Unlocking direct CO2 electrolysis to C3 products via electrolyte supersaturation - Université de Montpellier
Article Dans Une Revue Nature Catalysis Année : 2023

Unlocking direct CO2 electrolysis to C3 products via electrolyte supersaturation

Kun Qi
Nicolas Onofrio
Xiaoqiang Cui
Jinchang Fan
  • Fonction : Auteur
Jiandong Wu
  • Fonction : Auteur
Damien Voiry

Résumé

The electroreduction of CO2 has recently achieved notable progress in the formation of C2 products such as ethylene and ethanol. However, the direct synthesis of C3 products is considerably limited by the C2–C1 coupling reaction and the faradaic efficiency has remained low. Here we present a supersaturation strategy for the electrosynthesis of 2-propanol from CO2 in highly carbonated electrolytes. By controlling the CO2 concentration above the saturation limit, we have developed a co-electrodeposition method with suppressed galvanic replacement to obtain a CuAg alloy catalyst. In supersaturated conditions, the alloy achieved high performance for the production of 2-propanol with a faradaic efficiency of 56.7% and at a specific current density of 59.3 mA cm−2. Our investigations revealed that the presence of dispersed Ag atoms in Cu weakens the surface binding of intermediates in the middle position of the alkyl chain and strengthens the C–O bonds, which favours the formation of 2-propanol over 1-propanol.
Fichier principal
Vignette du fichier
Manuscript_DV_Hall.pdf (498.17 Ko) Télécharger le fichier
Origine Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-04095481 , version 1 (03-10-2023)

Identifiants

Citer

Kun Qi, Yang Zhang, Nicolas Onofrio, Eddy Petit, Xiaoqiang Cui, et al.. Unlocking direct CO2 electrolysis to C3 products via electrolyte supersaturation. Nature Catalysis, 2023, 6 (4), pp.319-331. ⟨10.1038/s41929-023-00938-z⟩. ⟨hal-04095481⟩
69 Consultations
175 Téléchargements

Altmetric

Partager

More