Insight into the Electrooxidation Mechanism of Ethylene Glycol on Palladium-Based Nanocatalysts: In Situ FTIRS and LC-MS Analysis

Author(s)

Da Silva, Rodrigo Garcia ^{[1, 2]} ; Rodrigues de Andrade, Adalgisa ^[1] ; Servat, Karine ^[2] ; Morais, Claudia ^[2] ; Napporn, Teko W. ^[2] ; Kokoh, Kouakou B. ^[2]

Affiliation

^[1] Univ Sao Paulo, Dept Quim, Fac Filosofia Ciencias & Letras Ribeirao Preto, BR-14040901 Ribeirao Preto - Brazil

^[2] Univ Poitiers, Dept Chem, IC2MP CNRS UMR 7285, 4 Rue Michel Brunet B27, TSA 51106, F-86073 Poitiers 9 - France

• Document type: Journal article
• Source: CHEMELECTROCHEM; v. 7, n. 21 SEP 2020.
• Web of Science Citations: 0

Abstract

The ethylene glycol oxidation reaction on nickel and ruthenium modified palladium nanocatalysts was investigated with electrochemical, spectroelectrochemical, and chromatographic methods. These carbon-supported materials, prepared by a revisited polyol approach, exhibited high activity towards the ethylene glycol electrooxidation in alkaline medium. Electrolysis coupled with high performance liquid chromatography/mass spectrometry (HPLC-MS) and in situ Fourier transform infrared spectroscopy (FTIRS) measurements allowed us to determine the different compounds electrogenerated in the oxidative conversion of this two-carbon molecule. High value-added products such as oxalate, glyoxylate, and glycolate were identified in all electrolytic solutions, whereas glyoxylate was selectively formed at the Ru-45@Pd-55/C electrode surface. In situ FTIRS results also showed a decrease in the pH value in the thin layer near the electrode as a consequence of OH(-)consumption during the spectroelectrochemical experiments. (AU)

• FAPESP's process: 12/07654-3 - Preparation and characterization of bioanodos for biofuel cell glucose/O2 using PAMAM dendrimer as immobilization matrix
• Grantee: Laís Boracini Crepaldi
• Support type: Scholarships in Brazil - Master