Electrochemical Impedance Characteristics of a Low-Temperature Single Cell for CO2/H2O Co-Reduction to Produce Syngas (CO+H2)
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Published:2022-11-30
Issue:4
Volume:13
Page:462-471
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ISSN:2093-8551
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Container-title:Journal of Electrochemical Science and Technology
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language:en
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Short-container-title:J. Electrochem. Sci. Technol
Author:
Ha Min Gwan,Shin Donghoon,Jung Jeawoo,Audasso Emilio,Song Juhun,Kim Yong-Tae,Park Hee-Young,Park Hyun S.,Na Youngseung,Jang Jong Hyun
Abstract
In this study, the electrochemical impedance characteristics of CO2/H2O co-reduction to produce CO/H2 syngas were investigated in a low-temperature single cell. The effect of the operating conditions on the single-cell performance was evaluated at different feed concentrations and cell voltages, and the corresponding electrochemical impedance spectroscopy (EIS) data were collected and analyzed. The Nyquist plots exhibited two semicircles with separated characteristic frequencies of approximately 1 kHz and tens of Hz. The high-frequency semicircles, which depend only on the catholyte concentration, could be correlated to the charge transfer processes in competitive CO2 reduction and hydrogen evolution reactions at the cathodes. The EIS characteristics of the CO2/H2O co-reduction single cell could be explained by the equivalent circuit suggested in this study. In this circuit, the cathodic mass transfer and anodic charge transfer processes are collectively represented by a parallel combination of resistance and a constant phase element to show low-frequency semicircles. Through nonlinear fitting using the equivalent circuit, the parameters for each electrochemical element, such as polarization resistances for high- and low-frequency processes, could be quantified as functions of feed concentration and cell voltage.
Funder
National Research Foundation of Korea
Ministry of Science and ICT
Korea Institute of Science and Technology
Ministry of Education, Science and Technology
University of Seoul
Publisher
The Korean Electrochemical Society - English Journal
Cited by
2 articles.
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