Boron deposition and poisoning of La0.8Sr0.2MnO3 oxygen electrodes of solid oxide electrolysis cells under accelerated operation conditions

Kongfa Chen, Junji Hyodo, Na Ai, Tatsumi Ishihara, San Ping Jiang

研究成果: ジャーナルへの寄稿学術誌査読

23 被引用数 (Scopus)

抄録

The effect of boron species from borosilicate glass sealant on the electrocatalytic activity and microstructure of La0.8Sr0.2MnO3 (LSM) oxygen electrodes is studied for the first time under accelerated solid oxide electrolysis cell (SOEC) operation conditions at 800 °C. The presence of volatile boron species has remarkable detrimental effect on the electrochemical activity of LSM oxygen electrode for the O2 evolution reaction (OER). After polarization at 200 mA cm-2 for 2 h, the electrode polarization and ohmic resistances increase rapidly from ∼40 and 1.2 cm2 to 614 and 33 cm2, respectively. Under the anodic polarization conditions, there is an accelerated Sr segregation and boron deposition preferentially occurs at the electrode/electrolyte interface, forming lanthanum borates and manganese oxide. Boron deposition and reaction is driven to the interface region due to the increased activity and energetics of lanthanum at LSM lattice sites at the electrode/electrolyte interface under anodic polarization conditions, accelerating the disintegration and delamination of the LSM electrode. The results indicate the potential detrimental effect of volatile boron on the electrochemical activity and stability of LSM oxygen electrodes of solid oxide electrolyzers.

本文言語英語
ページ(範囲)1419-1431
ページ数13
ジャーナルInternational Journal of Hydrogen Energy
41
3
DOI
出版ステータス出版済み - 1月 21 2016

All Science Journal Classification (ASJC) codes

  • 再生可能エネルギー、持続可能性、環境
  • 燃料技術
  • 凝縮系物理学
  • エネルギー工学および電力技術

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