Mechanistic insights into chemical and photochemical transformations of bismuth vanadate photoanodes

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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Author(s)

  • Francesca M. Toma
  • Jason K. Cooper
  • Viktoria Kunzelmann
  • Matthew T. McDowell
  • Jie Yu
  • David M. Larson
  • Nicholas J. Borys
  • Christine Abelyan
  • Jeffrey W. Beeman
  • Jinhui Yang
  • Le Chen
  • Matthew R. Shaner
  • Joshua Spurgeon
  • Frances A. Houle
  • Kristin A. Persson
  • Ian D. Sharp

Detail(s)

Original languageEnglish
Article number12012
Journal / PublicationNature Communications
Volume7
Publication statusPublished - 5 Jul 2016

Link(s)

Abstract

Artificial photosynthesis relies on the availability of semiconductors that are chemically stable and can efficiently capture solar energy. Although metal oxide semiconductors have been investigated for their promise to resist oxidative attack, materials in this class can suffer from chemical and photochemical instability. Here we present a methodology for evaluating corrosion mechanisms and apply it to bismuth vanadate, a state-of-the-art photoanode. Analysis of changing morphology and composition under solar water splitting conditions reveals chemical instabilities that are not predicted from thermodynamic considerations of stable solid oxide phases, as represented by the Pourbaix diagram for the system. Computational modelling indicates that photoexcited charge carriers accumulated at the surface destabilize the lattice, and that self-passivation by formation of a chemically stable surface phase is kinetically hindered. Although chemical stability of metal oxides cannot be assumed, insight into corrosion mechanisms aids development of protection strategies and discovery of semiconductors with improved stability.

Research Area(s)

Citation Format(s)

Mechanistic insights into chemical and photochemical transformations of bismuth vanadate photoanodes. / Toma, Francesca M.; Cooper, Jason K.; Kunzelmann, Viktoria; McDowell, Matthew T.; Yu, Jie; Larson, David M.; Borys, Nicholas J.; Abelyan, Christine; Beeman, Jeffrey W.; Yu, Kin Man; Yang, Jinhui; Chen, Le; Shaner, Matthew R.; Spurgeon, Joshua; Houle, Frances A.; Persson, Kristin A.; Sharp, Ian D.

In: Nature Communications, Vol. 7, 12012, 05.07.2016.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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