TY - JOUR
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 - 1995/1/1
Y1 - 1995/1/1
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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U2 - 10.1021/j100043a005
DO - 10.1021/j100043a005
M3 - Article
AN - SCOPUS:0000079390
VL - 99
SP - 15718
EP - 15720
JO - Journal of Physical Chemistry
JF - Journal of Physical Chemistry
SN - 0022-3654
IS - 43
ER -