Gold Nanoparticles for CO2 Electroreduction: An Optimum Defined by Size and Shape
Size-selected Au nanoparticles peak in CO selectivity at ~3 nm, reaching 60% faradaic efficiency at low overpotentials. HRTEM identifies multiply twinned particles as the favourable morphology, with 8-fold coordinated surface sites at twin boundaries pinpointed as the key structural feature — offering a rational design target for CO₂-to-CO catalysts.