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

研究成果: Article査読

8 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)287-302
ページ数16
ジャーナルJournal of Electroanalytical Chemistry
169
1-2
DOI
出版ステータスPublished - 1984 7 10
外部発表はい

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

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