用于质子交换膜电解水制氢催化剂的制备及性能OA

To elucidate the structure-activity relationship between catalyst composition,structure,and performance,as well as to clarify the hydrogen evolution reaction mechanism in proton exchange membrane(PEM)water electrolysis,and to provide a theoretical basis for the directional design of industrially applicable catalysts,this study proposes a preparation and performance investigation method for PEM water electrolysis hydrogen evolution catalysts.Under laboratory conditions,catalyst samples with different antimony(Sb)additions qualities(100,150,and 200 mg)were prepared and labeled as X-100,X-150,and X-200.Their microstructure and electrochemical properties were characterized and tested using scanning electron microscopy(SEM)and rotating disk electrode(RDE)techniques.The results indicate that X-100 contains a large number of unsupported free-state particles due to insufficient Sb additions qualities,which deteriorates the reaction kinetics and directly leads to a decreased electrochemical reaction rate during PEM water electrolysis.In X-150,the iridium-chromium mixed oxide solid solution forms a continuous network coating structure on the Sb surface,ensuring smooth mass-transfer channels for the oxygen evolution reaction,effectively suppressing the dissolution and loss of the carrier in acidic environments,maintaining the stability of active sites during long-term hydrogen production,and thereby accelerating the PEM water electrolysis reaction rate and enhancing the hydrogen production activity density.In contrast,X-200 suffers from structural stacking caused by excessive Sb addition,which is prone to damage during electrolysis;The destruction of catalyst structural integrity hinders mass and charge transfer processes,limits the oxygen evolution performance of PEM water electrolysis,and ultimately reduces hydrogen production capacity.