Surface properties of PdAu and PdNi alloys under dynamic conditions: NAP-XPS study

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL Applied Surface Science Pub Date : 2024-11-13 DOI:10.1016/j.apsusc.2024.161789

A.M. Tarditi , A. Santa-Arango , G.E. Gonzalez , Y. Escalante , L. Cornaglia , C. Ostos

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Abstract

Electroless-deposited PdAu and PdNi alloy samples were analyzed using near-ambient X-ray photoelectron Spectroscopy (NAP-XPS) under H₂, CO, and CO₂-containing streams. Gold enrichment in the near-surface region was evidenced in the PdAu sample under all the analyzed conditions, while palladium increment to the surface was observed in the PdNi alloy. The appearance of a new contribution on the Pd 3d core-level region evidenced the formation of PdHx species on the surface. Competitive CO adsorption and the formation of CH_x species at the surface led to the partial blocking of hydrogen adsorption sites, thereby decreasing the PdH_x formation. Methane production was detected under CO/H₂ and CO₂/H₂ mixtures in both PdAu and PdNi alloy samples. Our findings demonstrate that both competitive adsorption and the formation of CH_x or carbide species on the surface of PdAu and PdNi alloys can negatively influence hydrogen permeation through Pd-based membranes.

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动态条件下 PdAu 和 PdNi 合金的表面特性：NAP-XPS 研究

在含 H2、CO 和 CO2 的气流条件下，使用近环境 X 射线光电子能谱（NAP-XPS）分析了无电解沉积 PdAu 和 PdNi 合金样品。在所有分析条件下，PdAu 样品的近表面区域都出现了金富集现象，而 PdNi 合金的表面则出现了钯增量现象。在 Pd 3d 核级区域出现的新贡献证明了表面 PdHx 物种的形成。竞争性 CO 吸附和表面 CHx 物种的形成导致氢吸附位点的部分阻断，从而减少了 PdHx 的形成。在 PdAu 和 PdNi 合金样品中的 CO/H2 和 CO2/H2 混合物中都检测到了甲烷的产生。我们的研究结果表明，PdAu 和 PdNi 合金表面的竞争吸附和 CHx 或碳化物的形成都会对钯基膜的氢气渗透产生负面影响。

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来源期刊

Applied Surface Science 工程技术-材料科学：膜

CiteScore

12.50

自引率

7.50%

发文量

3393

审稿时长

67 days

期刊介绍： Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.