Influence of polarization time and temperature on the adsorption of carbon dioxide on platinum

Journal Article · Sat Jan 01 04:00:00 EST 1994 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1.2054719· OSTI ID:142198

Maier, C U ^[1]; Bandi, A; Specht, M ^[2]

---

1. Stuttgart Univ. (Germany). Inst. of Physical Electronics
2. Solar and Hydrogen Energy Research Center, Stuttgart (Germany)

Cyclic voltammetry measurements were performed at platinum electrodes in 0.5 M H{sub 2}SO{sub 4} saturated with CO{sub 2}. Depending on the temperature and pre-polarization time of the electrode, different oxidation potentials of the adsorbed CO{sub 2} species are observed which provide evidence that three different intermediates are formed. From literature data it can be concluded that the adsorption at higher temperatures and short pre-polarization times favor the formation of COOH{sub ad} (oxidation potential 520 mV/SCE) as adsorbed intermediate, while lower temperatures and longer pre-polarization times (e.g., 30 min) favor the formation of CO{sub ad} (oxidation potential at about 650 mV/SCE). Pre-polarization times of several hours lead to an oxidation peak at 280 mV/SCE which is assigned to the adsorption product HCOOH{sub ad}.

• Sponsoring Organization: USDOE
• OSTI ID: 142198
• Journal Information: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 1 Vol. 141; ISSN JESOAN; ISSN 0013-4651
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
ADSORPTION
CARBON DIOXIDE
ELECTROCHEMISTRY
EXPERIMENTAL DATA
FORMIC ACID
PLATINUM
REACTION INTERMEDIATES
SORPTIVE PROPERTIES