Electrocatalytic Pathways on Carbon-Supported Platinum Nanoparticles: Comparison of Particle-Size-Dependent Rates of Methanol, Formic Acid, and Formaldehyde Electrooxidation
Electrocatalytic Pathways on Carbon-Supported Platinum Nanoparticles: Comparison of Particle-Size-Dependent Rates of Methanol, Formic Acid, and Formaldehyde Electrooxidation
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DOI：
10.1021/la0200459
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发表时间：
2002-06
期刊：
影响因子：
3.9
通讯作者：
Sungho V Park;Yong Xie;M. J. Weaver
中科院分区：
文献类型：
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作者：
Sungho V Park;Yong Xie;M. J. Weaver
酸性电解液中甲酸、甲醛和甲醇在不同粒径 (d) 范围内的碳载铂纳米颗粒薄膜上的伏安电氧化速率。检查 2−9 nm 的目的是比较这些相关但不同的电催化过程的纳米颗粒尺寸敏感性。当归一化至相同的微观 Pt 表面积时，较大纳米颗粒（d > 4 nm）上的反应速率与在多晶 Pt 上观察到的反应速率相似。如前所述，Pt 纳米颗粒直径低于 4 nm 时，甲醇电氧化速率会降低。然而，甲酸电氧化表现出相反的行为，当 d < 4 nm 时，速率显着增加，而甲醛电氧化对 Pt 纳米颗粒尺寸几乎不敏感。然而，从伏安和红外光谱数据推论，所有三种反应物化学吸附 CO 形成的程度随着 d 的减小而减小，CO 覆盖率...
The voltammetric electrooxidation rates of formic acid, formaldehyde, and methanol in acidic electrolyte on carbon-supported platinum nanoparticle films with varying particle diameters (d) in the range of ca. 2−9 nm are examined with the objective of comparing the nanoparticle size sensitivity for these related yet distinct electrocatalytic processes. The reaction rates on the larger nanoparticles (d > 4 nm) are similar to those observed on polycrystalline Pt when normalized to the same microscopic Pt surface area. As noted previously, the rates of methanol electrooxidation decrease for Pt nanoparticle diameters below 4 nm. However, formic acid electrooxidation exhibits the opposite behavior, with rates increasing markedly for d < 4 nm, while formaldehyde electrooxidation displays little sensitivity to the Pt nanoparticle size. However, the extent of chemisorbed CO formation from all three reactants, as deduced from voltammetric and infrared spectral data, diminishes with decreasing d, the CO coverages fo...