Degradation kinetics of Pt during high-temperature PEM fuel cell operation part I: Kinetics of Pt surface oxidation and dissolution in concentrated H3PO4 electrolyte at elevated temperatures

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F19%3A43918382" target="_blank" >RIV/60461373:22310/19:43918382 - isvavai.cz</a>
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S0013468619308321?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0013468619308321?via%3Dihub</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.electacta.2019.04.144" target="_blank" >10.1016/j.electacta.2019.04.144</a>

Result language
angličtina
Original language name
Degradation kinetics of Pt during high-temperature PEM fuel cell operation part I: Kinetics of Pt surface oxidation and dissolution in concentrated H3PO4 electrolyte at elevated temperatures
Original language description
In this work, a combined approach, utilising both experimental cyclic voltammetry and mathematical modelling, was adopted in order to determine the kinetics of Pt oxidation to PtO and chemical dissolution of PtO to Pt2+ in concentrated H3PO4 at elevated temperatures. Experimental cyclic voltammograms were corrected for chemical dissolution of PtO based on a charge balance calculation and the corresponding kinetic constant was evaluated. The corrected voltammograms were compared with the results of a 0-dimensional dynamic model of electrochemical Pt oxidation and the kinetic parameters of this reaction were evaluated. Finally, the two surface reactions were integrated into a mathematical model. This model is able to simulate cyclic voltammograms of Pt in concentrated H3PO4 electrolyte within the temperature range of 120-160 degrees C. It was shown that Pt electrochemical oxidation is the dominating reaction on the Pt surface, based on total recorded charge. However, the chemical dissolution of PtO is by no means negligible, since as much as 10% of the PtO monolayer formed can chemically dissolve under specific conditions. (C) 2019 Elsevier Ltd. All rights reserved.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10405 - Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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