Using a pressurized GDE setup to analyze effects of temperature and relative humidity on CO-stripping measurements on a commercial Pt/C ORR catalyst

IF 4.7 3区工程技术 Q2 ELECTROCHEMISTRY

Electrochemistry Communications Pub Date : 2023-10-01 DOI:10.1016/j.elecom.2023.107565

Sven Nösberger, Gustav K. H. Wiberg, Matthias Arenz

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Abstract

This study successfully showcases the capabilities of a newly developed pressurized gas diffusion electrode (GDE) setup by conducting cyclic voltammetry and CO stripping measurements at temperatures up to 120 °C, while considering various relative humidity (RH) levels. Our results clearly demonstrate the feasibility of investigating the effects of RH and elevated temperatures above 100 °C using the pressurized GDE setup. In particular, a negative shift in the CO oxidation peak potential upon increasing temperatures is observed, whereas a reduction in RH leads to a positive potential shift of the CO oxidation peak as well as peak broadening. Additionally, our results highlight the heightened sensitivity of the H_upd peak to changes in temperature and RH, resulting in an underestimation of the electrochemically active surface area (ECSA). An essential aspect of this research is the successful replication of trends observed in membrane electrode assembly (MEA) measurements, providing strong validation for the reliability and effectiveness of our pressurized GDE approach as a valuable bridging tool toward MEA testing at elevated temperatures.

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使用加压GDE装置分析温度和相对湿度对商用Pt/C ORR催化剂co剥离测量的影响

这项研究成功地展示了新开发的加压气体扩散电极(GDE)装置的能力，该装置通过在高达120°C的温度下进行循环伏安法和CO剥离测量，同时考虑到各种相对湿度(RH)水平。我们的研究结果清楚地表明，使用加压GDE装置研究RH和100°C以上高温的影响是可行的。特别是，观察到温度升高时CO氧化峰电位的负移，而RH的降低导致CO氧化峰电位的正移以及峰展宽。此外，我们的研究结果强调了Hupd峰对温度和相对湿度变化的高度敏感性，导致对电化学活性表面积(ECSA)的低估。本研究的一个重要方面是成功地复制了膜电极组装(MEA)测量中观察到的趋势，为我们的加压GDE方法的可靠性和有效性提供了强有力的验证，该方法是在高温下进行MEA测试的有价值的桥接工具。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Electrochemistry Communications 工程技术-电化学

CiteScore

8.50

自引率

3.70%

发文量

160

审稿时长

1.2 months

期刊介绍： Electrochemistry Communications is an open access journal providing fast dissemination of short communications, full communications and mini reviews covering the whole field of electrochemistry which merit urgent publication. Short communications are limited to a maximum of 20,000 characters (including spaces) while full communications and mini reviews are limited to 25,000 characters (including spaces). Supplementary information is permitted for full communications and mini reviews but not for short communications. We aim to be the fastest journal in electrochemistry for these types of papers.