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

Result code in 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>

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10406 - Analytical chemistry

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)

Publication year

2025

Confidentiality

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

Name of the periodical

Journal of Electroanalytical Chemistry

ISSN

1572-6657

e-ISSN

1873-2569

Volume of the periodical

996

Issue of the periodical within the volume

November 2025

Country of publishing house

CH - SWITZERLAND

Number of pages

13

Pages from-to

1-13

UT code for WoS article

001564136000001

EID of the result in the Scopus database

2-s2.0-105014531390