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首页> 外文期刊>Electrocatalysis >Evaluation of Oxygen Reduction Activity by the Thin-Film Rotating Disk Electrode Methodology: the Effects of Potentiodynamic Parameters
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Evaluation of Oxygen Reduction Activity by the Thin-Film Rotating Disk Electrode Methodology: the Effects of Potentiodynamic Parameters

机译：薄膜转盘电极法评价氧还原活性：电位参数的影响

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摘要

An accurate and efficient assessment of activity is critical for the research and development of electrocatalysts for oxygen reduction reaction (ORR). Currently, the methodology combining the thin-film rotating disk electrode (TF-RDE) and potentiodynamic polarization is the most commonly used to pre-evaluate ORR activity, acquire kinetic data (i.e., kinetic current, Tafel slope, etc.), and gain understanding of the ORR mechanism. However, it is often neglected that appropriate potentiodynamic parameters have to be chosen to obtain reliable results. We first evaluate the potentiodynamic and potentiostatic polarization measurements with TF-RDE to examine the ORR activity of Pt nanoelectrocatalyst. Furthermore, our results demonstrate that besides depending on the nature of electrocatalyst, the apparent ORR kinetics also strongly depends on the associated potentiodynamic parameters, such as scan rate and scan region, which have a great effect on the coverage of adsorbed OHad/O-ad on Pt surface, thereby affecting the ORR activities of both nanosized and bulk Pt. However, the apparent Tafel slopes remained nearly the same, indicating that the ORR mechanism in all the measurements was not affected by different potentiodynamic parameters.
机译：活性的准确和有效评估对于氧还原反应（ORR）的电催化剂的研究和开发至关重要。当前，将薄膜旋转盘电极（TF-RDE）和电位动力学极化相结合的方法是最常用的预评估ORR活性，获取动力学数据（即动力学电流，Tafel斜率等）并获得增益的方法。了解ORR机制。但是，通常被忽略的是必须选择适当的电位动力学参数以获得可靠的结果。我们首先评估用TF-RDE进行的电位动力学和恒电位极化测量，以检查Pt纳米电催化剂的ORR活性。此外，我们的结果表明，除了取决于电催化剂的性质以外，表观ORR动力学还强烈取决于相关的电位动力学参数，例如扫描速率和扫描区域，这对吸附的OHad / O-ad的覆盖率有很大影响在铂表面上，从而影响纳米级和本体铂的ORR活性。然而，表观塔菲尔斜率保持几乎相同，表明在所有测量中的ORR机制不受不同的电位动力学参数的影响。

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