AN IN-SITU INFRARED STUDY ON THE EFFECT OF PH ON ANION ADSORPTION AT PT(111) ELECTRODES FROM ACID SULFATE-SOLUTIONS

Authors
FAGUY PW MARINKOVIC NS ADZIC RR
Citation
Pw. Faguy et al., AN IN-SITU INFRARED STUDY ON THE EFFECT OF PH ON ANION ADSORPTION AT PT(111) ELECTRODES FROM ACID SULFATE-SOLUTIONS, Langmuir, 12(2), 1996, pp. 243-247
Citations number
36
Categorie Soggetti
Chemistry Physical
Journal title
Langmuir → ACNP
ISSN journal
07437463
Volume
12
Issue
2
Year of publication
1996
Pages
243 - 247
Database
ISI
SICI code
0743-7463(1996)12:2<243:AIISOT>2.0.ZU;2-#
Abstract
From the in situ FTIR spectroscopy of the electrode/electrolyte soluti on interface at pH values of 1.2, 2.0, and 3.4, it can be confirmed th at the adsorbate associated with the anomalous peaks in the cyclic vol tammetry of Pt(111) in sulfate- and bisulfate-containing solutions is not the sulfate anion. The structure of the bisulfate-like adsorbate i s tentatively postulated to be a sulfate ion/hydronium ion ion pair: S O42-. H3O+. Over the potentials in question, and only in solutions wit h appreciable HSO4- concentration, can IR bands be found that are asso ciated with the adsorbed species.