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First-Principles Modeling of Oxygen Adsorption on Ag-Doped LaMnO3 (001) Surface

  • A. U. Abuova
  • Yu. A. MastrikovEmail author
  • E. A. Kotomin
  • S. N. Piskunov
  • T. M. Inerbaev
  • A. T. Akilbekov
Article
  • 7 Downloads

Abstract

The density functional theory (DFT) method has been used to calculate oxygen adsorption on the Ag-doped MnO2- and LaO-terminated (001) LaMnO3 surfaces. The catalytic effect of Ag doping is revealed by comparison of the adsorption energies, electron charge redistribution, and interatomic distances for the doped and undoped surfaces. Adsorption of Ag on the MnO2-terminated surface increases the adsorption energy for both atomic and molecular oxygen. This increases the oxygen surface concentrations and could improve the cathode efficiency of fuel cells. The opposite effect takes place at the LaO-terminated surface. Due to the large adsorption energies, adsorbed oxygen atoms are immobile and the oxygen reduction reaction rate is controlled by the concentration and mobility of oxygen vacancies.

Keywords

Solid oxide fuel cells LaMnO3 oxygen adsorption Ag catalyst ab initio calculations 

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Notes

Acknowledgments

This study was partly financed by the State Education Development Agency of the Republic of Latvia via the Latvian State Scholarship (A.A.) and Latvia-Ukraine Project (Grant LV-UA/2018/2 to E.K.). The work of T.I. is performed under the state assignment of IGM SB RAS. Also, this research was partly supported by the Ministry of Education and Science of the Republic of Kazakhstan in the framework of the scientific and technology Program BR05236795 ‘‘Development of Hydrogen Energy Technologies in the Republic of Kazakhstan’’. The authors thank M. Sokolov for technical assistance and valuable suggestions.

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  1. 1.L.N. Gumilyov, Eurasian National UniversityAstanaKazakhstan
  2. 2.Institute of Solid State PhysicsUniversity of LatviaRigaLatvia
  3. 3.Sobolev Institute of Geology and Mineralogy SB RASNovosibirskRussia

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