Electrochemical quartz crystal microbalance studies of electron addition at nanocrystalline tin oxide/water and zinc oxide/water interfaces: Evidence for band-edge-determining proton uptake

Buford I. Lemon, Joseph T Hupp

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

Electrochemical quartz crystal microbalance (EQCM) measurements provide compelling evidence for charge-compensating cation uptake by nanocrystalline SnO2 and ZnO electrodes during electron addition. Comparative light water/heavy water measurements establish that the adsorbed or intercalated ions are protons or deuterons. Additional studies as a function of pH implicate water, rather than hydronium ions, as the proton source. The new results, when combined with previous results for titanium dioxide in nonaqueous electrolytes, suggest that charge-compensating cation intercalation is a general mode of reactivity for metal oxide semiconductors. Finally, the new observations raise significant fundamental questions concerning (1) chemical control of band energetics, (2) possible band-edge-unpinning phenomena, and (3) relationships between band edge energies and driving forces for isolated electron transfer reactions.

Original languageEnglish
Pages (from-to)2426-2429
Number of pages4
JournalJournal of Physical Chemistry B
Volume101
Issue number14
Publication statusPublished - Apr 3 1997

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Zinc Oxide
Quartz crystal microbalances
Zinc oxide
quartz crystals
Tin oxides
microbalances
zinc oxides
tin oxides
Cations
Protons
Positive ions
Deuterium Oxide
Heavy water
protons
oxides
Electrons
Water
Deuterium
Ions
Intercalation

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

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abstract = "Electrochemical quartz crystal microbalance (EQCM) measurements provide compelling evidence for charge-compensating cation uptake by nanocrystalline SnO2 and ZnO electrodes during electron addition. Comparative light water/heavy water measurements establish that the adsorbed or intercalated ions are protons or deuterons. Additional studies as a function of pH implicate water, rather than hydronium ions, as the proton source. The new results, when combined with previous results for titanium dioxide in nonaqueous electrolytes, suggest that charge-compensating cation intercalation is a general mode of reactivity for metal oxide semiconductors. Finally, the new observations raise significant fundamental questions concerning (1) chemical control of band energetics, (2) possible band-edge-unpinning phenomena, and (3) relationships between band edge energies and driving forces for isolated electron transfer reactions.",
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AB - Electrochemical quartz crystal microbalance (EQCM) measurements provide compelling evidence for charge-compensating cation uptake by nanocrystalline SnO2 and ZnO electrodes during electron addition. Comparative light water/heavy water measurements establish that the adsorbed or intercalated ions are protons or deuterons. Additional studies as a function of pH implicate water, rather than hydronium ions, as the proton source. The new results, when combined with previous results for titanium dioxide in nonaqueous electrolytes, suggest that charge-compensating cation intercalation is a general mode of reactivity for metal oxide semiconductors. Finally, the new observations raise significant fundamental questions concerning (1) chemical control of band energetics, (2) possible band-edge-unpinning phenomena, and (3) relationships between band edge energies and driving forces for isolated electron transfer reactions.

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