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用于氢气分离的高温电化学池中Pt/C和Pt-Ru/C电催化剂的一氧化碳耐受性

The CO Tolerance of Pt/C and Pt-Ru/C Electrocatalysts in a High-Temperature Electrochemical Cell Used for Hydrogen Separation.

作者信息

Vermaak Leandri, Neomagus Hein W J P, Bessarabov Dmitri G

机构信息

HySA Infrastructure Centre of Competence, Faculty of Engineering, North-West University, Potchefstroom 2520, South Africa.

Centre of Excellence in Carbon Based Fuels, Faculty of Engineering, School of Chemical and Minerals Engineering, North-West University, Potchefstroom 2520, South Africa.

出版信息

Membranes (Basel). 2021 Aug 31;11(9):670. doi: 10.3390/membranes11090670.

DOI:10.3390/membranes11090670
PMID:34564488
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8471372/
Abstract

This paper describes an experimental evaluation and comparison of Pt/C and Pt-Ru/C electrocatalysts for high-temperature (100-160 °C) electrochemical hydrogen separators, for the purpose of mitigating CO poisoning. The performances of both Pt/C and Pt-Ru/C (Pt:Ru atomic ratio 1:1) were investigated and compared under pure hydrogen and a H/CO gas mixture at various temperatures. The electrochemically active surface area (ECSA), determined from cyclic voltammetry, was used as the basis for a method to evaluate the performances of the two catalysts. Both CO stripping and the underpotential deposition of hydrogen were used to evaluate the electrochemical surface area. When the H/CO gas mixture was used, there was a complex overlap of mechanisms, and therefore CO peak could not be used to evaluate the ECSA. Hence, the hydrogen peaks that resulted after the CO was removed from the Pt surface were used to evaluate the active surface area instead of the CO peaks. Results revealed that Pt-Ru/C was more tolerant to CO, since the overlapping reaction mechanism between H and CO was suppressed when Ru was introduced to the catalyst. SEM images of the catalysts before and after heat treatment indicated that particle agglomeration occurs upon exposure to high temperatures (>100 °C).

摘要

本文描述了用于高温（100 - 160°C）电化学氢分离器的Pt/C和Pt-Ru/C电催化剂的实验评估与比较，目的是减轻CO中毒。研究并比较了Pt/C和Pt-Ru/C（Pt:Ru原子比为1:1）在不同温度下于纯氢和H/CO气体混合物中的性能。通过循环伏安法测定的电化学活性表面积（ECSA）被用作评估这两种催化剂性能的一种方法的基础。CO脱附以及氢的欠电位沉积都被用于评估电化学表面积。当使用H/CO气体混合物时，存在复杂的机理重叠，因此CO峰不能用于评估ECSA。所以，从Pt表面去除CO后产生的氢峰被用于评估活性表面积而非CO峰。结果表明，Pt-Ru/C对CO的耐受性更强，因为当Ru被引入催化剂时，H与CO之间的重叠反应机理受到抑制。催化剂热处理前后的SEM图像表明，暴露于高温（>100°C）时会发生颗粒团聚。

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