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Stability issues of CO tolerant Pt-based electrocatalysts for polymer electrolyte membrane fuel cells: comparison of Pt/Ti0.8Mo0.2O2–C with PtRu/C

  • Ádám Vass
  • Irina Borbáth
  • István Bakos
  • Zoltán Pászti
  • György Sáfrán
  • András Tompos
Article
  • 16 Downloads

Abstract

The stability and CO tolerance of a self-made 20 wt% Pt/Ti0.8Mo0.2O2–C mixed oxide–carbon composite supported electrocatalyst was compared to those of a commercial state-of-the-art PtRu/C electrocatalyst by means of cyclic voltammetry and COads stripping voltammetry measurements. On the Pt/Ti0.8Mo0.2O2–C catalyst the oxidation of CO takes place at exceptionally low potential values (ECO,onset = 50 mV); the onset potential is shifted to less positive potentials by 150 mV compared to the PtRu/C catalyst. A stability test involving 500 polarization cycles revealed that the PtRu/C catalyst suffered more significant degradation than the composite supported Pt catalyst. XPS measurements indicated that the degradation is connected to ruthenium dissolution. At the same time, better electrocatalytic stability and increased CO tolerance of the Pt/Ti0.8Mo0.2O2–C electrocatalyst compared to the PtRu/C catalyst was evidenced.

Keywords

Conducting Ti-based mixed oxides TiMoOx Composite materials Pt electrocatalysts PtRu/C CO-tolerance 

Notes

Acknowledgements

The research within Project No. VEKOP-2.3.2-16-2017-00013 was supported by the European Union and the State of Hungary, co-financed by the European Regional Development Fund. Financial support by the OTKA-project [Grant Number K112034 (István Bakos)] is greatly acknowledged.

Supplementary material

11144_2018_1512_MOESM1_ESM.docx (412 kb)
Supplementary material 1 (DOCX 412 kb)

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2018

Authors and Affiliations

  • Ádám Vass
    • 1
  • Irina Borbáth
    • 1
    • 3
  • István Bakos
    • 1
  • Zoltán Pászti
    • 1
  • György Sáfrán
    • 2
  • András Tompos
    • 1
  1. 1.Institute of Materials and Environmental Chemistry, Research Centre for Natural SciencesHungarian Academy of SciencesBudapestHungary
  2. 2.Institute for Technical Physics and Materials Science, Centre for Energy ResearchHungarian Academy of SciencesBudapestHungary
  3. 3.BudapestHungary

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