Laboratoire de Catalyse en Chimie Organique, Equipe Electrocatalyse, Université de Poitiers, 40 Avenue du Recteur Pineau, 86022 Poitiers Cedex, France.
Langmuir. 2012 Feb 21;28(7):3658-63. doi: 10.1021/la202913b. Epub 2011 Nov 7.
An understanding of the oxidation of chemisorbed CO (CO(chem)) on Pt nanoparticle surfaces is of major importance to fuel cell technology. Here, we report on the relation between Pt nanoparticle surface structure and CO(chem) oxidative stripping behavior. Oxidative stripping voltammograms are obtained for CO(chem) preadsorbed on cubic, octahedral, and cuboctahedral Pt nanoparticles that possess preferentially oriented and atomically flat domains. They are compared to those obtained for etched and thermally treated Pt(poly) electrodes that possess atomically flat, ordered surface domains separated by grain boundaries as well as those obtained for spherical Pt nanoparticles. A detailed analysis of the results reveals for the first time the presence of up to four voltammetric features in CO(chem) oxidative stripping transients, a prepeak and three peaks, that are assigned to the presence of surface domains that are either preferentially oriented or disordered. The interpretation reported in this article allows one to explain all features within the voltammograms for CO(chem) oxidative stripping unambiguously.
了解化学吸附 CO（CO(chem)）在 Pt 纳米粒子表面上的氧化对于燃料电池技术非常重要。在这里，我们报告了 Pt 纳米粒子表面结构与 CO(chem)氧化剥离行为之间的关系。对于具有优先取向和原子平坦域的立方、八面体和立方体八面体 Pt 纳米粒子上预吸附的 CO(chem)，我们获得了氧化剥离伏安曲线。将它们与具有原子平坦、有序表面域的刻蚀和热处理 Pt(poly)电极以及具有球形 Pt 纳米粒子的氧化剥离伏安曲线进行了比较。对结果的详细分析首次揭示了 CO(chem)氧化剥离瞬变中存在多达四个伏安特征，一个前峰和三个峰，这些特征归因于表面域的存在，这些表面域要么是优先取向的，要么是无序的。本文报道的解释使得能够明确地解释 CO(chem)氧化剥离伏安图中的所有特征。
