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Improving atmospheric plasma sprayed electrolyte layers of solid oxide fuel cells by use of a powder separator

Liu, Taikai and Arnold, Johannes (2016) Improving atmospheric plasma sprayed electrolyte layers of solid oxide fuel cells by use of a powder separator. International Thermal Spray Conference & Exhibition 2016, 9.-12. Mai 2016, Shanghai, China.

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Abstract

In order to increase the performance of solid oxide fuel cells (SOFCs) the property of the electrolyte deposited by atmospheric plasma spraying (APS) has to be optimized concerning surface roughness and density. In this work, a dense YSZ coating with homogenous structure was realized on a NiO-YSZ anode which was supported by a porous metal substrate made of Crofer 22 H. A powder separator, which was able to diminish fluctuations of the in-flight particle stream, was used the first time to stabilize the APS process. During powder feeding a fully yttria-stabilized zirconia powder was on-line separated into two parts: a fraction of fine particles which were fed directly to the plasma, and a fraction of coarse particles which were collected and reused. The resulting coating exhibited a high homogeneity both in cross section and on surface. Validated by SEM images, the optimized coating did not possess any cracks and the porosity ratio was close to that found by vacuum plasma spraying (VPS) when two separators were employed. The gas leak rate shows an obvious increase of electrolyte performance compared to results without any powder separator.

Item URL in elib:https://elib.dlr.de/110531/
Document Type:Conference or Workshop Item (Speech)
Title:Improving atmospheric plasma sprayed electrolyte layers of solid oxide fuel cells by use of a powder separator
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Liu, TaikaiTaikai.Liu (at) dlr.deUNSPECIFIED
Arnold, Johannesjohannes.arnold (at) dlr.deUNSPECIFIED
Date:11 May 2016
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Performance, SOFC, electrolyte, atmospheric plasma spraying, APS, YSZ coating, NiO-YSZ anode, metal substrate, Crofer 22 H, powder separator, fine and coarse particles.
Event Title:International Thermal Spray Conference & Exhibition 2016
Event Location:Shanghai, China
Event Type:international Conference
Event Dates:9.-12. Mai 2016
Organizer:DVS – German Welding Society
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Fuel cells
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Electrochemical Processes (Fuel Cells) (old), E - Electrochemical Processes (Electrolysis) (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Arnold, Dr.-Ing. Johannes
Deposited On:12 Jan 2017 07:32
Last Modified:12 Jan 2017 07:32

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