Stability of double perovskite cathodes under high humidity for solid oxide fuel cells

Liu, Yuchen

Title:

Stability of double perovskite cathodes under high humidity for solid oxide fuel cells

dc.contributor.advisor	Liu, Meilin
dc.contributor.advisor	Singh, Preet M.\|Alamgir, Faisal M.
dc.contributor.author	Liu, Yuchen
dc.contributor.department	Materials Science and Engineering
dc.date.accessioned	2020-05-20T16:58:00Z
dc.date.available	2020-05-20T16:58:00Z
dc.date.created	2019-05
dc.date.issued	2019-05-06
dc.date.submitted	May 2019
dc.date.updated	2020-05-20T16:58:00Z
dc.description.abstract	Solid Oxide Fuel Cells (SOFCs) can directly convert a wide variety of fuels to electricity efficiently. They can also be run in reverse as Solid Oxide Electrolysis Cells (SOECs) to produce hydrogen (and carbon-containing fuels) from electrolysis of water (and carbon dioxide). However, the kinetics of oxygen reduction reaction (ORR) on the cathode is often hindered by various contaminants, which may react with the cathode to form insulating phases and degrade fuel cell performance. The stability and performance of the cathode in moisture is critical to the cell performance as SOFCs and SOECs. Several state-of-the-art cathode materials are investigated in a high moisture environment to uncover their performance and degradation mechanism. First, powders of electrode materials were analyzed for any degradation before and after long-term moisture exposure using XRD to probe the bulk and Raman Spectroscopy to probe the surface. SEM was also used to characterize any morphological changes during the exposure. Second, electrochemical impedance spectroscopy (EIS) was used to monitor the long-term performance of symmetric cells under various conditions. Finally, current-voltage relationships of symmetric cells were acquired under typical operating conditions for SOFCs and SOECs to determine the polarization resistance, stability and durability of the cathode materials.
dc.description.degree	M.S.
dc.format.mimetype	application/pdf
dc.identifier.uri	http://hdl.handle.net/1853/62707
dc.language.iso	en_US
dc.publisher	Georgia Institute of Technology
dc.subject	Solid oxide fuel cells
dc.subject	Solid oxide electrolysis cells
dc.subject	Water vapor
dc.subject	Electrochemical impedance spectroscopy
dc.subject	Cathode
dc.subject	Double perovskite
dc.title	Stability of double perovskite cathodes under high humidity for solid oxide fuel cells
dc.type	Text
dc.type.genre	Thesis
dspace.entity.type	Publication
local.contributor.advisor	Liu, Meilin
local.contributor.corporatename	School of Materials Science and Engineering
local.contributor.corporatename	College of Engineering
relation.isAdvisorOfPublication	30dd1bbc-edf1-406a-9183-d985863cbab3
relation.isOrgUnitOfPublication	21b5a45b-0b8a-4b69-a36b-6556f8426a35
relation.isOrgUnitOfPublication	7c022d60-21d5-497c-b552-95e489a06569
thesis.degree.level	Masters