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Electrochemical CO2 Reduction : Tailoring Catalyst Layers in Gas Diffusion Electrodes

Title data

Junge Puring, Kai ; Siegmund, Daniel ; Timm, Jana ; Möllenbruck, Florian ; Schemme, Steffen ; Marschall, Roland ; Apfel, Ulf-Peter:
Electrochemical CO2 Reduction : Tailoring Catalyst Layers in Gas Diffusion Electrodes.
In: Advanced Sustainable Systems. Vol. 5 (2021) Issue 1 . - No. 2000088.
ISSN 2366-7486
DOI: https://doi.org/10.1002/adsu.202000088

Official URL: Volltext

Project information

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

The electrochemical conversion of CO2 into commodity chemicals or fuels is an attractive reaction for sustainable CO2 utilization. In this context, the application of gas diffusion electrodes is promising due to efficient CO2 mass transport. Herein, a scalable and reproducible method is presented for polytetrafluoroethylene (PTFE)-bound copper gas diffusion electrodes (GDEs) via the dry-pressing method and compositional parameters are emphasized to alter such electrodes. The assembly of the catalytic layer plays a critical role in the electrode performance, as elevated bulk hydrophobicity coupled with good surface wettability is observed to offer highest performance in 0.5 m KHCO3. With optimized electrodes, formate, CO, and H2 are obtained at a current density of 25 mA cm−2 as main products in 1 m KOH in faradaic efficiencies (FEs) of 27%, 30%, and 36%. At 200 mA cm−2, an altered product composition with ethylene (33% FE) and ethanol (9% FE) along with H2 (33% FE) is observed. In addition, n-propanol is observed with 7% faradaic efficiency. The results indicate that the composition of the GDE has a severe influence on the electrode performance and setting proper hydrophobicity gradients within the electrode is key toward developing a successful electrochemical CO2 reduction.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Carbon dioxid; Copper; Electrocatalysis; Ethylene; Gas diffusion electrodes
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Physical Chemistry III
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Physical Chemistry III > Chair Physical Chemistry III - Univ.-Prof. Dr. Roland Marschall
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 16 Feb 2021 09:17
Last Modified: 16 Feb 2021 09:17
URI: https://eref.uni-bayreuth.de/id/eprint/63085