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Quantifying mass transport limitations in a microfluidic CO<sub>2</sub> electrolyzer with a gas diffusion cathode

Engineering and Technology

Quantifying mass transport limitations in a microfluidic CO<sub>2</sub> electrolyzer with a gas diffusion cathode

V. G. Agarwal and S. Haussener

This cutting-edge research by Venu Gopal Agarwal and Sophia Haussener presents a two-dimensional model of a gas diffusion electrode-based microfluidic CO2 electrolyzer. The model reveals intriguing insights into cathodic reactions, highlighting a peak in CO partial current density before decline due to CO2 depletion, and suggests improvements to tackle catalyst underutilization.

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Playback language: English
Abstract
A two-dimensional model of a gas diffusion electrode (GDE)-based microfluidic CO<sub>2</sub> electrolyzer is developed and validated against experimental data. The model predicts an initial rise in CO partial current density (PCD), peaking at 75 mA cm<sup>−2</sup> at −1.3 V vs RHE, then declining due to CO<sub>2</sub> depletion near the catalyst surface. Electrolyte and CO<sub>2</sub> flow rates influence PCD, with a trade-off between high PCD and CO<sub>2</sub> conversion efficiency. Significant catalyst underutilization is observed, suggesting improvements like varying electrode porosity and anisotropic layers to enhance mass transport and PCD.
Publisher
Communications Chemistry
Published On
Mar 05, 2024
Authors
Venu Gopal Agarwal, Sophia Haussener
Tags
CO2 electrolyzer
gas diffusion electrode
microfluidics
current density
catalyst underutilization

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