Methodology of evaluating the activation energy of oxygen reduction reaction on Pt-based electrodes

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F25%3A43932256" target="_blank" >RIV/60461373:22310/25:43932256 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.jelechem.2025.119418" target="_blank" >https://doi.org/10.1016/j.jelechem.2025.119418</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jelechem.2025.119418" target="_blank" >10.1016/j.jelechem.2025.119418</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Methodology of evaluating the activation energy of oxygen reduction reaction on Pt-based electrodes

Popis výsledku v původním jazyce

Proton-exchange membrane fuel cells (PEMFCs) operating at low (LT-PEMFC) and high temperatures (HT-PEMFC) both face the challenge of slow kinetics of the oxygen reduction reaction (ORR) at the cathode. While HT-PEMFCs offer advantages such as better heat management, lower hydrogen purity requirements, and easier water management, their operation at elevated temperatures (160–200 °C) introduces difficulties due to the presence of concentrated H₃PO₄. This study presents a methodology for determining the activation energy (E‡) of ORR. Determination of the kinetic parameters requires correct assessment of equilibrium potential of ORR (EORR). The value of the EORR is generally influenced by the activity of the reactants and products, as well as by the temperature. A discussion of the appropriate standard states of the components is also necessary. Using linear sweep voltammetry (LSV), the exchange current density (jex) and Tafel slope were determined on a rotating electrode. The methodology was first validated on data obtained using Pt rotating disk electrode (RDE) in 0.1 M HClO4 at temperatures from 5 to 60 °C. Then, it was applied also on a more complex HT-PEMFCs-relevant environment of 98 wt% H3PO4 at elevated temperatures (120–180 °C) and a limitation of using of this methodology in this system was discussed. The developed methodology offers a more accurate calculation of E‡ and provides a general framework applicable to any electrochemical reaction where specific information about reaction mechanism, reactants and products concentrations as well as RDS are known.

Název v anglickém jazyce

Methodology of evaluating the activation energy of oxygen reduction reaction on Pt-based electrodes

Popis výsledku anglicky

Proton-exchange membrane fuel cells (PEMFCs) operating at low (LT-PEMFC) and high temperatures (HT-PEMFC) both face the challenge of slow kinetics of the oxygen reduction reaction (ORR) at the cathode. While HT-PEMFCs offer advantages such as better heat management, lower hydrogen purity requirements, and easier water management, their operation at elevated temperatures (160–200 °C) introduces difficulties due to the presence of concentrated H₃PO₄. This study presents a methodology for determining the activation energy (E‡) of ORR. Determination of the kinetic parameters requires correct assessment of equilibrium potential of ORR (EORR). The value of the EORR is generally influenced by the activity of the reactants and products, as well as by the temperature. A discussion of the appropriate standard states of the components is also necessary. Using linear sweep voltammetry (LSV), the exchange current density (jex) and Tafel slope were determined on a rotating electrode. The methodology was first validated on data obtained using Pt rotating disk electrode (RDE) in 0.1 M HClO4 at temperatures from 5 to 60 °C. Then, it was applied also on a more complex HT-PEMFCs-relevant environment of 98 wt% H3PO4 at elevated temperatures (120–180 °C) and a limitation of using of this methodology in this system was discussed. The developed methodology offers a more accurate calculation of E‡ and provides a general framework applicable to any electrochemical reaction where specific information about reaction mechanism, reactants and products concentrations as well as RDS are known.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10406 - Analytical chemistry

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2025

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

996

Číslo periodika v rámci svazku

November 2025

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

13

Strana od-do

1-13

Kód UT WoS článku

001564136000001

EID výsledku v databázi Scopus

2-s2.0-105014531390