https://doi.org/10.1140/epjb/s10051-025-00978-3
Regular Article - Solid State and Materials
Impact of hematite surface magnetic configurations and strain on O2 adsorption
1
ICTP-East African Institute for Fundamental Research (EAIFR), University of Rwanda, Kigali, Rwanda
2
The Deanery, College of Science, Engineering and Technology (CSET), University of South Africa (UNISA), 28 Pioneer Ave, Florida Park, 1709, Johannesburg, South Africa
3
Department of Physics, University of Ibadan, Ibadan, Nigeria
4
The Abdus Salam International Centre for Theoretical Physics, 34151, Trieste, Italy
Received:
15
March
2025
Accepted:
30
May
2025
Published online:
11
June
2025
Iron oxides are abundant and inexpensive materials with promising potential for catalysis. However, the influence of their intrinsic magnetic properties on their catalytic activity is not well established. This study investigates the correlation of magnetic order to the catalytic activity of the α-Fe2O3 (0001) surface using the adsorption of molecular oxygen as a descriptor. Our findings reveal that the magnetic order strongly influences the O2 adsorption, yielding lower binding energies for the antiferromagnetic (AFM) configurations and making them more inert than the ferromagnetic (FM) one. We find the origin of the higher reactivity of the FM configuration in its broader d-band and its delocalization of the charge, together with the larger surface magnetization, relative to the AFM ones. Adsorption on the FM surface results in a markedly higher charge transfer to O2 than on the AFM surfaces. These results highlight the critical role of magnetic configurations in governing the adsorption and catalytic properties of α-Fe2O3 (0001) surfaces, providing valuable insights for designing and optimizing more efficient magnetic catalysts. We also investigated the adsorption energy as a function of biaxial strain, finding that compressive strain strengthens adsorption on both FM and AFM surfaces, with the FM surface gaining additional stability relative to the AFM surface under compressive strain.
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Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
