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Influence of Pressurisation on SOFC Performance and Durability: A Theoretical Study

Henke, Moritz and Kallo, Josef and Friedrich, K. Andreas and Bessler, Wolfgang G. (2011) Influence of Pressurisation on SOFC Performance and Durability: A Theoretical Study. Fuel Cells, 11 (4), pp. 581-591. Wiley. DOI: 10.1002/fuce.201000098 ISSN 1615-6854

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Abstract

Hybrid power plants consisting of a solid oxide fuel cell (SOFC) and a gas turbine show high electrical efficiencies, however require pressurisation of the SOFC to several bar. This paper presents a theoretical investigation of the pressure influence on SOFC performance and durability. A two-dimensional elementary kinetic model is used to predict the performance of a single cell in the pressure range of 1–20 bar. The influence of pressure on thermodynamics, reaction kinetics, porous electrode diffusion, channel transport and efficiency is assessed. It was found that polarisation resistance decreases with increasing pressure due to increased diffusion through porous electrodes and a higher electrode surface coverage with reactant species. Furthermore, open-circuit voltage increases slightly with pressure. As a consequence, power density and efficiency increase upon pressurisation with the strongest increase at low pressures between 1 and 5 bar. The influence of pressure on two typical degradation mechanisms, nickel oxidation and carbon deposition, is assessed using thermodynamic simulations. Pressurisation facilitates nickel oxidation whereas its effect on carbon deposition strongly depends on temperature.

Item URL in elib:https://elib.dlr.de/70930/
Document Type:Article
Title:Influence of Pressurisation on SOFC Performance and Durability: A Theoretical Study
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Henke, MoritzDLRUNSPECIFIED
Kallo, JosefDLRUNSPECIFIED
Friedrich, K. AndreasDLRUNSPECIFIED
Bessler, Wolfgang G.DLRUNSPECIFIED
Date:2011
Journal or Publication Title:Fuel Cells
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:11
DOI :10.1002/fuce.201000098
Page Range:pp. 581-591
Publisher:Wiley
ISSN:1615-6854
Status:Published
Keywords:Durability, Hybrid Power Plant, Modelling, Overpotentials, Performance, Pressurisation, Simulation, Solid Oxide Fuel Cell (SOFC)
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion (old)
HGF - Program Themes:E VG - Combustion and Gas Turbine Technologies (old), E EV - Energy process technology (old), E BZ - Fuel cells (old)
DLR - Research area:Energy
DLR - Program:E VG - Combustion and Gas Turbine Technologies, E EV - Energy process technology, E BZ - Fuel cells
DLR - Research theme (Project):E - Hybridkraftwerke (old), E - Elektrochemische Prozesse (old), E - Hochtemperatur-Brennstoffzellen (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Henke, Moritz
Deposited On:26 Sep 2011 10:24
Last Modified:06 Sep 2019 15:15

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