Niobium oxide nanoscrolls as building blocks for dye-sensitized hydrogen production from water under visible light irradiation

Kazuhiko Maeda, Miharu Eguchi, W. Justin Youngblood, Thomas E. Mallouk

Research output: Contribution to journalArticle

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Abstract

Potassium hexaniobate nanoscrolls (NS-K4Nb6O 17) formed by exfoliation of lamellar K4Nb 6O17 were studied as building blocks for visible-light-driven H2 production (λ > 420 nm) from water using tris(2,2′-bipyridyl)ruthenium(II) chloride (Ru(bpy)3 2+) as a sensitizer and ethylenediaminetetraacetic acid (EDTA) as an electron donor. The surface of NS-K4Nb6O17 is negatively charged at pH 3-11, enabling cationic Ru(bpy)3 2+ molecules to be efficiently adsorbed onto the surface, allowing for rapid excited-state electron and subsequent H2 evolution without any chemical bond linkage between the sensitizer and the oxide surface. The rate of visible light H2 production in the nanoscroll-based system is 10 times higher than that of similarly sensitized K4Nb6O 17. The difference can be primarily attributed to the strong adsorption of Ru(bpy)32+ in the case of the nanoscrolls. The maximum photocatalytic reactivity is found over a narrow range of pH and Pt-loading. This study highlights the utility of single-crystalline oxide nanosheets as components of photosystems for visible-light-driven H2 production from water.

Original languageEnglish (US)
Pages (from-to)6770-6778
Number of pages9
JournalChemistry of Materials
Volume20
Issue number21
DOIs
Publication statusPublished - Nov 11 2008

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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