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

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

Researchers

  • R. Jäger
  • P. E. Kasatkin
  • E. Härk
  • I. Tallo
  • Tanja Kallio

  • Hua Jiang

  • J. Aruväli
  • U. Joost
  • P. Paiste
  • R. Kanarbik
  • K. Kirsimäe
  • E. Lust

Research units

  • University of Tartu

Abstract

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.

Details

Original languageEnglish
Title of host publicationSelected Proceedings from the 231st ECS Meeting New Orleans, LA - Spring 2017
Publication statusPublished - 2017
MoE publication typeA4 Article in a conference publication
EventElectrochemical Society Meeting - New Orleans, United States
Duration: 28 May 20171 Jun 2017
Conference number: 231

Publication series

NameECS Transactions
PublisherElectrochemical Society
Number11
Volume77
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Conference

ConferenceElectrochemical Society Meeting
CountryUnited States
CityNew Orleans
Period28/05/201701/06/2017

ID: 15933018