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首页> 外文期刊>Electrocatalysis >Formation of Pt Skin Layer on Ordered and Disordered Pt-Co Alloys and Corrosion Resistance in Sulfuric Acid
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Formation of Pt Skin Layer on Ordered and Disordered Pt-Co Alloys and Corrosion Resistance in Sulfuric Acid

机译：在有序和无序的Pt-Co合金上形成PT皮肤层和硫酸中的耐腐蚀性

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摘要

The formation of the Pt-enriched layer (Pt skin layer) formed at the surface of the ordered and disordered Pt-Co alloy specimens by a dealloying treatment and its corrosion resistance under potential cycling in sulfuric acid were examined to clarify the dissolution behavior of the Pt skin layer in polymer electrolyte fuel cell-operating conditions. The ordered and disordered Pt-Co specimens were obtained by heat treatment at 1073 and 1473 K, respectively. Co at the alloy surfaces dramatically dissolved in an early phase of the dealloying treatment in naturally aerated 0.5 M H2SO4 at 298 K, and Pt skin layers were formed. Pt skin layers ca. 2 monolayer in thickness were formed on the Pt-Co alloy specimens by the dealloying treatment in 0.5 M H2SO4. The cyclic voltammetry measurements of the Pt-Co specimens showed the existence of Pt skin layers after the dealloying treatment and the inhibition of the Pt oxide formation on the Pt skin layers. The Pt oxide formation for ordered Pt-Co was more suppressed than that for the disordered Pt-Co. The Pt skin layers on the Pt-Co specimens exhibited a higher corrosion resistance than pure Pt, and the dissolution of the Pt skin layer for ordered Pt-Co was more inhibited than that for disordered Pt-Co under potential cycling in the potential range of 0.6-1.4 V in 0.5 M H2SO4 (dissolution test). A thin, continuous Pt skin layer remained at the surface of the ordered Pt-Co specimen after the dissolution test. The formation of a uniform Pt skin layer seems to provide high oxidation resistance to the surface, leading to high corrosion resistance.
机译：通过Dealloying处理在有序和无序的Pt-Co合金标本的表面上形成的PT富集的层（PT皮肤层）及其在硫酸中循环循环的耐腐蚀性下形成，以阐明溶解行为PT皮肤层在聚合物电解质燃料电池操作条件下。通过1073和1473k的热处理获得有序和无序的PT-CO标本。在298K下，在天然气的0.5M H 2 SO 4的蓄电池处理的早期溶解的合金表面上显着溶解，形成Pt皮肤层。 PT皮肤层CA。在0.5M H 2 SO 4中的Deploying处理在Pt-Co合金标本上形成厚度的2单层。 PT-CO标本的循环伏安法测量结果显示了在解放处理后Pt皮肤层的存在，并抑制Pt皮肤层上的Pt氧化物形成。对于无序的PT-CO，对有序PT-CO的PT氧化物形成更抑制。 PT-CO标本上的PT皮肤层表现出比纯PT更高的耐腐蚀性，并且对于有序PT-CO的PT皮肤层的溶解比在潜在范围内的潜在循环下的无序PT-CO溶解0.6-1.4V在0.5M H 2 SO 4中（溶解试验）。在溶解试验后，薄，连续的Pt皮肤层仍然在有序Pt-Co样本的表面。均匀PT皮肤层的形成似乎为表面提供了高抗氧化性，导致耐腐蚀性高。

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