Studies on PEM fuel cell noble metal catalyst dissolution

S. M. Andersen, L. Grahl-Madsen, E. M. Skou

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

A combination of electrochemical, spectroscopic and gravimetric methods was carried out on Proton Exchange Membrane (PEM) fuel cell electrodes with the focus on platinum and ruthenium catalysts dissolution, and the membrane degradation. In cyclic voltammetry (CV) experiments, the noble metals were found to dissolve in 1 M sulfuric acid solution and the dissolution increased exponentially with the upper potential limit (UPL) between 0.6 and 1.6 vs. RHE. 2-20% of the Pt (depending on the catalyst type) was found to be dissolved during the experiments. Under the same conditions, 30-100% of the Ru (depending on the catalyst type) was found to be dissolved. The faster dissolution of ruthenium compared to platinum in the alloy type catalysts was also confirmed by X-ray diffraction measurements. The dissolution of the carbon supported catalyst was found one order of magnitude higher than the unsupported catalyst. Other factors like medium acidity, chloride content and oxygen partial pressure all turned out to influence the noble metal dissolution. The degradation of the polyfluorinated sulfonic acid membrane electrolyte was also found to be an important source of increased acidity in the Three-Phase-Boundary (TPB), and consequently the dissolution of the noble metal catalysts. (C) 2010 Elsevier B.V. All rights reserved.
Original languageEnglish
JournalSolid State Ionics
Volume192
Issue number1
Pages (from-to)602-606
Number of pages5
ISSN0167-2738
DOIs
Publication statusPublished - 2011

Cite this

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title = "Studies on PEM fuel cell noble metal catalyst dissolution",
abstract = "A combination of electrochemical, spectroscopic and gravimetric methods was carried out on Proton Exchange Membrane (PEM) fuel cell electrodes with the focus on platinum and ruthenium catalysts dissolution, and the membrane degradation. In cyclic voltammetry (CV) experiments, the noble metals were found to dissolve in 1 M sulfuric acid solution and the dissolution increased exponentially with the upper potential limit (UPL) between 0.6 and 1.6 vs. RHE. 2-20{\%} of the Pt (depending on the catalyst type) was found to be dissolved during the experiments. Under the same conditions, 30-100{\%} of the Ru (depending on the catalyst type) was found to be dissolved. The faster dissolution of ruthenium compared to platinum in the alloy type catalysts was also confirmed by X-ray diffraction measurements. The dissolution of the carbon supported catalyst was found one order of magnitude higher than the unsupported catalyst. Other factors like medium acidity, chloride content and oxygen partial pressure all turned out to influence the noble metal dissolution. The degradation of the polyfluorinated sulfonic acid membrane electrolyte was also found to be an important source of increased acidity in the Three-Phase-Boundary (TPB), and consequently the dissolution of the noble metal catalysts. (C) 2010 Elsevier B.V. All rights reserved.",
author = "Andersen, {S. M.} and L. Grahl-Madsen and Skou, {E. M.}",
year = "2011",
doi = "10.1016/j.ssi.2010.09.010",
language = "English",
volume = "192",
pages = "602--606",
journal = "Solid State Ionics",
issn = "0167-2738",
publisher = "Elsevier",
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}

Studies on PEM fuel cell noble metal catalyst dissolution. / Andersen, S. M.; Grahl-Madsen, L.; Skou, E. M.

In: Solid State Ionics, Vol. 192, No. 1, 2011, p. 602-606.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Studies on PEM fuel cell noble metal catalyst dissolution

AU - Andersen, S. M.

AU - Grahl-Madsen, L.

AU - Skou, E. M.

PY - 2011

Y1 - 2011

N2 - A combination of electrochemical, spectroscopic and gravimetric methods was carried out on Proton Exchange Membrane (PEM) fuel cell electrodes with the focus on platinum and ruthenium catalysts dissolution, and the membrane degradation. In cyclic voltammetry (CV) experiments, the noble metals were found to dissolve in 1 M sulfuric acid solution and the dissolution increased exponentially with the upper potential limit (UPL) between 0.6 and 1.6 vs. RHE. 2-20% of the Pt (depending on the catalyst type) was found to be dissolved during the experiments. Under the same conditions, 30-100% of the Ru (depending on the catalyst type) was found to be dissolved. The faster dissolution of ruthenium compared to platinum in the alloy type catalysts was also confirmed by X-ray diffraction measurements. The dissolution of the carbon supported catalyst was found one order of magnitude higher than the unsupported catalyst. Other factors like medium acidity, chloride content and oxygen partial pressure all turned out to influence the noble metal dissolution. The degradation of the polyfluorinated sulfonic acid membrane electrolyte was also found to be an important source of increased acidity in the Three-Phase-Boundary (TPB), and consequently the dissolution of the noble metal catalysts. (C) 2010 Elsevier B.V. All rights reserved.

AB - A combination of electrochemical, spectroscopic and gravimetric methods was carried out on Proton Exchange Membrane (PEM) fuel cell electrodes with the focus on platinum and ruthenium catalysts dissolution, and the membrane degradation. In cyclic voltammetry (CV) experiments, the noble metals were found to dissolve in 1 M sulfuric acid solution and the dissolution increased exponentially with the upper potential limit (UPL) between 0.6 and 1.6 vs. RHE. 2-20% of the Pt (depending on the catalyst type) was found to be dissolved during the experiments. Under the same conditions, 30-100% of the Ru (depending on the catalyst type) was found to be dissolved. The faster dissolution of ruthenium compared to platinum in the alloy type catalysts was also confirmed by X-ray diffraction measurements. The dissolution of the carbon supported catalyst was found one order of magnitude higher than the unsupported catalyst. Other factors like medium acidity, chloride content and oxygen partial pressure all turned out to influence the noble metal dissolution. The degradation of the polyfluorinated sulfonic acid membrane electrolyte was also found to be an important source of increased acidity in the Three-Phase-Boundary (TPB), and consequently the dissolution of the noble metal catalysts. (C) 2010 Elsevier B.V. All rights reserved.

U2 - 10.1016/j.ssi.2010.09.010

DO - 10.1016/j.ssi.2010.09.010

M3 - Journal article

VL - 192

SP - 602

EP - 606

JO - Solid State Ionics

JF - Solid State Ionics

SN - 0167-2738

IS - 1

ER -