Y. Shingaya et al., INFRARED SPECTROSCOPIC STUDY OF ELECTRIC DOUBLE-LAYERS ON PT(111) UNDER ELECTRODE-REACTIONS IN A SULFURIC-ACID-SOLUTION, Journal of electroanalytical chemistry [1992], 409(1-2), 1996, pp. 103-108
The electric double layer structures on a Pt(111) electrode in H2SO4 s
olution were studied by in-situ and ex-situ infrared spectroscopies, a
nd the structures were successfully created by a gas phase adsorption
of H2O and SO3 under UHV conditions. The absorption bands of hydrogen,
neutral water, hydronium cation and bisulfate anion were observed in
the in-situ spectra as a function of an electrode potential. Similar s
pectra could be reproduced by sequential gas doses of H2O and SO3 on P
t(111) at low temperatures under ultrahigh vacuum conditions (ex-situ
measurements). The various kinds of electrode reaction were responsibl
e for the real double layer structures as well as the electrode potent
ials.