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

Research output: Contribution to journalArticle

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Abstract

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.

Original languageEnglish
Pages (from-to)12455-12461
Number of pages7
JournalJournal of Materials Chemistry A
Volume1
Issue number40
DOIs
Publication statusPublished - Oct 28 2013

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Electrolysis
Electrolytes
Cathodes
Carbon Monoxide
Coke
Regenerative fuel cells
Temperature
Current density
Metals
Scanning electron microscopy

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Cite this

Ni-Fe bimetallic cathodes for intermediate temperature CO2 electrolyzers using a La0.9Sr0.1Ga0.8Mg 0.2O3 electrolyte. / Wang, Shijing; Inoishi, Atsushi; Hong, Jong Eun; Ju, Young Wan; Hagiwara, Hidehisa; Ida, Shintaro; Ishihara, Tatsumi.

In: Journal of Materials Chemistry A, Vol. 1, No. 40, 28.10.2013, p. 12455-12461.

Research output: Contribution to journalArticle

Wang, Shijing ; Inoishi, Atsushi ; Hong, Jong Eun ; Ju, Young Wan ; Hagiwara, Hidehisa ; Ida, Shintaro ; Ishihara, Tatsumi. / Ni-Fe bimetallic cathodes for intermediate temperature CO2 electrolyzers using a La0.9Sr0.1Ga0.8Mg 0.2O3 electrolyte. In: Journal of Materials Chemistry A. 2013 ; Vol. 1, No. 40. pp. 12455-12461.
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AU - Wang, Shijing

AU - Inoishi, Atsushi

AU - Hong, Jong Eun

AU - Ju, Young Wan

AU - Hagiwara, Hidehisa

AU - Ida, Shintaro

AU - Ishihara, Tatsumi

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