Plastron effect enhanced electrochemical CO₂ reduction activity over hydrophobic three-dimensional nanoporous silver

The electrochemical reduction of CO₂ on catalyst surfaces is hindered by the inefficient mass transfer of CO₂ in aqueous solutions. In this study, we employed an electrochemical reduction approach to fabricate a hydrophobic three-dimensional nanoporous silver catalyst with a plastron effect, aiming to enhance the CO₂ diffusion. The resulting catalyst exhibited an exceptional performance with the FE_CO peaking at 95% at -0.65 V (vs. RHE) and demonstrated remarkable stability during continuous electrolysis for 48 hours. Control experiments, together with Tafel analysis, EIS measurements, and contact angle results, confirmed that the notable enhancement of performance was attributed to the hydrophobic porous structure that facilitated efficient storage and rapid mass transfer of low-solubility CO₂ gas reactants.