Visible Light Photolysis of Hydrogen Iodide Using Sensitized Layered Semiconductor Particles

Yeong Il Kim, Samer Salim, Munir J. Huq, Thomas E. Mallouk

Research output: Contribution to journalArticlepeer-review

187 Scopus citations

Abstract

Surface sensitization of internally platinized layered oxide semiconductors K4−xHxNb6O17·nH2O (x ≈ 2.5), H2Ti3O7, and HTiNb05 by RuL32+ (L = 4,4′-dicarboxy-2,2′-bipyridine) yields photocatalysts for the production of H2 and I3 in aqueous iodide solutions. Flash photolysis experiments show that, at pH 3.0, excited-state RuL32+ injects an electron into K4−xHxNb6O17·nH2O and is rapidly re-reduced by I. Steady-state photolysis at 450 nm in 50 mM aqueous KI (pH 3.0) yields H2 and I3 in stoichiometric amounts, with an initial quantum yield of 0.3%. While H2 and I3, once formed, do not recombine at an observable rate, the rate of hydrogen evolution decreases as the concentration of 13 increases in the solution.

Original languageEnglish (US)
Pages (from-to)9561-9563
Number of pages3
JournalJournal of the American Chemical Society
Volume113
Issue number25
DOIs
StatePublished - Dec 1 1991

All Science Journal Classification (ASJC) codes

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

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