In situ Mössbauer spectroscopy on an operating fuel cell

Daniel Alberto Scherson, C. Fierro, E. B. Yeager, M. E. Kordesch, J. Eldridge, R. W. Hoffman, A. Barnes

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

In situ Mössbauer spectroscopy has been utilized to examine an operating high surface area carbon oxygen-fed cathode with preadsorbed iron phthalocyanine (FePc) in alkaline solution. The configuration used was essentially that of a fuel cell with a hydrogen fed electrode as the anode. The results indicated that the isomer shift and quadrupole splitting observed at -200 mV vs. Hg/HgO, OH- during O2 reduction are the same as those obtained at open circuit in the absence of O2 and correspond to adsorbed FePc presumably at monolayer coverages. At higher overpotentials (∼ -300 mV vs Hg/HgO, OH-), however, a fraction of the catalyst is either demetallated or otherwise irreversibly desorbed from the carbon surface, as judged from the observed decrease in the total resonant absorption area. Polarization measurements for reduction of O2 in 4 M NaOH at 60°C with gas-fed high surface area carbon electrodes have indicated that the catalytic activity is increased over that of the carbon alone by adsorbed FePc. The activity is even more enhanced, however, by the presence of crystalline FePc in the porous electrode.

Original languageEnglish
Pages (from-to)287-302
Number of pages16
JournalJournal of Electroanalytical Chemistry
Volume169
Issue number1-2
DOIs
Publication statusPublished - 1984 Jul 10
Externally publishedYes

Fingerprint

Fuel cells
Carbon
Spectroscopy
Electrodes
Isomers
Hydrogen
Monolayers
Catalyst activity
Anodes
Cathodes
Gases
Polarization
Iron
Oxygen
Crystalline materials
Catalysts
Networks (circuits)
hydroxide ion

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

Cite this

Scherson, D. A., Fierro, C., Yeager, E. B., Kordesch, M. E., Eldridge, J., Hoffman, R. W., & Barnes, A. (1984). In situ Mössbauer spectroscopy on an operating fuel cell. Journal of Electroanalytical Chemistry, 169(1-2), 287-302. https://doi.org/10.1016/0022-0728(84)80090-X

In situ Mössbauer spectroscopy on an operating fuel cell. / Scherson, Daniel Alberto; Fierro, C.; Yeager, E. B.; Kordesch, M. E.; Eldridge, J.; Hoffman, R. W.; Barnes, A.

In: Journal of Electroanalytical Chemistry, Vol. 169, No. 1-2, 10.07.1984, p. 287-302.

Research output: Contribution to journalArticle

Scherson, DA, Fierro, C, Yeager, EB, Kordesch, ME, Eldridge, J, Hoffman, RW & Barnes, A 1984, 'In situ Mössbauer spectroscopy on an operating fuel cell', Journal of Electroanalytical Chemistry, vol. 169, no. 1-2, pp. 287-302. https://doi.org/10.1016/0022-0728(84)80090-X
Scherson DA, Fierro C, Yeager EB, Kordesch ME, Eldridge J, Hoffman RW et al. In situ Mössbauer spectroscopy on an operating fuel cell. Journal of Electroanalytical Chemistry. 1984 Jul 10;169(1-2):287-302. https://doi.org/10.1016/0022-0728(84)80090-X
Scherson, Daniel Alberto ; Fierro, C. ; Yeager, E. B. ; Kordesch, M. E. ; Eldridge, J. ; Hoffman, R. W. ; Barnes, A. / In situ Mössbauer spectroscopy on an operating fuel cell. In: Journal of Electroanalytical Chemistry. 1984 ; Vol. 169, No. 1-2. pp. 287-302.
@article{fdd1c93eb14c48c89540fbe9cdd3dcd5,
title = "In situ M{\"o}ssbauer spectroscopy on an operating fuel cell",
abstract = "In situ M{\"o}ssbauer spectroscopy has been utilized to examine an operating high surface area carbon oxygen-fed cathode with preadsorbed iron phthalocyanine (FePc) in alkaline solution. The configuration used was essentially that of a fuel cell with a hydrogen fed electrode as the anode. The results indicated that the isomer shift and quadrupole splitting observed at -200 mV vs. Hg/HgO, OH- during O2 reduction are the same as those obtained at open circuit in the absence of O2 and correspond to adsorbed FePc presumably at monolayer coverages. At higher overpotentials (∼ -300 mV vs Hg/HgO, OH-), however, a fraction of the catalyst is either demetallated or otherwise irreversibly desorbed from the carbon surface, as judged from the observed decrease in the total resonant absorption area. Polarization measurements for reduction of O2 in 4 M NaOH at 60°C with gas-fed high surface area carbon electrodes have indicated that the catalytic activity is increased over that of the carbon alone by adsorbed FePc. The activity is even more enhanced, however, by the presence of crystalline FePc in the porous electrode.",
author = "Scherson, {Daniel Alberto} and C. Fierro and Yeager, {E. B.} and Kordesch, {M. E.} and J. Eldridge and Hoffman, {R. W.} and A. Barnes",
year = "1984",
month = "7",
day = "10",
doi = "10.1016/0022-0728(84)80090-X",
language = "English",
volume = "169",
pages = "287--302",
journal = "Journal of Electroanalytical Chemistry",
issn = "0022-0728",
publisher = "Elsevier Sequoia",
number = "1-2",

}

TY - JOUR

T1 - In situ Mössbauer spectroscopy on an operating fuel cell

AU - Scherson, Daniel Alberto

AU - Fierro, C.

AU - Yeager, E. B.

AU - Kordesch, M. E.

AU - Eldridge, J.

AU - Hoffman, R. W.

AU - Barnes, A.

PY - 1984/7/10

Y1 - 1984/7/10

N2 - In situ Mössbauer spectroscopy has been utilized to examine an operating high surface area carbon oxygen-fed cathode with preadsorbed iron phthalocyanine (FePc) in alkaline solution. The configuration used was essentially that of a fuel cell with a hydrogen fed electrode as the anode. The results indicated that the isomer shift and quadrupole splitting observed at -200 mV vs. Hg/HgO, OH- during O2 reduction are the same as those obtained at open circuit in the absence of O2 and correspond to adsorbed FePc presumably at monolayer coverages. At higher overpotentials (∼ -300 mV vs Hg/HgO, OH-), however, a fraction of the catalyst is either demetallated or otherwise irreversibly desorbed from the carbon surface, as judged from the observed decrease in the total resonant absorption area. Polarization measurements for reduction of O2 in 4 M NaOH at 60°C with gas-fed high surface area carbon electrodes have indicated that the catalytic activity is increased over that of the carbon alone by adsorbed FePc. The activity is even more enhanced, however, by the presence of crystalline FePc in the porous electrode.

AB - In situ Mössbauer spectroscopy has been utilized to examine an operating high surface area carbon oxygen-fed cathode with preadsorbed iron phthalocyanine (FePc) in alkaline solution. The configuration used was essentially that of a fuel cell with a hydrogen fed electrode as the anode. The results indicated that the isomer shift and quadrupole splitting observed at -200 mV vs. Hg/HgO, OH- during O2 reduction are the same as those obtained at open circuit in the absence of O2 and correspond to adsorbed FePc presumably at monolayer coverages. At higher overpotentials (∼ -300 mV vs Hg/HgO, OH-), however, a fraction of the catalyst is either demetallated or otherwise irreversibly desorbed from the carbon surface, as judged from the observed decrease in the total resonant absorption area. Polarization measurements for reduction of O2 in 4 M NaOH at 60°C with gas-fed high surface area carbon electrodes have indicated that the catalytic activity is increased over that of the carbon alone by adsorbed FePc. The activity is even more enhanced, however, by the presence of crystalline FePc in the porous electrode.

UR - http://www.scopus.com/inward/record.url?scp=0021468406&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0021468406&partnerID=8YFLogxK

U2 - 10.1016/0022-0728(84)80090-X

DO - 10.1016/0022-0728(84)80090-X

M3 - Article

AN - SCOPUS:0021468406

VL - 169

SP - 287

EP - 302

JO - Journal of Electroanalytical Chemistry

JF - Journal of Electroanalytical Chemistry

SN - 0022-0728

IS - 1-2

ER -