Enhancing C_≥2 product selectivity in electrochemical CO₂ reduction by controlling the microstructure of gas diffusion electrodes.

ABSTRACT: We fabricate polymer-based gas diffusion electrodes with controllable microstructure for the electrochemical reduction of CO₂, by means of electrospinning and physical vapor deposition. We show that the microstructure of the electrospun substrate is affecting the selectivity of a Cu catalyst, steering it from H₂ to C₂H₄ and other multicarbon products. Specifically, we demonstrate that gas diffusion electrodes with small pores (e.g. mean pore size 0.2 μm) and strong hydrophobicity (e.g. water entry pressure >1 bar) are necessary for achieving a remarkable faradaic efficiency of ∼50% for C₂H₄ and ∼75% for C_≥2 products in neutral 1M KCl electrolyte at 200 mA cm^-2. We observe a gradual shift f

SUBMITTER: Bernasconi F 

PROVIDER: S-EPMC10621631 | biostudies-literature | 2023 Nov

REPOSITORIES: biostudies-literature