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首页> 外文期刊>Electrocatalysis >Comparative Study of the Electrocatalytically Active Surface Areas (ECSAs) of Pt Alloy Nanoparticles Evaluated by H_(upd) and CO-stripping voltammetry
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Comparative Study of the Electrocatalytically Active Surface Areas (ECSAs) of Pt Alloy Nanoparticles Evaluated by H_(upd) and CO-stripping voltammetry

机译：H_（upd）和CO溶出伏安法评估Pt合金纳米粒子电催化活性表面积（ECSA）的比较研究

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摘要

This study intends to provide some insight in the up-to-date elusive assessment of a correct choice of method for estimating the active surface area of Pt alloy nanoparticle catalysts. Taking PtNi3 nanoparticles as an example, we have compared three types of electrochemically active surface area (ECSA) data, CO-ECSA, H_(upd)-ECSA, and H_(upd)/CO-ECSA, which were evaluated from CO stripping and underpotentially deposited hydrogen stripping steps applied at different times along a reference catalyst activity test protocol. Considering a total of six different detailed voltammetric test protocols, we address Pt alloy particle size effects, analyze the effect of the time of application of CO and hydrogen stripping, and study their effect on the Pt mass and Pt surface-specific activities for the oxygen reduction reaction (ORR). In a discussion of the ratio of CO charge to hydrogen charge, it is shown that this quantity is more complex than previously thought and not associated with a specific surface structure. The H_(upd)/CO-ECSA data are found to be a reasonable balance for the estimate of surface area normalized, so-called specific catalytic ORR activities.
机译：这项研究旨在为正确选择Pt合金纳米颗粒催化剂的活性表面积的方法的正确选择提供最新的难以捉摸的评估。以PtNi3纳米粒子为例，我们比较了三种类型的电化学活性表面积（ECSA）数据，即CO-ECSA，H_（upd）-ECSA和H_（upd）/ CO-ECSA，它们是通过一氧化碳汽提和沿参考催化剂活性测试规程在不同时间进行的欠电位沉积氢汽提步骤。考虑总共六种不同的详细伏安测试规程，我们研究了Pt合金粒径的影响，分析了施加CO和氢汽提时间的影响，并研究了它们对氧气的Pt质量和Pt表面比活度的影响还原反应（ORR）。在讨论CO电荷与氢电荷的比率时，表明该数量比以前认为的更为复杂，并且与特定的表面结构无关。发现H_（upd）/ CO-ECSA数据是合理的平衡，可用于估算标准化的表面积，即所谓的特定催化ORR活性。

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