High Rate Electrochemical Reduction of Carbon Monoxide to Ethylene using Cu-Nanoparticle-Based Gas Diffusion Electrodes
Han, L., Zhou, W., Xiang, C. High Rate Electrochemical Reduction of Carbon Monoxide to Ethylene using Cu-Nanoparticle-Based Gas Diffusion Electrodes. ACS Energy Letters, DOI: 10.1021/acsenergylett.8b00164 (2018)
This work achieved a high geometric partial current density of 50.8 mA cm-2 for electrochemical CO reduction to C2H4 at -0.85 V vs. RHE in a flow-through gas diffusion electrode (GDE).
Significance & impact
This work demonstrates that direct gas feed configurations, such as flow-through GDEs, provide a unique electrode structure for efficient and stable electrochemical reactions without mass transport limitations, especially for gases with low solubility in aqueous solutions, such as CO, CO2 and N2.
•Cu-nanoparticle-based GDEs were fabricated by applying a mixture of carbon powders, copper acetate aqueous solution, and Teflon onto a Cu gauze substrate. The catalyst-coated substrate was air-dried, mechanically pressed and subsequently annealed under forming gas to produce GDEs.
•In the flow through configuration, a high partial current density of 50.8 mA cm-2 and a Faraday efficiency of 17.8% for COR to C2H4 were achieved in 10 M KOH at -15oC, while in the flow-by configuration, the partial current density was limited to < 1 mA cm-2.