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  Kinetic Insights over a PEMFC Operating on Stationary and Oscillatory States

Mota Lima, A. B., Gonzalez, E. R., & Eiswirth, M. (2011). Kinetic Insights over a PEMFC Operating on Stationary and Oscillatory States. The Journal of Physical Chemistry A, 115(47), 13773-13782. doi:10.1021/jp205341w.

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 Creators:
Mota Lima, Andressa Bastos1, 2, Author           
Gonzalez, Ernesto R.2, Author
Eiswirth, Markus1, 3, Author           
Affiliations:
1Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              
2Instituto de Química de S~ao Carlos, Av. Trab. Sancarlense 400, CEP 13560-970, S~ao Carlos-SP, Brazil, ou_persistent22              
3Ertl Center for Electrochemistry and Catalysis, GIST, Cheomdan-gwagiro 261, Buk-gu, Gwangju 500-712, South Korea, ou_persistent22              

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Language(s): eng - English
 Dates: 2011
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: Kinetic investigations in the oscillatory state have been carried out in order to shed light on the interplay between the complex kinetics exhibited by a proton exchange membrane fuel cell fed with poisoned H2 (108 ppm of CO) and the other in serie process. The apparent activation energy (Ea) in the stationary state was investigated in order to clarify the Ea observed in the oscillatory state. The apparent activation energy in the stationary state, under potentiostatic control, rendered (a) Ea ≈ 50–60 kJ mol–1 over 0.8 V < E < 0.6 V and (b) Ea ≈ 10 kJ mol–1 at E = 0.3 V. The former is related to the H2 adsorption in the vacancies of the surface poisoned by CO and the latter is correlated to the process of proton conductivity in the membrane. The dependence of the period-one oscillations on the temperature yielded a genuine Arrhenius dependence with two Ea values: (a) Ea around 70 kJ mol–1, at high temperatures, and (b) Ea around 10–15 kJ mol–1, at lower temperatures. The latter Ea indicates the presence of protonic mass transport coupled to the essential oscillatory mechanism. These insights point in the right direction to predict spatial couplings between anode and cathode as having the highest strength as well as to speculate the most likely candidates to promote spatial inhomogeneities.
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/jp205341w
 Degree: -

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Title: The Journal of Physical Chemistry A
  Other : J. Phys. Chem. A
Source Genre: Journal
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Publ. Info: Columbus, OH : American Chemical Society
Pages: - Volume / Issue: 115 (47) Sequence Number: - Start / End Page: 13773 - 13782 Identifier: ISSN: 1089-5639
CoNE: https://pure.mpg.de/cone/journals/resource/954926947766_4