Effect of Electrolyte Thickness on Electrochemical Reactions and Thermo-Fluidic Characteristics inside a SOFC Unit Cell

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We investigated the effect of electrolyte thickness and operating temperature on the heat and mass transfer characteristics of solid oxide fuel cells. We conducted extensive numerical simulations to analyze single cell performance of a planar solid oxide fuel cell (SOFC) with electrolyte thicknesses from 80 to 100 mu m and operating temperatures between 700 degrees C and 800 degrees C. The commercial computational fluid dynamics (CFD) code was utilized to simulate the transport behavior and electrochemical reactions. As expected, the maximum power density increased with decreasing electrolyte thickness, and the difference became significant when the current density increased among different electrolyte thicknesses at a fixed temperature. Thinner electrolytes are beneficial for volumetric power density due to lower ohmic loss. Moreover, the SOFC performance enhanced with increasing operating temperature, which substantially changed the reaction rate along the channel direction. This study can be used to help design SOFC stacks to achieve enhanced heat and mass transfer during operation.
Publisher
MDPI
Issue Date
2018-03
Language
English
Article Type
Article
Keywords

OXIDE FUEL-CELL; 3-DIMENSIONAL NUMERICAL SIMULATIONS; PERFORMANCE ANALYSIS; HEAT-TRANSFER; CFD ANALYSIS; BUTTON CELL; OPTIMIZATION; MODEL; ANODE; TRANSPORT

Citation

ENERGIES, v.11, no.3

ISSN
1996-1073
DOI
10.3390/en11030473
URI
http://hdl.handle.net/10203/245712
Appears in Collection
ME-Journal Papers(저널논문)
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