Effect of phosphoric acid purity on the electrochemically active surface area of Pt-based electrodes
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F22%3A43924271" target="_blank" >RIV/60461373:22310/22:43924271 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1016/j.jelechem.2022.116450" target="_blank" >https://doi.org/10.1016/j.jelechem.2022.116450</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.jelechem.2022.116450" target="_blank" >10.1016/j.jelechem.2022.116450</a>
Alternative languages
Result language
angličtina
Original language name
Effect of phosphoric acid purity on the electrochemically active surface area of Pt-based electrodes
Original language description
In this work, the effect of H3PO4 purity on the activity of Pt/C thin film catalysts towards the oxygen reduction reaction (ORR) was investigated. H3PO4 is routinely introduced in the electrolyte during rotating disk electrode (RDE) measurements to simulate the existing environment within high-temperature proton exchange membrane fuel cells (HT-PEMFC). Three different purity grades were tested: crystalline (99.99% purity), commercial H3PO4 solution (85 wt%), hereafter, designated as non-purified H3PO4, and commercial H3PO4 solution (85 wt%) purified with H2O2. H3PO4 and/or its anions are known to strongly adsorb and interact with Pt surfaces. The presence of H3PO4 negatively affected the electrochemically active surface area (ECSA) measured by Hupd (ECSAH), and by CO stripping (ECSACO), kinetic parameters in the high current density region and the limiting current density (jlim) of ORR. One major finding was that the crystalline and purified H3PO4 solutions have similar effects on the Pt/C catalyst activity while the non–purified H3PO4 showed a significantly more negative effect on the ECSA as well as on the ORR measurements. This was found to be due to the presence of H3PO3 in the non-purified H3PO4 solution. Adsorption isotherms of H3PO3 were also measured using Hupd and CO stripping in order to evaluate its adsorption on the catalyst surface. From these investigations, the purity level of H3PO4 was shown to be an important factor in reliable ORR testing. © 2022 Elsevier B.V.
Czech name
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Czech description
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Classification
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)
Result continuities
Project
<a href="/en/project/GC19-02964J" target="_blank" >GC19-02964J: Electrochemistry of Pt - P oxoacids interface as a key to understanding of high temperature PEM fuel cells performance</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
ISSN
1572-6657
e-ISSN
1873-2569
Volume of the periodical
918
Issue of the periodical within the volume
Neuveden
Country of publishing house
US - UNITED STATES
Number of pages
11
Pages from-to
nestrankovano
UT code for WoS article
000817795100008
EID of the result in the Scopus database
2-s2.0-85131449053