Energetics of semiconductor electrode/solution interfaces

EQCM evidence for charge-compensating cation adsorption and intercalation during accumulation layer formation in the titanium dioxide/acetonitrile system

L. Andrew Lyon, Joseph T Hupp

Research output: Contribution to journalArticle

100 Citations (Scopus)

Abstract

Combined reflectance, electrochemical quartz crystal microbalance, and conventional voltammetric measurements on high-area titanium dioxide electrodes in dry, electrolyte-containing solutions of acetonitrile show that electron accumulation layer formation is coupled directly to intercalation (e.g., Li+ or Na+) or to reversible adsorption (tetrabutylammonium ion) of charge compensating cations. Difficulty in achieving intercalation with these ions appears to account for the extreme negative shift of the flatband potential in acetonitrile, in comparison to aqueous solutions. More generally, the charge compensation based adsorption/intercalation phenomenon appears to play a key role in defining the conduction band edge energetics of titanium dioxide (and presumably other metal oxides) in solution environments.

Original languageEnglish
Pages (from-to)15718-15720
Number of pages3
JournalJournal of Physical Chemistry
Volume99
Issue number43
Publication statusPublished - 1995

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Intercalation
Acetonitrile
titanium oxides
intercalation
Titanium dioxide
acetonitrile
Cations
Positive ions
Semiconductor materials
Adsorption
cations
Electrodes
adsorption
electrodes
Ions
Quartz crystal microbalances
quartz crystals
Conduction bands
microbalances
Oxides

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

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title = "Energetics of semiconductor electrode/solution interfaces: EQCM evidence for charge-compensating cation adsorption and intercalation during accumulation layer formation in the titanium dioxide/acetonitrile system",
abstract = "Combined reflectance, electrochemical quartz crystal microbalance, and conventional voltammetric measurements on high-area titanium dioxide electrodes in dry, electrolyte-containing solutions of acetonitrile show that electron accumulation layer formation is coupled directly to intercalation (e.g., Li+ or Na+) or to reversible adsorption (tetrabutylammonium ion) of charge compensating cations. Difficulty in achieving intercalation with these ions appears to account for the extreme negative shift of the flatband potential in acetonitrile, in comparison to aqueous solutions. More generally, the charge compensation based adsorption/intercalation phenomenon appears to play a key role in defining the conduction band edge energetics of titanium dioxide (and presumably other metal oxides) in solution environments.",
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year = "1995",
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T1 - Energetics of semiconductor electrode/solution interfaces

T2 - EQCM evidence for charge-compensating cation adsorption and intercalation during accumulation layer formation in the titanium dioxide/acetonitrile system

AU - Lyon, L. Andrew

AU - Hupp, Joseph T

PY - 1995

Y1 - 1995

N2 - Combined reflectance, electrochemical quartz crystal microbalance, and conventional voltammetric measurements on high-area titanium dioxide electrodes in dry, electrolyte-containing solutions of acetonitrile show that electron accumulation layer formation is coupled directly to intercalation (e.g., Li+ or Na+) or to reversible adsorption (tetrabutylammonium ion) of charge compensating cations. Difficulty in achieving intercalation with these ions appears to account for the extreme negative shift of the flatband potential in acetonitrile, in comparison to aqueous solutions. More generally, the charge compensation based adsorption/intercalation phenomenon appears to play a key role in defining the conduction band edge energetics of titanium dioxide (and presumably other metal oxides) in solution environments.

AB - Combined reflectance, electrochemical quartz crystal microbalance, and conventional voltammetric measurements on high-area titanium dioxide electrodes in dry, electrolyte-containing solutions of acetonitrile show that electron accumulation layer formation is coupled directly to intercalation (e.g., Li+ or Na+) or to reversible adsorption (tetrabutylammonium ion) of charge compensating cations. Difficulty in achieving intercalation with these ions appears to account for the extreme negative shift of the flatband potential in acetonitrile, in comparison to aqueous solutions. More generally, the charge compensation based adsorption/intercalation phenomenon appears to play a key role in defining the conduction band edge energetics of titanium dioxide (and presumably other metal oxides) in solution environments.

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