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本文通过RDE和EIS联合技术、等效电路模型,研究了酸性体系中商业Pt/C催化剂ORR行为.研究发现Pt/C动态界面包括两个彼此独立的过程:1)Pt表面原有Pt O还原至Pt过程,2)ORR促进新Pt O形成过程,为催化材料稳定性及活化性提供了关键依据;并发现动态界面促进多孔电极重构以及与传输匹配过程.在高过电位下,ORR的高反应速率可通过增加催化材料憎水性予以改善.上述研究结果可对ORR的直流电化学研究进行有效补充,并提供建模基础.
In this paper, the ORR behavior of commercial Pt / C catalyst in acidic system was studied by the RDE and EIS combined technology, equivalent circuit model. The Pt / C dynamic interface was found to include two independent processes: 1) PtO reduction on Pt surface To Pt, 2) ORR promotes the formation of new Pt O, which provides a key basis for the stability and activation of the catalytic material. It is also found that the dynamic interface promotes the recombination of porous electrodes and the process of transport matching. At high overpotential, ORR The high reaction rate can be improved by increasing the hydrophobicity of the catalytic material.These results can effectively supplement the DC electrochemical study of ORR and provide a basis for modeling.