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Investigation of CO2 Electrolysis on Tin Foil by Electrochemical Impedance Spectroscopy

Bienen, Fabian and Kopljar, Dennis and Geiger, Simon and Wagner, Norbert and Klemm, Elias and Friedrich, K. Andreas (2020) Investigation of CO2 Electrolysis on Tin Foil by Electrochemical Impedance Spectroscopy. ACS Sustainable Chemistry and Engineering, 8 (13), pp. 5193-5199. American Chemical society (ACS). DOI: 10.1021/acssuschemeng.9b07625 ISSN 2168-0485

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Official URL: https://pubs.acs.org/doi/10.1021/acssuschemeng.9b07625

Abstract

The conversion of CO2 on tin catalysts via electrolysis leads to valuable chemicals like CO and formate and can help to close the carbon cycle. In the current literature, catalysts for the electrochemical CO2 reduction reaction (CO2RR) are amongst other methods characterized via electrochemical impedance spectroscopy (EIS) in terms of charge transfer resistances while neglecting the parallelly occurring hydrogen evolution reaction (HER). This may lead to an inapt assignment of the catalyst properties to the CO2RR, whereas the impedance spectrum displays features of the parasitic HER or mixed information of both the reactions. This circumstance is tackled systematically in this work by analyzing linear sweep voltammograms and impedance spectra under various experimental conditions to get more insights into the processes displayed in the respective impedance spectra. The main finding is that the observed high-frequency process displays a charge transfer reaction, which contains contributions of the HER and CO2RR and is not appropriate for evaluating catalysts for the CO2RR. This ambiguity was observed for experimental conditions where the HER or CO2RR prevailed. Additionally, equivalent circuit model (EQCM) simulations confirmed the occurrence of just one arc in the EIS spectrum for the parallelly occurring charge transfer reactions on the same electrode.

Item URL in elib:https://elib.dlr.de/136691/
Document Type:Article
Title:Investigation of CO2 Electrolysis on Tin Foil by Electrochemical Impedance Spectroscopy
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Bienen, FabianFabian.Bienen (at) dlr.dehttps://orcid.org/0000-0002-4660-8826
Kopljar, DennisDennis.Kopljar (at) dlr.dehttps://orcid.org/0000-0002-2228-2016
Geiger, Simonsimon.geiger (at) dlr.dehttps://orcid.org/0000-0003-3190-7185
Wagner, NorbertNorbert.Wagner (at) dlr.dehttps://orcid.org/0000-0002-2596-8689
Klemm, Eliaselias.klemm (at) itc.uni-stuttgart.deUNSPECIFIED
Friedrich, K. AndreasAndreas.Friedrich (at) dlr.dehttps://orcid.org/0000-0002-2968-5029
Date:13 March 2020
Journal or Publication Title:ACS Sustainable Chemistry and Engineering
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:8
DOI :10.1021/acssuschemeng.9b07625
Page Range:pp. 5193-5199
Publisher:American Chemical society (ACS)
ISSN:2168-0485
Status:Published
Keywords:CO2 electrolysis, CO2RR, electrochemical impedance spectroscopy, tin, formate, carbon dioxide, CO2
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Electrolysis and Hydrogen
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Elektrochemical Processes (Electrolysis)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Bienen, Fabian
Deposited On:23 Oct 2020 11:33
Last Modified:23 Oct 2020 11:33

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