A Fundamental Study of Boron Deposition and Poisoning of La0.8Sr0.2MnO3 Cathode of Solid Oxide Fuel Cells under Accelerated Conditions
MetadataShow full item record
Borosilicate glass and glass-ceramics are the most common sealant materials for planar solid oxide fuel cells (SOFCs). This study focuses on the fundamentals of deposition and poisoning of volatile boron species from the borosilicate glass on the electrocatalytic activity and microstructure of La0.8Sr0.2MnO3 (LSM) cathodes under accelerated SOFC operation conditions, using EIS, SEM, FIB-SEM, HRTEM, NanoSIMS, XPS and ICP-OES. The presence of boron species poisons and deteriorates the electrochemical activity and stability for the O2 reduction reaction on the LSM cathodes. Boron deposition occurs randomly on the LSM electrode surface under open circuit but is driven to the electrode/electrolyte interface region under cathodic polarization conditions, resulting in the formation of LaBO3 and Mn2O3 and the disintegration of the LSM perovskite structure. The preferential boron deposition at the interface is most likely due to the increased activity of the highly energetic lanthanum at LSM lattice sites at the three phase boundary region under cathodic polarization conditions, accelerating the reaction rate between the gaseous boron species and energetic La. This study provides a fundamental insight into the boron deposition and its interaction with SOFC cathodes.
This open access article is distributed under the Creative Commons license https://creativecommons.org/licenses/by/4.0/
Showing items related by title, author, creator and subject.
New zinc and bismuth doped glass sealants with substantially suppressed boron deposition andpoisoning for solid oxide fuel cellsChen, Kongfa; Fang, L.; Zhang, T.; Jiang, San Ping (2014)Borosilicate-based glasses are the most common sealant materials for solid oxide fuel cells (SOFCs). However, boron species vaporizing from glass sealants poison and degrade the electrocatalytic activity of cathodes of ...
Impact of volatile boron species on the microstructure and performance of nano-structured (Gd,Ce)O2 infiltrated (La,Sr)MnO3 cathodes of solid oxide fuel cellsChen, Kongfa; Ai, Na; Lievens, Caroline; Love, J.; Jiang, San Ping (2012)The impact of volatile boron species on the microstructure and performance of nano-structured (Gd,Ce)O2-infiltrated (La,Sr)MnO3 (GDC-LSM) cathodes of solid oxide fuel cells is studied for the first time. The results ...
Effects of Nb2O5 and Gd2O3 doping on boron volatility and activity between glass seals and lanthanum-containing cathodeZhang, Q.; Chen, Kongfa; Tang, D.; Zhang, T.; Jiang, San Ping (2017)In planar Solid Oxide Fuel Cells (SOFCs), the boron species volatilize from glass seals, and react with lanthanum-containing cathodes (i.e., La0.6Sr0.4Co0.2Fe0.8O3 - d, LSCF) to form LaBO3 under cathodic polarization, ...