The influence of the oxygen partial pressure on the oxygen reduction reaction kinetics for the low platinum loading catalysts

R. Jäger, P. E. Kasatkin, E. Härk, I. Tallo, T. Kallio, H. Jiang, J. Aruväli, U. Joost, P. Paiste, R. Kanarbik, K. Kirsimäe, E. Lust

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review


Two different platinum catalysts (8.3 and 12.4wt% Pt based on molybdenum carbide derived carbon) were characterized by the high resolution transmission electron microscopy and X-ray diffraction methods. The oxygen reduction reaction (ORR) kinetics was studied on synthesized catalysts and commercially available 20wt% Pt-Vulcan in 0.1M KOH electrolyte solution saturated with oxygen or various O2/N2 gas mixtures at atmospheric pressure. The current density values increase five-fold as the oxygen concentration increases from 20% to 100%. This refers to firstorder reaction with respect of oxygen for all catalyst studied. Two different approaches have been proposed for calculating the reaction order. The ORR electrochemical activity for catalysts increases in the following sequence: 8.3wt% Pt-C (half of the loading) ≤ 20wt% Pt-Vulcan < 8.3wt% Pt-C ≈ 12.4wt% Pt-C at all O2 partial pressures studied. The most promising catalyst for ORR was found to be 8.3 wt% Pt-C.

Original languageEnglish
Title of host publicationSelected Proceedings from the 231st ECS Meeting New Orleans, LA - Spring 2017
PublisherThe Electrochemical Society
Number of pages8
ISBN (Electronic)9781607685395
Publication statusPublished - 2017
MoE publication typeA4 Article in a conference publication
EventElectrochemical Society Meeting - New Orleans, United States
Duration: 28 May 20172 Jun 2017
Conference number: 231

Publication series

NameECS Transactions
PublisherElectrochemical Society
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737


ConferenceElectrochemical Society Meeting
Abbreviated titleECS
CountryUnited States
CityNew Orleans
Internet address


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