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Effects of microporous layer on electrolyte flooding in gas diffusion electrodes and selectivity of CO2 electrolysis to CO

Journal Article (2022)
Authors

Yuming Wu (University of Queensland)

Sahil Garg (Technical University of Denmark (DTU))

Mengran Li (TU Delft - ChemE/Materials for Energy Conversion and Storage)

Mohamed Nazmi Idros (University of Queensland)

Zhiheng Li (University of Queensland)

Rijia Lin (University of Queensland)

Jian Chen (University of Queensland)

Guoxiong Wang (University of Queensland)

Thomas E. Rufford (University of Queensland)

Research Group
ChemE/Materials for Energy Conversion and Storage
Copyright
© 2022 Yuming Wu, Sahil Garg, Mengran Li, Mohamed Nazmi Idros, Zhiheng Li, Rijia Lin, Jian Chen, Guoxiong Wang, Thomas E. Rufford
To reference this document use:
https://doi.org/10.1016/j.jpowsour.2022.230998
More Info
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Publication Year
2022
Language
English
Copyright
© 2022 Yuming Wu, Sahil Garg, Mengran Li, Mohamed Nazmi Idros, Zhiheng Li, Rijia Lin, Jian Chen, Guoxiong Wang, Thomas E. Rufford
Research Group
ChemE/Materials for Energy Conversion and Storage
Volume number
522
DOI:
https://doi.org/10.1016/j.jpowsour.2022.230998
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Abstract

Understanding the relationship between gas diffusion electrode (GDE) structures and the performance of electrochemical CO2 reduction reaction (CO2RR) is crucial to developing industrial-scale technologies to convert CO2 to valuable products. We studied how the microporous layer (MPL) on GDE's coated with silver nanoparticle catalysts affects the electrochemical CO2 conversion to CO in a flow cell electrolyser. We demonstrate a convenient method to measure the rate of catholyte seepage through a GDE during CO2RR experiments and used this method to show how the MPL thickness affects flooding of the GDE. We found the GDE with the thickest MPL (39BB) had the best selectivity for CO and stability at current densities above 100 mA cm−2 as the thick MPL minimized flooding. However, at low current densities the 39BB electrode achieved a lower CO selectivity than the GDE with thinner MPL. These results suggest opportunities to improve CO2 electrolyser performances at high current by optimisation of the MPL structure and wettability.