Hydrothermal Synthesis Of Doped SnO₂ And Effect On The Performance Of Electrolyzed Anode Catalysts

Hydrogen energy has high energy values,stability,cleanliness,and wide variety of sources,and it has attracted people’s considerable interest.Solid Electrolyte（SPE）Electrolysis Water Production hydrogen technology has become a leader in various hydrogen production technologies as a mature hydrogen production technology with high efficiency,no pollution,safety and stability,high density and purity.Ir O ₂（cerium dioxide）is the best choice for anode catalysts with high stability and high catalytic activity.However,the reserves of Ir are much lower than the reserves of platinum（As a cathode material）.Therefore,the research in electrolyzed water technology focuses on reducing the proportion of rhodium in the cata lyst to obtain excellent catalytic performance.Because of its excellent chemical stability and electrochemical performance,SnO₂ is widely used in both hydrogenation of batteries and electrolysis of water.The use of Ir O₂ as a carrier has become an effective means of reducing costs.Hydrogen energy has high energy values,stability,cleanliness,and a wide range of sources,and it has attracted people’s attention.Solid Electrolyte（SPE）Electrolysis Water Hydrogen production technology has become a leader in various hydrogen production technologies as a mature hydrogen production technology with high efficiency,no pollution,safety and stability,high density and purity.Ir O ₂（cerium dioxide）is the best choice for anode catalysts with high stability and high catalytic activity.However,the reserves of Ir are much lower than the reserves of platinum.Therefore,the research in electrolyzed water technology focuses on reducing the proportion of rhodium in the catalyst to obtain excellent catalytic performance.Because of its excellent chemical stability and electrochemical performance,SnO₂ is widely used in both hydrogenation of batteries and electrolysis of water.The use of Ir O₂ as a carrier has become an effective means of reducing costs.This article starts with the carrier preparation process and the carrier doping modification.The mesoporous SnO₂ carrier and different elements（Sb,Fe,Co）doped SnO₂ mesoporous materials were prepared by hydrothermal method,and the electrolytic water anode catalyst was synthesized by Adams method.The effects of the hydrothermal conditions,heat treatment and doping elements on the surface structure of the support were characterized by BET,XRD,TEM,and cyclic voltammetry.The influence of the hydrothermal condition,heat treatment,and doping elements on the surface structure of the support was also analyzed.The following conclusions are drawn:（1）The hydrothermal time has a great influence on the support structure.SnO ₂ is downloaded from the hydrothermal time in 6 to 24 hours.The pore size of the mesopores increases,the specific surface area decreases,and the grain size of the support increases.The hydrothermal time is 48 hours.The pore volume was reduced,and the specific surface area was greatly reduced.C omparing with the electrochemical cycle performance,it was found that the hydrothermal time achieved the best performance results for the carrier and its catalyst in 24 hours;（2）When the amount of Sb incorporated is from 5%to 20%,the distribution of IrO₂ on the support tends to be uniform and the crystallite size increases slightly.b.The incorporation of 30%leads to precipitation of Sb ₂O₃,causing abnormal growth of crystal grains,showing coarse columnar crystals and affecting the performance of th e catalyst.The performance of Sb_0.2Sn_00.8O₂/40Ir O₂ is best obtained by the CV test.（3）Fe-doped SnO₂ experiments show that doping of Fe can effectively improve the proton transfer of SnO₂ crystals.When Fe is doped with SnO₂,the grain size of the support gradually decreases,and the electrochemical cycling performance of the catalyst gradually increases from 5-20%.Increased,much better than pure SnO₂load Ir O₂ up to 1287（Q）/m C·（cm2 mg）-1.（4）Co-doped SnO₂ experimental results show that the heat treatment temperature affects the change of the catalyst performance by affecting the mesoporous structure of the support.Through comparison,it is found that the catalyst performance rises first and then decreases with the heat treatment temperature,and the catalyst performance is maximized at 400°C.,which catalyzes.The active area is1478 m C·（cm² mg）-1.Compared with the catalyst performance at different doping levels,it was found that the catalytic performance of the catalyst decreased with the increase of Co doping amount.The single cell test results show that the Co O-doped SnO₂ has the greatest improvement in the performance of the Ir O₂ single cell,with an oxygen evolution overpotential of 1.88V at a current density of 1.0m A,much lower than the 2.046V overpotential under pure Ir O ₂;Fe doping The overpotential of the catalyst was 2.132 V,and the performance of the single cell decreased.