Stability issues of CO tolerant Pt-based electrocatalysts for polymer electrolyte membrane fuel cells

comparison of Pt/Ti0.8Mo0.2O2–C with PtRu/C

Research output: Contribution to journalArticle

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.

Original languageEnglish
JournalReaction Kinetics, Mechanisms and Catalysis
DOIs
Publication statusAccepted/In press - Jan 1 2018

Fingerprint

electrocatalysts
Electrocatalysts
Proton exchange membrane fuel cells (PEMFC)
Carbon Monoxide
fuel cells
electrolytes
membranes
catalysts
Catalysts
polymers
Degradation
Ruthenium
degradation
Composite materials
Voltammetry
stability tests
Catalyst supports
composite materials
Cyclic voltammetry
Dissolution

Keywords

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

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

Cite this

@article{d38f4c907f62416db120091ec606ad78,
title = "Stability issues of CO tolerant Pt-based electrocatalysts for polymer electrolyte membrane fuel cells: comparison of Pt/Ti0.8Mo0.2O2–C with PtRu/C",
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 = "CO-tolerance, Composite materials, Conducting Ti-based mixed oxides, Pt electrocatalysts, PtRu/C, TiMoO",
author = "{\'A}d{\'a}m Vass and I. Borb{\'a}th and I. Bakos and Z. P{\'a}szti and G. S{\'a}fr{\'a}n and A. Tompos",
year = "2018",
month = "1",
day = "1",
doi = "10.1007/s11144-018-1512-z",
language = "English",
journal = "Reaction Kinetics, Mechanisms and Catalysis",
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publisher = "Springer Netherlands",

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TY - JOUR

T1 - Stability issues of CO tolerant Pt-based electrocatalysts for polymer electrolyte membrane fuel cells

T2 - comparison of Pt/Ti0.8Mo0.2O2–C with PtRu/C

AU - Vass, Ádám

AU - Borbáth, I.

AU - Bakos, I.

AU - Pászti, Z.

AU - Sáfrán, G.

AU - Tompos, A.

PY - 2018/1/1

Y1 - 2018/1/1

N2 - 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.

AB - 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.

KW - CO-tolerance

KW - Composite materials

KW - Conducting Ti-based mixed oxides

KW - Pt electrocatalysts

KW - PtRu/C

KW - TiMoO

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