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Highly selective Ag foam gas diffusion electrodes for CO₂ electroreduction by pulsed hydrogen bubble templation

Title data

Hoffmann, Hendrik ; Kutter, Maximilian ; Osiewacz, Jens ; Paulisch-Rinke, Melanie-Cornelia ; Lechner, Steffen ; Ellendorff, Barbara ; Hilgert, Annika ; Manke, Ingo ; Turek, Thomas ; Roth, Christina:
Highly selective Ag foam gas diffusion electrodes for CO₂ electroreduction by pulsed hydrogen bubble templation.
In: EES Catalysis. (2023) .
ISSN 2753-801X
DOI: https://doi.org/10.1039/D3EY00220A

Abstract in another language

The electrochemical reduction of carbon dioxide to valuable fossil-free products opens up a way to close the carbon cycle, if based solely on renewable energy sources. Making the process industrially viable, however, needs high CO2 conversion rates, efficient electrodes, and high selectivity for desired products. To reach this goal, highly catalytically active porous electrodes with maximized surface areas are required. We combined pulsed electrochemical deposition of the Ag foam catalyst with ionomer infiltration of the electrode to produce Ag-based gas diffusion electrodes (GDEs) in a facile and fast production process. Using the dynamic hydrogen bubble templation method (DHBT), we utilized the parasitic hydrogen evolution reaction (HER) to aid the solvent free structuring of the 3D catalyst network and directly manufacture a GDE. Different deposition parameters and in particular pulse-to-pause ratios increased the amount of deposited catalyst and successfully reduced the overpotential during CO2RR operation. To inhibit electrode flooding and decrease CO2 mass transport limitations during CO2RR, we further infiltrated the electrode with a suitable perfluorosulfonic acid ionomer. SEM and EDS analyses showed a homogeneous Ag/F distribution along the cross section of the electrodes. These electrodes catalyzed the conversion of CO2 to CO at industrially viable current densities of 500 mA cm−2 with an unprecedented faradaic efficiency up to 76% in 1 M KHCO3.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Engineering Science > Chair Electrochemical Process Engineering > Chair Electrochemical Process Engineering - Univ.-Prof. Dr. Christina Roth
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 25 Oct 2023 08:46
Last Modified: 25 Oct 2023 08:46
URI: https://eref.uni-bayreuth.de/id/eprint/87382