Oscillatory ethylene glycol electrooxidation reaction on Pt in alkaline media: The effect of surface orientation

Author(s)

da Silva, Kaline Nascimento ; Nagao, Raphael ; Sitta, Elton

• Document type: Journal article
• Source: Electrochimica Acta; v. 360, p. 8-pg., 2020-11-10.

Abstract

The ethylene glycol (EG) electrooxidation reaction was studied in alkaline media using three distinct platinum catalysts, named Pt(110), Pt(111) and Pt(poly) (or polycrystalline). While the reaction showed potential oscillations under current control when catalyzed by both Pt(poly) and Pt(111), no oscillations were observed employing Pt(110) once different amounts of adsorbed EG intermediates take place on the surfaces. Galvanostatic time-series (GTS) depicted a faster drift, i.e. amplitude, period and oscillation shape changes over time, on Pt(111) than in Pt(poly) for several EG concentrations and electrolyte temperatures, this behavior being explained by means of the maximum potential reached in each oscillation cycle and distinct mechanisms that trigger non-reversible processes on these surfaces. (c) 2020 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 16/01817-9 - Design and control of self-organized electrochemical patterns
• Grantee: Raphael Nagao de Sousa
• Support Opportunities: Research Grants - Young Investigators Grants
• 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
• FAPESP's process: 16/14758-0 - Instabilities in electrocatalysis: complex kinetics catalyzed by model PT surfaces
• Grantee: Kaline Nascimento da Silva
• Support Opportunities: Scholarships in Brazil - Master