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High Temperature Water Electrolysis Using Metal Supported Solid Oxide Electrolyzer Cells (SOEC)

Schiller, Günter and Ansar, Asif Syed and Patz, Olaf (2010) High Temperature Water Electrolysis Using Metal Supported Solid Oxide Electrolyzer Cells (SOEC). CIMTEC 2010 - 5th Forum on New Materials, 13.-18. Juni 2010, Montecatini Terme, Italien.

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Abstract

Metal supported cells as developed at DLR for use as solid oxide fuel cells by applying plasma deposition technologies were investigated in operation of high temperature steam electrolysis. The cells consisted of a porous ferritic steel support, a diffusion barrier layer, a Ni/YSZ fuel electrode, a YSZ electrolyte and a LSCF oxygen electrode. During fuel cell and electrolysis operation the cells were electrochemically characterized by means of i-V characteristics and electrochemical impedance spectroscopy measurements including a long-term test over 2000 hours. The results of electrochemical performance and long-term durability tests of both single cells and single repeating units (cell including metallic interconnect) are reported. During electrolysis operation at an operating temperature of 850 °C a cell voltage of 1.28 V was achieved at a current density of -1.0 Acm-2; at 800 °C the cell voltage was 1.40 V at the same operating conditions. The impedance spectra revealed a significantly enhanced polarization resistance during electrolysis operation compared to fuel cell operation which was mainly attributed to the hydrogen electrode. During a long-term test run of a single cell over 2000 hours a degradation rate of 3.2% per 1000 hours was observed for operation with steam content of 43% at 800 °C and a current density of -0.3 Acm-2. Testing of a single repeating unit proved that a good contacting of cell and metallic interconnect is of major importance to achieve good performance. A test run over nearly 1000 hours showed a remarkably low degradation rate.

Item URL in elib:https://elib.dlr.de/64620/
Document Type:Conference or Workshop Item (Speech)
Title:High Temperature Water Electrolysis Using Metal Supported Solid Oxide Electrolyzer Cells (SOEC)
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schiller, GünterDLR-TTUNSPECIFIED
Ansar, Asif SyedDLR-TTUNSPECIFIED
Patz, OlafUNSPECIFIEDUNSPECIFIED
Date:June 2010
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:High temperature steam electrolysis, metal supported cell, electrochemical performance, degradation behaviour, single cell, single repeating unit
Event Title:CIMTEC 2010 - 5th Forum on New Materials
Event Location:Montecatini Terme, Italien
Event Type:international Conference
Event Dates:13.-18. Juni 2010
Organizer:Pietro Vincenzini
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion (old)
HGF - Program Themes:E BZ - Fuel cells (old)
DLR - Research area:Energy
DLR - Program:E BZ - Fuel cells
DLR - Research theme (Project):E - Hochtemperatur-Brennstoffzellen (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Schiller, Dr.rer.nat. Günter
Deposited On:21 Jul 2010 08:52
Last Modified:31 Jul 2019 19:28

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