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Spray-printing of composite gas diffusion electrodes with controllable porosity and hydrophobicity based on nanoparticles and polymeric binder
(Liha-Pres, 2023) Liyong Xi; Puiki Leung; Yong Zuo
This research evaluates the effectiveness of various composite Gas Diffusion Electrode (GDE) architectures for carbon dioxide reduction. The study employs a flexible spray printing technique to create hydrophobic porous structures using a blend of carbon or metal nanopowders and a polymeric binder. The resulting porous layers serve as different electrode layers, including Gas Diffusion Layers (GDLs), Microporous Layers (MPLs), and catalyst supports, which can enhance the activity and hydrophobicity of GDEs. The study finds that the increased surface roughness (porous structures) and Polyvinylidene fluoride (PVDF) content in these porous layers improve their hydrophobicity/flooding tolerance. The study demonstrates that the selective production of ethylene can be sustained for over 10 hours at a high current density of –200 mA cm–2 when porous MPL and catalyst support layers are added. The use of hydrophobic porous structures as electrode layers can provide a cost-effective and scalable approach to enhance the hydrophobicity and activity of GDEs. Furthermore, the extended duration of electrolysis using these porous layers has the potential to create more efficient and sustainable electrocatalysts for carbon dioxide reduction.