Aidan Q. Fenwick
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View article: A reversed gas diffusion electrode enables collection of high purity gas products from CO <sub>2</sub> electroreduction
A reversed gas diffusion electrode enables collection of high purity gas products from CO <sub>2</sub> electroreduction Open
Electrochemical CO 2 reduction (CO 2 R) in conventional systems typically generates highly diluted product output streams. Here we show that operating the gas diffusion electrode in a 'reverse' mode enables collection of gas products at hi…
Direct observation of the local microenvironment in inhomogeneous CO<sub>2</sub> reduction gas diffusion electrodes <i>via</i> versatile pOH imaging Open
We demonstrate pOH imaging with confocal microscopy to probe the microenvironment of an operating CO 2 reduction gas diffusion electrode. We find that the micrometer-scale morphology plays an important role in defining the CO 2 reduction p…
View article: Local microenvironment tuning induces switching between electrochemical CO<sub>2</sub> reduction pathways
Local microenvironment tuning induces switching between electrochemical CO<sub>2</sub> reduction pathways Open
We show that the pore size of the gas-diffusion layer used in electrochemical CO 2 reduction affects CO 2 mass transport. This directly influences the local reaction microenvironment, controlling the selectivity between CO and formate on A…
View article: Probing the Catalytically Active Region in a Nanoporous Gold Gas Diffusion Electrode for Highly Selective Carbon Dioxide Reduction
Probing the Catalytically Active Region in a Nanoporous Gold Gas Diffusion Electrode for Highly Selective Carbon Dioxide Reduction Open
We report the use of a nanoporous gold (np-Au) catalyst for CO₂ reduction in a gas diffusion electrode (GDE) and characterize the role of wetting in electrochemical performance. The np-Au catalyst has pores on the order of 20 nm and is cro…
View article: <i>Operando</i> Local pH Measurement within Gas Diffusion Electrodes Performing Electrochemical Carbon Dioxide Reduction
<i>Operando</i> Local pH Measurement within Gas Diffusion Electrodes Performing Electrochemical Carbon Dioxide Reduction Open
The local pH near the surface of a CO₂ reduction electrocatalyst strongly impacts catalytic selectivity and activity. Here, confocal fluorescence microscopy was used to map the electrolyte pH near a copper gas diffusion electrode during CO…
Selective CO<sub>2</sub> Electrochemical Reduction Enabled by a Tricomponent Copolymer Modifier on a Copper Surface Open
Electrochemical CO2 reduction over Cu could provide value-added multicarbon hydrocarbons and alcohols. Despite recent breakthroughs, it remains a significant challenge to design a catalytic system with high product selectivity. Here we dem…