Preparation Of Ruthenium-Based Catalysis Oxygen Evolution For Acid Electrolysis And Electrochemical Performance

The development of an efficient electrocatalyst to reduce OER overpotential is a key condition for proton exchange membrane（PEM）.Due to the limited resources of precious metals and their high price,we need to regulate the structure and composition of catalysts to develop more efficient catalysts,so as to reduce the use of precious metals Ir and Ru.The main research content of this paper is as follows:（1）Ruthenium and its derivatives have been widely studied as OER electrocatalysts in acidic water electrolysis due to its inherent electronic properties and high oxygen evolution activity.A facile p H-induced size regulation approach for Ru nanocrystals has been developed by introducing NaOH and CH₃COOH in polyol system.The size of Ru particles decreases with the increase of the dosage of NaOH,and increases at certain dosage of CH₃COOH.The formation mechanism of ruthenium nanocrystals was investigated through a series of characterizations and kinetic experiments.The electrocatalytic activities of the electrocatalysts derived from these Ru particles were studied toward OER to investigate the influence of particle size on their electrocatalytic properties.Moreover,the prepared electrocatalysts were applied as anodic materials in PEM electrolysis cell and demonstrated excellent performance.（2）The Ru nucleus was prepared by sequential polyol method,which was regulated by NaOH or AA.Ir adheres to the surface of Ru nucleus to form the Ru@Ir core-shell structure,and the activity of the catalyst was further enhanced through the electronic interaction between Ru and Ir elements.The existence of Ir shell slows down the dissolution rate of Ru nucleus and ensures the stability of catalyst.We explored technological conditions of catalyst preparation.The optimum technological conditions were determined by experimental characterization and analysis.The obtained catalyst was tested with three electrodes.It was found that Ru O₂@Ir O₂/C prepared by adding 40 mg NaOH and 20 mg AA had excellent activity when the current density was 10 m A/cm².After stability test in acidic environment of 0.1 M HCl O₄for 17 h,the potential did not increase significantly.It has excellent activity in PEM electrolytic cell test.We have prepared Ru@Ir/C and Ru O₂@Ir O₂/C catalyst with excellent OER and HER activity.