Tailoring kinetics of Cr-chemisorption over La0.6Sr0.4Fe0.8Co0.2O3 cathode material through its porosity variation

Meigeng Gao, Elena Yu Konysheva, Jun Yang

Research output: Journal PublicationArticlepeer-review

Abstract

The La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) ceramics with the porosity of 20% (LSCF-20) and 50% (LSCF-50) were fabricated through temperature variation. Kinetics of the Cr-adsorption has been studied at 700 °C over 345 h under air. Different dominant mechanisms of Cr chemisorption over the ceramics with different porosities were identified. The Cr–substitution into the LSCF perovskite grains will dominate in the denser LSCF-20 ceramics, whereas the growth of SrCrO4 crystals over the LSCF perovskite phase will occur preferably in the more porous LSCF-50 ceramics. The Cr penetrates into a more porous LSCF-50 ceramics up to 12–17 μm and the total Cr amount adsorbed after 345 h over the LSCF-50 ceramics is larger by about 10 times than over the denser LSCF-20 ceramics. The revealed remarkable differences could be associated with the increase in the surface area and with a higher volume of macro- and mesoporosity.

Original languageEnglish
JournalInternational Journal of Hydrogen Energy
DOIs
Publication statusAccepted/In press - 2022

Keywords

  • Chromium incorporation into the perovskite structure
  • Cr chemisorption
  • Porous LSCF
  • SOFC
  • SrCrO

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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