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Title: Performance of solid oxide fuel cells approaching the two-dimensional limit

We model electrochemical kinetics and physical conduction mechanisms for carrier transport in electrolyte membranes to determine the limits of dimensionality reduction (down to 1 nm) on maximum power output of solid oxide fuel cells with symmetric Pt electrodes. Using Y-doped ZrO{sub 2}, we find a minimum thickness of ∼6 nm to realize near ideal chemical potential in such fuel cells, which is limited by electronic breakdown when approaching the dielectric breakdown strength. For larger electrolyte thicknesses, the greatest source of electronic leakage influencing power loss is from Ohmic transport of minority carriers and emission of trapped carriers. For porous metallic electrodes, an ideal microstructure with the particle size comparable to particle spacing dimensions is found to accurately model experimental results. The role of electronic trap states in the electrolyte band gap on power density characteristics is highlighted.
Authors:
;  [1]
  1. School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138 (United States)
Publication Date:
OSTI Identifier:
22273458
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 17; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; CHARGE CARRIERS; COMPARATIVE EVALUATIONS; DIELECTRIC MATERIALS; DOPED MATERIALS; ELECTRIC CONDUCTIVITY; ELECTROCHEMISTRY; ELECTRODES; ELECTROLYTES; MEMBRANES; MICROSTRUCTURE; PARTICLE SIZE; PERFORMANCE; POROUS MATERIALS; POTENTIALS; POWER DENSITY; POWER LOSSES; SOLID OXIDE FUEL CELLS; THICKNESS; TRAPPING; ZIRCONIUM OXIDES