Issue 12, 2024

Equivalent circuit models for predicting electrical and gas output characteristics of CO2 electrolysis cells

Abstract

This paper proposes an equivalent circuit model that simulates the current–voltage characteristics, faradaic efficiency, and gas flow rates output from the cathode and anode channels for a CO2 to CO producing electrolysis cell. Considering that the CO2 flow rate introduced into the cathode channel limits the CO partial current density, this model can predict the output of CO, H2, and CO2 flow rates from the cathode channel. Furthermore, the model also enables the prediction of CO2 flow rate output from the anode channel by assuming that both the carbonate and hydrogen carbonate ions transfer from the cathode side to the anode side. These simulations are validated using experimental results of the dependence of the electrical and gas output characteristics on the CO2 flow rate. Our results show that the proposed model based on electrochemical kinetics and ion transfer phenomena can contribute to efficient power supply controllers and auxiliary equipment designs for CO2 electrolysis systems.

Graphical abstract: Equivalent circuit models for predicting electrical and gas output characteristics of CO2 electrolysis cells

Supplementary files

Article information

Article type
Paper
Submitted
27 Des 2023
Accepted
29 Apr 2024
First published
14 Mei 2024
This article is Open Access
Creative Commons BY license

Sustainable Energy Fuels, 2024,8, 2649-2658

Equivalent circuit models for predicting electrical and gas output characteristics of CO2 electrolysis cells

Y. Kudo, A. Ono, S. Mikoshiba and R. Kitagawa, Sustainable Energy Fuels, 2024, 8, 2649 DOI: 10.1039/D3SE01709E

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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