In situ infrared study on the effect of pH on anion adsorption at Pt(111) electrodes from acid sulfate solutions

Journal Article · Wed Jan 24 04:00:00 EST 1996 · Langmuir

DOI:https://doi.org/10.1021/la950115u· OSTI ID:199392

Faguy, P W; Marinkovic, N S ^[1]; Adzic, R R ^[2]

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1. Univ. of Louisville, KY (United States)
2. Brookhaven National Lab., Upton, NY (United States)

From the in situ FTIR spectroscopy of the electrode/electrolyte solution interface at pH values of 1.2, 2.0 and 3.4, it can be confirmed that the adsorbate associated with the anomalous peaks in the cyclic voltammetry of Pt(111) in sulfate- and bisulfate-containing solutions is not the sulfate anion. The structure of the bisulfate-like adsorbate is tentatively postulated to be a sulfate ion/hydronium ion ion pair: SO{sub 4}{sup 2-}xH{sub 3}O{sup +}. Over the potentials in question, and only in solutions with appreciable HSO{sub 4}{sup -} concentration, can IR bands be found that are associated with the adsorbed species. 36 refs., 4 figs., 1 tab.

• Research Organization: Brookhaven National Laboratory (BNL), Upton, NY
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 199392
• Journal Information: Langmuir, Journal Name: Langmuir Journal Issue: 2 Vol. 12; ISSN 0743-7463; ISSN LANGD5
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
ADSORPTION
ANIONS
ELECTRODES
ELECTROLYTES
INFRARED SPECTRA
INTERFACES
ION PAIRS
PH VALUE
PLATINUM
SOLUTIONS
SULFATES
VOLTAMETRY