10.1021/jp710386g.s002
Masatoshi Osawa
Masatoshi
Osawa
Minoru Tsushima
Minoru
Tsushima
Hirokazu Mogami
Hirokazu
Mogami
Gabor Samjeské
Gabor
Samjeské
Akira Yamakata
Akira
Yamakata
Structure of Water at the Electrified Platinum−Water Interface: A Study by
Surface-Enhanced Infrared Absorption Spectroscopy
American Chemical Society
2008
surface
electrode
2SO
CO
bulk water
2008-03-20 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Structure_of_Water_at_the_Electrified_Platinum_Water_Interface_A_Study_by_Surface_Enhanced_Infrared_Absorption_Spectroscopy/2950120
Surface-enhanced infrared absorption spectroscopy in the attenuated total reflection mode is used to examine
the structure of water on a polycrystalline Pt electrode in H<sub>2</sub>SO<sub>4</sub> and HClO<sub>4</sub> as a function of applied potential.
The electrode surface covered with CO is used as the reference in recording spectra, which enables us to
obtain the <i>absolute</i> infrared spectrum of the interfacial water layer (monolayer or bilayer) in contact with the
surface with negligible interference from the bulk water. The spectrum of the interfacial water is largely
different from that of bulk water and changes around the potential of zero charge of the electrode. The spectral
changes are ascribed to the potential-dependent reorientation of water molecules from a weakly hydrogen-bonded oxygen-up orientation at the negatively charged surface to a strongly hydrogen-bonded nearly flat
orientation at the positively charged surface in agreement with theoretical simulations reported in the literature.
Clear experimental evidence of the formation of a stable ice-like structured water on the positively charged
surface is reported.