scillatory dynamics during the methanol electrooxidation reaction on Pt(111

Author(s)

da Silva, Kaline Nascimento ^[1] ; Sitta, Elton ^{[1, 2]}

Affiliation

^[1] Univ Fed Sao Carlos, Dept Chem, Rod Washington Luis, Km 235, BR-13565905 Sao Carlos - Brazil

^[2] Ctr Innovat New Energies, BR-13083841 Campinas - Brazil

• Document type: Journal article
• Source: Physical Chemistry Chemical Physics; v. 23, n. 39 AUG 2021.
• Web of Science Citations: 1

Abstract

Despite several papers describing the oscillatory methanol electrooxidation reaction (OMOR) catalyzed by polycrystalline Pt, these dynamic instabilities are less explored on single crystalline surfaces. Herein, we observed and mapped for the first time the OMOR on Pt(111) in non-adsorbing anion solutions as well as in the presence of small amounts of sulfate anions. Period 1 oscillations with oscillation frequencies from 1.2 to 2.0 Hz were observed for methanol concentrations higher than 1.0 M, with no evolution to more complex patterns. These oscillations occur in the potential range in which PtOH is partially covering the surface without irreversible oxidation processes. Small changes in both the mean potential (E-m) and the poisoning rate along the time-series were observed, the so-called drift, and were explained in terms of the accumulation of intermediates at the interface. The presence of sulfate strongly inhibits the OMOR, and the results are discussed in terms of sulfate adlayer formation on [111] domains. (AU)

• FAPESP's process: 17/11986-5 - Generation and storage of New Energy: bringing technological development for the country
• Grantee: Ana Flávia Nogueira
• Support Opportunities: Research Grants - Research Centers in Engineering Program
• FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
• Grantee: Elson Longo da Silva
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC