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

Rodrigo Garcia G da Silva (1, 2) , Adalgisa Rodrigues de Andrade (2) , Karine Servat (1) , Cláudia Morais (1) , Teko Napporn (1) , Kouakou Boniface Kokoh (1)

1 IC2MP [Poitiers] - Institut de chimie des milieux et matériaux de Poitiers [UMR 7285]
2 Universidade de São Paulo, Faculdade de Filosofia Ciências e Letras de Ribeirão Preto, Departamento de Química, Ribeirão Preto

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 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 the electrolytic solutions, while glyoxylate was selectively formed at the Ru45@Pd55/C electrode surface. In situ FTIRS results also showed a decrease of the pH value in the thin layer near the electrode as a consequence of OH- consumption during the spectroelectrochemical experiments.

Mots clés: Ethylene glycol; electrochemistry; energy conversion; fuel cells; heterogeneous catalysis

Domaines: Chimie

Rodrigo Garcia G da Silva, Adalgisa Rodrigues de Andrade, Karine Servat, Cláudia Morais, Teko Napporn, et al.. Insight into the Electrooxidation Mechanism of Ethylene Glycol on Pd‐Based Nanocatalysts: In Situ FTIRS and LC‐MS Analysis. ChemElectroChem, 2020, 7 (21), pp.4326-4335. ⟨10.1002/celc.202001019⟩. ⟨hal-03049212⟩