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Influence of Temperature on the Performance of Gas Diffusion Electrodes in the CO2 Reduction Reaction

Löwe, Armin and Rieg, Carolin and Hierlemann, Tim and Salas, Nicolas and Kopljar, Dennis and Wagner, Norbert and Klemm, Elias (2019) Influence of Temperature on the Performance of Gas Diffusion Electrodes in the CO2 Reduction Reaction. ChemElectroChem, 6 (17), pp. 4497-4506. Wiley. DOI: 10.1002/celc.201900872 ISSN 2196-0216

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Official URL: https://onlinelibrary.wiley.com/doi/full/10.1002/celc.201900872

Abstract

A detailed investigation of the influence of operating temperature on the electrochemical reduction of CO2 to formate at tin oxide loaded gas diffusion electrodes (GDEs). Ambient pressure electrolysis is performed between 20 and 70 °C with a focus on maximizing current density and energy efficiency while maintaining an average formate faradaic efficiency of at least 80 %. The best performance is achieved at a temperature of 50 °C, which allows a current density of 1000 mA cm−2. Lower or higher temperatures both show an increased hydrogen evolution at said current density. Further investigation of CO2 transport limitation revealed a minimum at 50 °C, which is explained by the opposing influence of temperature on CO2 diffusion coefficients and solubility. This explanation is supported by an estimate of the current density at which hydrogen evolution starts to increase based on the flooded agglomerate model. Long‐term operation for 24 h also revealed an optimum temperature of 50 °C, which helps to suppress the increasing rate of hydrogen evolution and with that a mechanical degradation of the GDE.

Item URL in elib:https://elib.dlr.de/130562/
Document Type:Article
Title:Influence of Temperature on the Performance of Gas Diffusion Electrodes in the CO2 Reduction Reaction
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Löwe, ArminUniversität Stuttgart, Institut für Technische ChemieUNSPECIFIED
Rieg, CarolinUniversität Stuttgart, Institut für Technische ChemieUNSPECIFIED
Hierlemann, TimUniversität Stuttgart, Institut für Technische ChemieUNSPECIFIED
Salas, NicolasUniversität Stuttgart, Institut für Technische ChemieUNSPECIFIED
Kopljar, DennisDennis.Kopljar (at) dlr.dehttps://orcid.org/0000-0002-2228-2016
Wagner, NorbertNorbert.Wagner (at) dlr.dehttps://orcid.org/0000-0002-2596-8689
Klemm, EliasUniversität Stuttgart, Institut für Technische ChemieUNSPECIFIED
Date:July 2019
Journal or Publication Title:ChemElectroChem
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:6
DOI :10.1002/celc.201900872
Page Range:pp. 4497-4506
Publisher:Wiley
ISSN:2196-0216
Status:Published
Keywords:Electrolysis; CO2-Conversion; Electrochemistry; Gas-Diffusion Electrodes
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Electrochemical Energy Storage
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Electrochemical Prcesses (Batteries), E - Elektrochemical Processes (Electrolysis), E - Electrochemical Processes (Fuel Cells)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Kopljar, Dennis
Deposited On:19 Dec 2019 15:29
Last Modified:19 Dec 2019 15:29

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