Choi, Juhyung Park, Sejin Kim, Dayeon Kim, Hyun Chul Yun, Hyewon Hong, Yewon An, Hyun Ji Lee, Taemin Lee, Noho Kim, Jaeeun Nam, Dae-Hyun Oh, Hyung-Suk Hwang, Yun Jeong 2025-11-21T02:59:07Z 2025-11-21T02:59:07Z 2025-11-11 2025-10 1530-6984 https://pubs.kist.re.kr/handle/201004/153614 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 C2+ 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 microporous layer. Our insights offer perspectives on a scalable strategy for optimizing catalyst positioning and advancing stable GDEs with high mass activity. English American Chemical Society Cu Nanoparticle Infiltration via Metal-Organic Decomposition Ink for Superior Mass Activity in CO Electroreduction Article 10.1021/acs.nanolett.5c04051 1 Nano Letters, v.25, no.42, pp.15346 - 15352 Nano Letters 25 42 15346 15352 Y scie scopus 001591518300001 2-s2.0-105019504117 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article CARBON-DIOXIDE REDUCTION PRODUCTS OPERANDO Cu metal-organic decomposition ink Microporouslayer Hydrophobicity CORR