Study Of An Anodic Catalyst Support For SPE Water Electrolysis

Hydrogen is called the ideal fuel and energy carrier for the future.Solid Polymer Electrolyte Water Electrolyzer?SPEWE?has the advantages of high efficiency,high product purity,and strong adaptability.It is not only considered as a superior hydrogen production technology than traditional alkaline electrolysis water technology and is also considered to be a potential solution to the problem of excess power capacity,which can effectively alleviate the problem of“discarding wind and abandoning electricity”.However,the Oxygen Evolution Reaction?OER?of the anode is one of the key factors affecting the water electrolysis performance of the SPE.IrO₂ is considered to be the best anode catalyst due to its high electrochemical properties and good stability under strongly acidic and high anodic potential conditions.However,its wide application is limited by the price and amount of iridium.Therefore,there is an urgent need to reduce the amount of iridium used to make SPEWE technology available on a large scale for industrial applications.This paper starts with reducing the loading of catalyst,increasing the oxygen evolution activity and electrochemical stability of the catalyst.By using carrier technology,the preparation of TiO₂ carrier and its application in SPE water electrolysis anode catalyst are studied.The evaporation-induced self-assembly?EISA?method was used to synthesize TiO₂ support.The effects of the temperature of the deplating agent P123 and the mole ratio of the template P123 and the titanium on the surface structure and crystal form of the TiO₂ support were investigated.The load was also prepared using the Adams fusion method.The effects of V,W doping amount and catalyst loading on the surface structure and crystal form of TiO₂ support were investigated.The crystal structure,morphology and surface elemental composition of the catalyst were analyzed by XRD,BET,TEM,XPS and other methods.The oxygen evolution activity and stability of the catalyst were studied by electrochemical method.The experimental results are as follows.?1?As the temperature of the template-removing increases,the specific surface area of the TiO₂ support decreases,and the pore size increases.However,as the molar ratio of P123 and titanium increases,the specific surface area of the supported TiO₂increases and the pore size decreases.When the temperature of the template-removingt is 350°C,the TiO₂ prepared by the molar ratio of P123 and titanium is 0.03,the 40wt%IrO₂ supported catalyst is prepared,and its oxygen evolution activity and stability are superior to the pure IrO₂.The TiO₂ carrier increased the dispersion of IrO₂ particles,formed a continuous conductive layer,increased the number of active sites,and effectively utilized IrO₂ particles.?2?The V-doped supported catalyst experimental results showed that when the V doping concentration was 20 at%,it helped to increase the proton conductivity in the oxygen evolution reaction,accelerate the regeneration of active sites and reduce the oxidation coverage of IrO₂.By using Ti_0.8V_0.2O₂ as carrier to prepare V-doped supported catalysts with different IrO₂ loadings,the results show that when the electrode potential is 1.7V,the current density of the supported catalyst with a loading of 40wt%is far better than the pure oxygen IrO₂,its stability is better than that of pure IrO₂.