Influence of the PTFE Membrane Thickness on the CO ₂ Electroreduction Performance of Sputtered Cu‐PTFE Gas Diffusion Electrodes

Gas diffusion electrodes (GDE) obtained by sputtering metal films on polytetrafluoroethylene (PTFE) membranes are among the most performant used to electrochemically reduce CO2. The present work reveals several essential aspects for fabricating PTFE-based gas (GDEs) CO2 electroreduction (CO2R). We show that adding an additive layer (a mixture of carbon and Nafion™ or only) is required stabilizing catalyst film (Cu), deposited via PTFE membrane, during CO2R experiments. found membrane thickness in GDE fabrication plays role electrode performance. quantification products formed conducted a flow-cell electrolyzer revealed thinner membranes, dominant process while thicker ones, H2 formation promoted. Thus, influences transport can be promote maintaining minimum production.