Mayenite Electrides and Their Doped Forms for Oxygen Reduction Reaction in Solid Oxide Fuel Cells

Navaratnarajah Kuganathan, Ruslan Vovk, Alexander Chroneos

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    Abstract

    The oxygen reduction reaction is an important reaction at the cathode in solid oxide fuel cells. Materials that exhibit high chemical and mechanical stability, high ionic and electronic conductivity, and are non‐toxic are of great interest as cathodes for the reduction of oxygen. Here, we use density functional theory simulations to examine the efficacy of 12CaO∙7Al2O3 and 12SrO∙7Al2O3 electrides and their doped forms for the conversion of O2 gas to form O2− in their nanocages via encapsulation. Calculations show that encapsulation is exoergic in the un‐doped electrides, and the formation of O2− is confirmed by the charge analysis. A stronger encapsulation is noted for C12A7 electride than the S12A7 electride. The C12A7 electride doped with B or Ga also exhibits exoergic encapsulation, but its encapsulation energy is slightly lower than that calculated for the un‐doped C12A7 electride. There is an enhancement in the encapsulation for the S12A7 electride doped with B compared to its un‐doped form. Doping of Ga in S12A7 electride exhibits only a very small change in the encapsulation with respect to its un‐doped form. The present results can be of interest in the design of cathode material for solid oxide fuel cells.
    Original languageEnglish
    Article number4978
    Number of pages14
    JournalEnergies
    Volume13
    Issue number18
    DOIs
    Publication statusPublished - 22 Sep 2020

    Bibliographical note

    © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

    Funder

    European Union’s H2020 Program under Grant Agreement no. 824072–HARVESTORE.

    Keywords

    • C12A7
    • S12A7
    • fuel cell
    • reduction
    • DFT
    • electride
    • Reduction
    • Electride
    • Fuel cell

    ASJC Scopus subject areas

    • Control and Optimization
    • Energy (miscellaneous)
    • Energy Engineering and Power Technology
    • Electrical and Electronic Engineering
    • Renewable Energy, Sustainability and the Environment

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