Hydrogen-mediated polarity compensation on the (110) surface terminations of ABO3 perovskites

Victor Fung, Guoxiang Hu, Zili Wu, De En Jiang

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Polar surfaces undergo polarity compensation, which can lead to significantly different surface chemistry from their nonpolar counterparts. This process in turn can substantially alter the binding of adsorbates on the surface. Here, we find that hydrogen binds much more strongly to the polar (110) surface than the nonpolar (100) surface for a wide range of ABO3 perovskites, forming a hydroxyl layer on the O2 4- termination and a hydride layer on the ABO4+ termination of the (110) surface. The stronger adsorption on the polar surfaces can be explained by polarity compensation: hydrogen atoms can act as electron donors or acceptors to compensate for the polarity of perovskite surfaces. The relative stability of the surface terminations is further compared under different gas environments and several perovskites have been found to form stable surface hydride layers under oxygen-poor conditions. These results demonstrate the feasibility of creating stable surface hydrides on perovskites by polarity compensation which might lead to new hydrogenation catalysts based on ABO3 perovskites.

Original languageEnglish
Article number174706
JournalJournal of Chemical Physics
Volume159
Issue number17
DOIs
StatePublished - Nov 7 2023

Fingerprint

Dive into the research topics of 'Hydrogen-mediated polarity compensation on the (110) surface terminations of ABO3 perovskites'. Together they form a unique fingerprint.

Cite this