A fundamental study of boron deposition and poisoning of La0.8Sr0.2MnO3 cathode of solid oxide fuel cells under accelerated conditions

Kongfa Chen, Shu Sheng Liu, Paul Guagliardo, Matt R. Kilburn, Michihisa Koyama, San Ping Jiang

    研究成果: Contribution to journalArticle査読

    9 被引用数 (Scopus)

    抄録

    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.

    本文言語英語
    ページ(範囲)F1282-F1291
    ジャーナルJournal of the Electrochemical Society
    162
    12
    DOI
    出版ステータス出版済み - 1 1 2015

    All Science Journal Classification (ASJC) codes

    • 電子材料、光学材料、および磁性材料
    • 再生可能エネルギー、持続可能性、環境
    • 表面、皮膜および薄膜
    • 電気化学
    • 材料化学

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