A high performing perovskite cathode with in situ exsolved Co nanoparticles for H2O and CO2 solid oxide electrolysis cell

Juanjuan Gan, Nianjun Hou, Tongtong Yao, Lijun Fan, Tian Gan, Zhiyong Huang, Yicheng Zhao*, Yongdan Li

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

La0.5Ba0.5Mn1-xCoxO3-δ (x < 0.4) with a perovskite structure is studied as a cathode material for solid oxide electrolysis cells. The exsolution of metallic Co from the perovskite in a reducing atmosphere is in situ investigated. Co improves the electrical conductivity of La0.5Ba0.5MnO3-δ in a reducing atmosphere, and facilitates the oxygen exchange reaction on the cathode surface. The cathode with in situ exsolved Co nanoparticles shows a high activity for both H2O and CO2 electrolysis. At 1.3 V, a single cell supported by a La0.8Sr0.2Ga0.8Mg0.2O3-δ electrolyte layer achieves H2O electrolysis current densities of 0.46 and 1.01 A cm-2 at 700 and 800 °C, respectively. A high CO2 electrolysis current density of 0.88 A cm−2 is also obtained with the same cell at 1.2 V and 850 °C with a Faradaic efficiency exceeding 90 %. The cathode exhibits a high stability for H2O and CO2 electrolysis. The co-electrolysis of H2O and CO2 with the cathode is also studied.

Original languageEnglish
JournalCatalysis Today
DOIs
Publication statusE-pub ahead of print - 28 Jul 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • Cathode
  • Co doping
  • LaBaMnO
  • Solid oxide electrolysis cell

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