Cu Nanoparticle Infiltration via Metal–Organic Decomposition Ink for Superior Mass Activity in CO Electroreduction

High Resolution Image Download MS PowerPoint Slide Achieving stable operation at high currents remains challenging for gas diffusion electrode (GDE)-based CO electrolyzers. Herein, we demonstrate the importance of Cu nanoparticle infiltration into the microporous layer to enrich local CO accessibility and mitigate electrolyte crossover. A facile GDE preparation method is developed via the doctor-blading method using a Cu metal–organic decomposition (Cu MOD) ink to produce well-dispersed nanoparticles across the porous layer. This design produces highly selective C 2+ products at –1200 mA cm –2 from the CO electroreduction reaction, achieving a remarkably high mass activity of approximately –28,000 A g –1 . It is found that the Cu electrodes prepared by MOD improve a stable balanced gas–liquid–solid interface by CO transport across the hydrophobic microenvironment of the inherent micropor…