Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 268, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2020.118734
Keywords
Electrocatalysis; Hydrogen; Electrochemical purification; Hydrogen pump; Carbon monoxide
Funding
- Fuel Cells and Hydrogen 2 Joint Undertaking [735533]
- European Union
- Hydrogen Europe and Hydrogen Europe Research
- U.K. Engineering and Physical Sciences Research Council [EP/J016454/1]
- EPSRC [EP/I037024/1, EP/J021199/1, EP/G06704X/1] Funding Source: UKRI
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Current ex-situ electrochemical characterisation techniques for measuring the hydrogen reaction are insufficient to effectively characterise catalytic behaviour under CO containing environments. We show the high mass transport, floating electrode technique offers a solution as it adequately describes hydrogen oxidation (HOR) and evolution over a wide potential range, as needed for various electrochemical systems. The peak HOR mass activities measured on the floating electrode were 68-93 A.mg(metal)(-l)- significantly higher than achieved in an experimental setup of an electrochemical hydrogen pump (EHP, 6-12 A.mg(metal)(-1)). This implies that the EHPs operate with a significant mass transport limitation. Additionally, poison tolerances of catalysts using low concentrations of 20 ppm CO produced transient responses over ca. 500 s which correctly followed the CO tolerances determined from EHPs (PtRu/C > Pt/C > PtNi/C). A model of the kinetic transient responses on the floating electrode is provided which aids in describing the catalytic behaviour in poisoned environments.
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