An in-situ electrochemical IR investigation of solution CO electro-oxidation on a polycrystalline Au surface in an alkaline electrolyte: Identification of active reaction intermediates

Chen, De-Jun; Tong, YuYe J.

doi:10.1016/j.jelechem.2017.04.045

Title: An in-situ electrochemical IR investigation of solution CO electro-oxidation on a polycrystalline Au surface in an alkaline electrolyte: Identification of active reaction intermediates

Journal Article · Wed Apr 26 00:00:00 EDT 2017 · Journal of Electroanalytical Chemistry

DOI:https://doi.org/10.1016/j.jelechem.2017.04.045· OSTI ID:1533978

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Georgetown University, Washington, DC (United States)

Here we report an in-situ electrochemical surface enhanced IR reflection absorption spectroscopic (SEIRAS) study of carbon monoxide electro-oxidation reaction (COR) of CO dissolved in alkaline supporting electrolyte (CO_sol). With judiciously chosen concentration of OH^-, we were able to observe for the first time the vibrational band of the weakly adsorbed CO_w in an alkaline solution and identify it as the active reaction intermediate for the COR of CO_sol, as in the acidic media. With the help of deuterium labeling, we were also able to confirm spectroscopically, again for the first time, the previously proposed CO-adsorption-promoted-OH-adsorption hypothesis. We proposed a reaction mechanism accordingly that consists of (1) CO-adsorption-promoted OH adsorption, (2) formation of weakly-bound CO_w from CO_sol, and (3) the oxidation of CO_w by a surface-anchored weakly-hydrogen-bound species. We believe that the synergistic actions of these elemental chemical processes are the reasons for the observed unusually high activity of COR of CO_sol in an alkaline solution.

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Research Organization:: Georgetown Univ., Washington, DC (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-07ER15895

OSTI ID:: 1533978

Alternate ID(s):: OSTI ID: 1550515

Journal Information:: Journal of Electroanalytical Chemistry, Vol. 800, Issue C; ISSN 1572-6657

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 9 works

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
carbon monoxide electro-oxidation reaction
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Title: An in-situ electrochemical IR investigation of solution CO electro-oxidation on a polycrystalline Au surface in an alkaline electrolyte: Identification of active reaction intermediates

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