Effect of phosphoric acid purity on the electrochemically active surface area of Pt-based electrodes

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Effect of phosphoric acid purity on the electrochemically active surface area of Pt-based electrodes

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Effect of phosphoric acid purity on the electrochemically active surface area of Pt-based electrodes

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10405 - Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)

Projekt

<a href="/cs/project/GC19-02964J" target="_blank" >GC19-02964J: Elektrochemie rozhraní Pt - oxokyseliny fosforu jako klíč k pochopení výkonosti vysokoteplotních palivových článků s protonově vodivou membránou</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

JOURNAL OF ELECTROANALYTICAL CHEMISTRY

ISSN

1572-6657

e-ISSN

1873-2569

Svazek periodika

918

Číslo periodika v rámci svazku

Neuveden

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

11

Strana od-do

nestrankovano

Kód UT WoS článku

000817795100008

EID výsledku v databázi Scopus

2-s2.0-85131449053