Enhanced O

Silvera Scaccia, Stefano Frangini, Serena Dellepiane

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

The solubilization of O2reactant gas in mixtures of molten alkali carbonate, which are to be used as electrolytes in the Molten Carbonate Fuel Cells, has been investigated as a function of melt composition, temperature and O2-CO2gas atmosphere. The baseline content of dissolved oxygen in (52 + 48) mol% Li2CO3+ Na2CO3and (62 + 38) mol% Li2CO3+ K2CO3is markedly increased by the additions of 0.5 mol% rare-earth (RE = La and Gd) oxides to the melts. By a curve-fitting method the mechanisms through which oxygen dissolves into the melts are predicted. At 923 K the oxygen dissolution mechanism passes from a superoxide path, which is dominant in the additive-free melts, to either a prevalent peroxide path in the Li-Na melt or a mixture of superoxide and peroxide ions in the Li-K electrolyte. At lower temperature (873 K) RE oxide additives are effective in modifying the oxygen dissolution mechanism only for the Li-Na melts. © 2007 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)107 - 112
Number of pages6
JournalJournal of Molecular Liquids
Volume138
Issue number1-3
DOIs
Publication statusPublished - 15 Feb 2008

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All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Atomic and Molecular Physics, and Optics

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