Thermally stable N 2-Intercalated WO 3 photoanodes for water oxidation

Qixi Mi, Yuan Ping, Yan Li, Bingfei Cao, Bruce S. Brunschwig, Peter G. Khalifah, Giulia A. Galli, Harry B. Gray, Nathan S. Lewis

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Abstract

We describe stable intercalation compounds of the composition xN 2̇WO 3 (x = 0.034-0.039), formed by trapping N 2 in WO 3. The incorporation of N 2 significantly reduced the absorption threshold of WO 3; notably, 0.039N 2̇WO 3 anodes exhibited photocurrent under illumination at wavelengths ≥640 nm with a faradaic efficiency for O 2 evolution in 1.0 M HClO 4(aq) of nearly unity. Spectroscopic and computational results indicated that deformation of the WO 3 host lattice, as well as weak electronic interactions between trapped N 2 and the WO 3 matrix, contributed to the observed red shift in optical absorption. Noble-gas-intercalated WO 3 materials similar to xN 2̇WO 3 are predicted to function as photoanodes that are responsive to visible light.

Original languageEnglish
Pages (from-to)18318-18324
Number of pages7
JournalJournal of the American Chemical Society
Volume134
Issue number44
DOIs
Publication statusPublished - Nov 7 2012

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ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Mi, Q., Ping, Y., Li, Y., Cao, B., Brunschwig, B. S., Khalifah, P. G., Galli, G. A., Gray, H. B., & Lewis, N. S. (2012). Thermally stable N 2-Intercalated WO 3 photoanodes for water oxidation. Journal of the American Chemical Society, 134(44), 18318-18324. https://doi.org/10.1021/ja3067622