| Institution: | 1. Institute of Energy and Climate Research, Electrochemical Process Engineering (IEK-14), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
Faculty of Mechanical Engineering, RWTH Aachen University, Aachen, 52056 Germany;2. Department of Functional Materials, Business Division Fibers and Composites, Papiertechnische Stiftung, 01809 Heidenau, Germany;3. Laboratoire d'Electrochimie Moléculaire, Université Paris Cité, CNRS, F-75013 Paris, France;4. AIR LIQUIDE Forschung und Entwicklung GmbH, Innovation Campus Frankfurt, 60388 Frankfurt, Germany |
| Abstract: | The development of low-cost and efficient electrolyzer components is crucial for practical electrochemical carbon dioxide reduction (ECR). In this study, facile non-woven cellulose-based porous transport layers (PTLs) were developed for high current density CO2-to-CO conversion. By depositing a cobalt phthalocyanine (CoPc) catalyst-layer over the PTLs, we fabricated ECR-functioning gas-diffusion-electrodes (GDEs) for both flow-cell and zero-gap electrolyzers. Under optimal conditions, the Faradaic efficiency of CO (FECO) reached 92 % at a high current density of 200 mA cm−2. Furthering the architecture of the GDEs, CoPc was incorporated into the initial PTL slurry, forming ECR-active PTLs without the need for an additional catalyst-layer. The new GDE-architecture favored the CoPc-distribution by enhancing the contact and interactions with the carbon substrate and demonstrated a stable electrolysis process for over 50 h in a zero-gap cell at 200 mA cm−2 with a FECO of 80 %. |
