Versatile Nature of Oxygen Vacancies in Bismuth Vanadate Bulk and (001) Surface

Franziska Simone Hegner, Daniel Forrer, José Ramón Galán-Mascarós, Núria López, Annabella Selloni

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

Bismuth vanadate (BiVO4) has emerged as one of the most promising photoanode materials for solar fuel production. Oxygen vacancies play a pivotal role in the photoelectrochemical efficiency, yet their electronic nature and contribution to n-type conductivity are still under debate. Using first-principles calculations, we show that oxygen vacancies in BiVO4 have two distinguishable geometric configurations characterized by either undercoordinated, reduced VIVO3 and BiIIO7 subunits or a VIV-O-VIV/V bridge (split vacancy), quenching the oxygen vacancy site. While both configurations have similar energies in the bulk, the (001) subsurface acts like an energetic sink that stabilizes the split oxygen vacancy by âˆ1 eV. The barrierless creation of a bridging V2O7 unit allows for partial electron delocalization throughout the near-surface region, consistent with recent experimental observations indicating that BiVO4(001) is an electron-rich surface.

Original languageEnglish (US)
Pages (from-to)6672-6678
Number of pages7
JournalJournal of Physical Chemistry Letters
Volume10
Issue number21
DOIs
StatePublished - Nov 7 2019

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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