PtRu合金薄膜结构及其催化性能

采用离子束溅射技术(IBS)在碳纤维布基底上制备PtRu/C合金薄膜作为燃料电池电极催化材料. 应用XPS、XRD、GIXD、AFM等分析手段研究了PtRu薄膜表面的成分、化学状态、表面形貌以及PtRu薄膜的表层、次表层和体相的结构. 结果表明, 在双束离子沉积过程中, 由于溅射产生的Pt+和Ru+之间的相互作用, 使薄膜表面的化学状态和薄膜表层(15-40 nm范围内)结构发生了变化, 并影响PtRu薄膜的催化性能. 当xPt/xRu=0.64时, PtRu薄膜出现Ru固溶体在表层富集, 并在表层诱发形成Pt39Ru61非晶相.

Structure and Catalytic Properties of PtRu Alloy Thin-film

A PtRu alloy thin-film used for catalytic electrodes of fuel cells was fabricated by ion beam sputtering(IBS).The structure,surface layer structure,chemical composition,surface chemical state,and morphology of the PtRu alloy thin-film were characterized using X-ray diffraction(XRD),grazing incidence X-ray diffraction(GIXD),X-ray photoelectron spectroscopy(XPS),and atomic force microscopy(AFM).It was shown that the surface chemical state and structure in the top layer(from 15-40 nm)of PtRu alloy thin-film were changed due to the strong interaction between Pt and Ru during the ion beam sputtering deposition process,which also affected the catalytic activity of the PtRu alloy thin-film.In particular,when the atomic ratio of xPt/xRu was 0.64,enrichment of the Ru solid solution and amorphous phase Pt39Ru61 were observed on the surface layer of PtRu alloy thin-film.