Photochemical charge transfer and hydrogen evolution mediated by oxide semiconductor particles in zeolite-based molecular assemblies

Yeong Il Kim, Steven W. Keller, Jonathan S. Krueger, Edward H. Yonemoto, Geoffrey B. Saupe, Thomas E. Mallouk

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Abstract

Two integrated systems for light-induced vectorial electron transfer are described. Both utilize photosensitized semiconductor particles grown in linear channel zeolites as components of the electron transfer chain. One system consists of internally platinized zeolites L and mordenite containing TiO 2 particles and methylviologen ions, with a size-excluded photosensitizer, tris(2,2′-bipyridyl-4,4′-dicarboxylate)ruthenium (RuL 3 2+ ), adsorbed on the external surface of the zeolite/TiO 2 composite. In the other system, Nb 2 O 5 replaces TiO 2 . The kinetics of photochemical electron transfer reactions and charge separation were studied by diffuse reflectance flash photolysis. Despite very efficient initial charge separation, the TiO 2 system does not generate hydrogen photochemically in the presence of an electrochemically reversible, anionic electron donor, methoxyaniline N,N′-bis(ethyl sulfonate). Only the Nb 2 O 5 -containing composites evolved hydrogen photochemically under these conditions. These results are interpreted in terms of semiconductor band energetics and the irreversibility of electron transfer from Nb 2 O 5 to intrazeolitic platinum particles.

Original languageEnglish (US)
Pages (from-to)2491-2500
Number of pages10
JournalJournal of Physical Chemistry B
Volume101
Issue number14
StatePublished - Apr 3 1997

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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    Kim, Y. I., Keller, S. W., Krueger, J. S., Yonemoto, E. H., Saupe, G. B., & Mallouk, T. E. (1997). Photochemical charge transfer and hydrogen evolution mediated by oxide semiconductor particles in zeolite-based molecular assemblies. Journal of Physical Chemistry B, 101(14), 2491-2500.