Hydrophobized electrospun nanofibers of hierarchical porosity as the integral gas diffusion electrode for full-pH CO₂ electroreduction in membrane electrode assemblies

Abstract

Conventional gas diffusion electrode (GDE) in the laminate configuration has witnessed great success in boosting up the productivity of electrocatalytic CO2 reduction, but still suffers from issues of delamination, flooding,...

Controllable Preparation, Working Mechanisms, and Actual Application of Various One-Dimensional Nanomaterials as Catalysts for CO2RR: A Review

“…Through these methods and techniques, we can further investigate the different factors which can influence the performance of 1D nanomaterials. For instance, Peng 86 et al utilized an electrospinning technique to fabricate a hierarchically structured gas diffusion electrode using nickel nanofibers synthesized with embedded undercoordinated Ni-NC active sites carbon nanotube reinforced carbon nanofibers. The Ni nanofibers were hydrophobized with PTFE coating, enabling electrocatalytic CO 2 reduction experiments in a wide pH range.…”

Reaction Environment Regulation for Electrocatalytic CO2 Reduction in Acids

“…Wang et al fabricated an integral GDE composed of PTFE-coated carbon nanofibers embedded in NiÀ NÀ C through electrospinning (Figure 4i). [96] This integral structure boasts hierarchical porosity and active sites and features high mechanical and chemical stability; however, the superficial PTFE layer suffers from severe hydrophobicity loss in less than 20 h in acidic MEA. Replacement of the conventional Nafion binder with a stronger and more hydrophobic binder might be another option for enhancing the mechanical stability and simultaneously preventing electrode flooding.…”

An integrated carbonized wood-based gas-diffusion electrode for high-current-density CO electrosynthesis in flow cells

“…13–16 Therefore, the low solubility (∼34 mM) and slow diffusion of CO 2 in the aqueous electrolyte greatly limit the catalytic current density of the CO 2 RR to less than 100 mA cm −2 , which is not sufficient to meet the requirements of industrial-scale CO 2 electroreduction. 17–22…”