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Impact of oxygen-vacancies on electrical conductivity and electrocatalytic activity of La 3-x Ca x Fe 2 GaO 9-δ (x = 0, 2; δ = 0, 1)

Solid State Sciences, ISSN: 1293-2558, Vol: 141, Page: 107208
2023
  • 3
    Citations
  • 0
    Usage
  • 5
    Captures
  • 1
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    3
    • Citation Indexes
      3
  • Captures
    5
  • Mentions
    1
    • News Mentions
      1
      • News
        1

Most Recent News

New Chemicals and Chemistry Study Results Reported from University of Louisville [Impact of Oxygen-vacancies On Electrical Conductivity and Electrocatalytic Activity of La3-xcaxfe2gao9-8 (X=0, 2; 8=0, 1)]

2023 JUL 04 (NewsRx) -- By a News Reporter-Staff News Editor at Chemicals & Chemistry Daily Daily -- A new study on Chemicals and Chemistry

Article Description

The effect of oxygen-vacancies on functional properties is demonstrated through the investigation of LaCa 2 Fe 2 GaO 8, which has a perovskite-related structure, where oxygen-vacancies appear in every third layer, converting the octahedral coordination into tetrahedral. This effect is highlighted when the properties of this material are compared to that of La 3 Fe 2 GaO 9 (LaFe 0.67 Ga 0.33 O 3 ), which has the same Fe/Ga stoichiometry but lacks oxygen-vacancies. Since the electrocatalytically active metals in ABO 3-δ catalysts are the transition metals, the role of the A-site metals (La and Ca) is to modify the structural features of the material. While the electrocatalytic performance of these systems is lower than that of the state of the art catalysts, they show an excellent example of structure-activity relationships. The vacancy-ordered LaCa 2 Fe 2 GaO 8 shows better HER electrocatalytic performance compared to La 3 Fe 2 GaO 9. The former also shows a faster HER kinetics. We have also studied the electrical conductivity in a wide range of temperatures, indicating the enhanced electrical charge-transport properties of LaCa 2 Fe 2 GaO 8. Therefore, both electrical conductivity and HER electrocatalysis are improved due to the ordered arrangement of oxygen-vacancies in LaCa 2 Fe 2 GaO 8 as compared to La 3 Fe 2 GaO 9.

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