A model-based understanding of solid-oxide electrolysis cells (SOECs) for syngas production by H2O/CO2 co-electrolysis

Menon, V and Fu, Q and Janardhanan, V and Deutschmann, O (2015) A model-based understanding of solid-oxide electrolysis cells (SOECs) for syngas production by H2O/CO2 co-electrolysis. Journal of Power Sources, 274. pp. 768-781. ISSN 0378-7753

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Abstract

High temperature co-electrolysis of H2O and CO2 offers a promising route for syngas (H2, CO) production via efficient use of heat and electricity. The performance of a SOEC during co-electrolysis is investigated by focusing on the interactions between transport processes and electrochemical parameters. Electrochemistry at the three-phase boundary is modeled by a modified Butler-Volmer approach that considers H2O electrolysis and CO2 electrolysis, individually, as electrochemically active charge transfer pathways. The model is independent of the geometrical structure. A 42-step elementary heterogeneous reaction mechanism for the thermo-catalytic chemistry in the fuel electrode, the dusty gas model (DGM) to account for multi-component diffusion through porous media, and a plug flow model for flow through the channels are used in the model. Two sets of experimental data are reproduced by the simulations, in order to deduce parameters of the electrochemical model. The influence of micro-structural properties, inlet cathode gas velocity, and temperature are discussed. Reaction flow analysis is performed, at OCV, to study methane production characteristics and kinetics during co-electrolysis. Simulations are carried out for configurations ranging from simple one-dimensional electrochemical button cells to quasi-two-dimensional co-flow planar cells, to demonstrate the effectiveness of the computational tool for performance and design optimization.

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IITH Creators:

IITH Creators	ORCiD
Janardhanan, V	http://orcid.org/0000-0002-3458-4169

Item Type:

Article

Additional Information:

We thank the Steinbeis GmbH für Technologietransfer (STZ 240 Reaktive Strömungen) for a cost free academic license of DETCHEM™. We deeply value for all the rewarding exchanges on SOCs with Dr. Alexander Kromp (IWE, KIT). We are also indebted to Dr. L. Maier and Ms. K. Herrera Delgado (ITCP, KIT) for all the fruitful discussions on reaction kinetics.

Uncontrolled Keywords:

Solid oxide electrolysis cell (SOEC); Co-electrolysis; Syngas production; Numerical modeling; Reaction kinetics

Subjects:

Chemical Engineering > Biochemical Engineering

Divisions:

Department of Chemical Engineering

Depositing User:

Team Library

Date Deposited:

18 Nov 2014 08:41

Last Modified:

04 Dec 2017 04:47