Ni-Fe bimetallic cathodes for intermediate temperature CO2 electrolyzers using a La0.9Sr0.1Ga0.8Mg 0.2O3 electrolyte

Shijing Wang, Atsushi Inoishi, Jong Eun Hong, Young Wan Ju, Hidehisa Hagiwara, Shintaro Ida, Tatsumi Ishihara

研究成果: ジャーナルへの寄稿学術誌査読

45 被引用数 (Scopus)

抄録

A solid oxide electrolysis cell for reducing CO2 to CO was studied using a LaGaO3-based electrolyte at intermediate temperatures (973-1173 K). Various metals were examined as cathodes for CO2 reduction, and it was found that Ni shows high activity. However, coke formation was observed during the initial period. Furthermore, we found that the electrolysis current could be greatly improved by adding Fe to Ni, resulting in a current density of 1.84 A cm-2 at 1.6 V and 1073 K on a Ni-Fe (9:1) cathode. SEM observation suggests that improved cathodic activity can be explained by stabilizing Ni fine particles with the addition of Fe. Therefore, diffusion resistance can be decreased by adding Fe to Ni. The formation rate of CO is slightly lower than the consumption rate of CO2, suggesting coke formation during the initial period. However, stable CO2 electrolysis can be performed for at least 12 h, and Fe addition is effective for increasing long-term stability of electrolysis.

本文言語英語
ページ(範囲)12455-12461
ページ数7
ジャーナルJournal of Materials Chemistry A
1
40
DOI
出版ステータス出版済み - 10月 28 2013

!!!All Science Journal Classification (ASJC) codes

  • 化学 (全般)
  • 再生可能エネルギー、持続可能性、環境
  • 材料科学(全般)

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