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A validated multi‐scale model of a SOFC stack at elevated pressure
Author(s) -
Henke M.,
Willich C.,
Westner C.,
Leucht F.,
Kallo J.,
Bessler W. G.,
Friedrich K. A.
Publication year - 2013
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/fuce.201300076
Subject(s) - stack (abstract data type) , anode , cathode , isothermal process , materials science , solid oxide fuel cell , polarization (electrochemistry) , fuel cells , electrical impedance , thermodynamics , analytical chemistry (journal) , nuclear engineering , mechanics , electrode , chemistry , chemical engineering , computer science , electrical engineering , physics , chromatography , programming language , engineering
This paper presents a multi‐scale model of a solid oxide fuel cell (SOFC) stack consisting of five anode‐supported cells. A two‐dimensional isothermal elementary kinetic model is used to calculate the performance of single cells. Several of these models are thermally coupled to form the stack model. Simulations can be carried out at steady‐state as well as dynamic operation. The model is validated over a wide range of operating conditions including variation of temperature, gas composition (both on anode and cathode side), and pressure. Validation is carried out using polarization curves and impedance spectra. The model is then used to explain the pressure‐induced performance increase measured at constant fuel utilization of 40%. Results show that activation and concentration overpotentials are reduced with increasing pressure.