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Modeling ammonia-fueled co-flow dual-channel protonic-ceramic fuel cells

Journal Article · · International Journal of Green Energy
 [1];  [2];  [1]
  1. Colorado School of Mines, Golden, CO (United States)
  2. Colorado School of Mines, Golden, CO (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
This paper reports the model development for a dual-channel protonic-ceramic fuel cell (PCFC) operating on ammonia fuel. The model considers the coupled interactions of several physical and chemical processes, including three-dimensional heat conduction within the bipolar plates and the membrane-electrode assembly (MEA), one-dimensional flow within the fuel and air channels, detailed heterogeneous catalytic reactions within the porous composite anode structure, Butler–Volmer representation of the charge-transfer chemistry, and Nernst–Planck transport of three charged defects (protons, oxygen vacancies, and small polarons) within the dense electrolyte membrane. The membrane-electrode assembly is composed of a Ni-BCZYYb (BaCe0.7Zr0.1Y0.1Yb0.1O3-δ) anode, a BCZYYb electrolyte membrane, and a BCFZY (BaCo0.4Fe0.4Zr0.1Y0.1O3-δ) cathode. Chemical and physical parameters for the MEA model are established using previously published button-cell data. One aspect of the study is to investigate the partial ammonia decomposition upstream of the fuel cell. Such fuel cracking increases the H2 content of the fuel entering the PCFC, which may have benefits. However, endothermic ammonia pyrolysis within the composite anode structure assists with thermal control of the cell. The dual-channel model can be considered as the unit cell of a full fuel-cell stack.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1856714
Alternate ID(s):
OSTI ID: 1860564
Journal Information:
International Journal of Green Energy, Journal Name: International Journal of Green Energy Journal Issue: 14 Vol. 19; ISSN 1543-5075
Publisher:
Taylor & FrancisCopyright Statement
Country of Publication:
United States
Language:
English

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