Porous Bilayer Electrode‐Guided Gas Diffusion for Enhanced CO₂ Electrochemical Reduction

Cu2O nano-flowers/graphene enabled scaffolding structure catalyst layer for enhanced CO2 electrochemical reduction

“…Contrastingly, pure Cu2O (Figure 5f) does not form a porous structure within the catalyst layers, which reduces the CO2 mass transfer and promotes the HER, resulting in poor eCO2RR [36].…”

“…We also synthesised a Cu2O nanocube catalyst without graphene (which provides a dense catalyst layer for eCO2RR) to verify the effect of the catalyst layer structure using a previously reported synthesis method [36].…”

“…Recently, gas diffusion electrode (GDE) cells have been employed [22,34] for eCO2RR, where CO2 is fed directly through the gas diffusion layer to the catalyst layer surface, with a short diffusion distance for the gaseous reactants to reach the electroactive sites on the catalyst surface [35]. Wang et al [36] discovered a bilayer porous electrode with directional diffusion of gas molecules onto the catalyst layer and 94% FE to carbonaceous products at −1.0 V vs. RHE and a current density of 200 mA cm −2 . Dinh et al [34] developed a polymer-based hydrophobic gas diffusion electrode, which prevents flooding and has a stable catalyst surface on account of the carbon nanoparticles and graphite, and exhibits 70% FE towards ethylene at −0.55 V vs. RHE.…”