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Title: Chromium reactions and transport in solid oxide fuel cells.

Abstract

No abstract prepared.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
FE
OSTI Identifier:
947073
Report Number(s):
ANL/CMT/JA-58305
TRN: US200903%%1022
DOE Contract Number:
DE-AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: 30th Anniversary Fuel Cell Seminar issue of ECS Trans.; Journal Volume: 5; Journal Issue: 1 ; 2007
Country of Publication:
United States
Language:
ENGLISH
Subject:
30 DIRECT ENERGY CONVERSION; CHROMIUM; SOLID OXIDE FUEL CELLS; TRANSPORT

Citation Formats

Cruse, T. A., Ingram, B. J., Liu, D. J., Krumpelt, M., and Chemical Engineering. Chromium reactions and transport in solid oxide fuel cells.. United States: N. p., 2007. Web. doi:10.1149/1.2729015.
Cruse, T. A., Ingram, B. J., Liu, D. J., Krumpelt, M., & Chemical Engineering. Chromium reactions and transport in solid oxide fuel cells.. United States. doi:10.1149/1.2729015.
Cruse, T. A., Ingram, B. J., Liu, D. J., Krumpelt, M., and Chemical Engineering. Mon . "Chromium reactions and transport in solid oxide fuel cells.". United States. doi:10.1149/1.2729015.
@article{osti_947073,
title = {Chromium reactions and transport in solid oxide fuel cells.},
author = {Cruse, T. A. and Ingram, B. J. and Liu, D. J. and Krumpelt, M. and Chemical Engineering},
abstractNote = {No abstract prepared.},
doi = {10.1149/1.2729015},
journal = {30th Anniversary Fuel Cell Seminar issue of ECS Trans.},
number = 1 ; 2007,
volume = 5,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}
  • We present a pore scale model of a solid oxide fuel cell (SOFC) cathode. Volatile chromium species are known to migrate from the current collector of the SOFC into the cathode where over time they decrease the voltage output of the fuel cell. A pore scale model is used to investigate the reactive transport of chromium species in the cathode and to study the driving forces of chromium poisoning. A multi-scale modeling approach is proposed which uses a cell level model of the cathode, air channel and current collector to determine the boundary conditions for a pore scale model ofmore » a section of the cathode. The pore scale model uses a discrete representation of the cathode to explicitly model the surface reactions of oxygen and chromium with a cathode material. The pore scale model is used to study the reaction mechanisms of chromium by considering the effects of reaction rates, diffusion coefficients, chromium vaporization, and oxygen consumption on chromium’s deposition in the cathode. The study shows that chromium poisoning is most significantly affected by the chromium reaction rates in the cathode and that the reaction rates are a function of the local current density in the cathode.« less
  • No abstract prepared.
  • Hexavalent chromium species like the oxyhydroxide, CrO{sub 2}(OH){sub 2}, or hexoxide, CrO{sub 3}, are electrochemically reduced to Cr{sub 2}O{sub 3} in solid oxide fuel cells and adversely affect the cell operating potentials. Using a narrowly focused beam from the Advanced Photon Source, such chromium oxide deposits were unequivocally identified in the active region of the cathode by X-ray diffraction, suggesting that the triple phase boundaries were partially blocked. Under fuel cell operating conditions, the reaction has an equilibrium potential of about 0.9 V and the rate of chromium oxide deposition is therefore dependent on the operating potential of the cell.more » It becomes diffusion limited after several hours of steady operation. At low operating potentials, lanthanum manganite cathodes begin to be reduced to MnO, which reacts with the chromium oxide to form the MnCr{sub 2}O{sub 4} spinel.« less