The role of non-covalent interactions on CO bulk oxidation on Pt single crystal electrodes in alkaline electrolytes. (10th January 2015)

• Record Type: Journal Article
• Authors: Kodama, Kensaku; Morimoto, Yu; Strmcnik, Dusan S.; Markovic, Nenad M.
• Is Part Of: Electrochimica acta. Volume 152(2015)
• Page Start: 38
• Page End: 43
• Publication Date: 2015-01-10
• Subjects: Pt single crystal -- bulk CO oxidation -- alkaline -- cation effect -- copper; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2014.11.112
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: Highlights: Non-covalent interactions in bulk CO oxidation on Pt surface were investigated. The role of adislands in bulk CO oxidation in alkaline was demonstrated. The CO oxidation in pre-ignition region is more facile in alkaline than in acid. Trace levels of Cu 2+ dramatically improve the rate of bulk CO oxidation. The role of OHad coverage in non-covalent interactions was demonstrated. Abstract: The role of non-covalent interaction between both non-specifically adsorbed hydrated K +, Li + and Ba 2+ cations (M + ) and hydroxyl species (M + -OHad ) as well as underpotentially deposited Cu adatoms and OHad (Cuupd -OHad ) on bulk CO oxidation (COb ) is investigated on Pt(111) and Pt(100) in alkaline solutions. The effect of Cuupd -OHad on COb oxidation is observed almost at the reversible potential for CO oxidation, signaling that Cuupd -induced adsorption of OHad activates COb oxidation at very low overpotentials. In contrast, the effect of M + -OHad was found to be strongly dependent on the surface coverage of OHad on Pt; e.g., while no effect is found when the surface is pre-covered by adsorbed CO (COad ), a discernable effect is observed on OHad pre-covered Pt surface.