Surface coating combined with in situ cyclic voltammetry to enhance the stability of gas diffusion electrodes for electrochemical CO2 reduction

Gas diffusion electrodes (GDEs) play a crucial role in the development of electro-chemical CO2 reduction (eCO2R) towards an conomically viable process. While membrane electrode assemblies (MEAs) are currently the most efficient approach due to their low cell voltage, electrolyte supported GDEs still present a valuable tool for the characterization of catalysts under industrially relevant current densities, allowing for direct measurement of the electrode potential against reference electrodes. In this study, common experimental methods of iR correction and pressure control in eCO2R literature studies on GDEs are analyzed and compared regarding their potential impact on the reported results. It is revealed that failure to account for dynamic changes in iR-drop can lead to significant inaccuracies in reported electrode potentials. Additionally, common methods for the application of differential pressure across GDEs are shown to impact the performance, leading to additional errors in experimental results. Based on these findings, an experimental protocol for the application of single high frequency response as a method for iR correction is developed, providing a tool for reproducible electrochemical characterization of GDEs in eCO2R.

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Microenvironment engineering by targeted delivery of activated Ag NPs for boosting electrocatalytic CO2 reduction reaction

Wang,

Xu,

Yang

et al. 2024

Preprint

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To boost the performance of electrocatalytic CO2 reduction reaction (eCO2RR), a unique synthetic method that deploys the in situ reduction of precoated precursors was developed to produce activated Ag nanoparticles (NPs) within the gas diffusion layer (GDL), where the thus-obtained Ag NPs-Skeleton could block direct contact between the active Ag sites and electrolyte. Specifically, compared to the conventional surface loading mode in the acidic media, our freestanding and binder free electrode could achieve obvious higher CO selectivity of 94%, CO production rate of 23.3 mol g-1 h-1, single-pass CO2 conversion of 58.6%, and enhanced long-term stability of 8 hours. Our study shows that delivering catalysts within the GDL does not only gain the desired physical protection from GDL skeleton to achieve a superior local microenvironment for more efficient pH-universal eCO2RR, but also manifests the pore structures to effectively address gas accumulation and flood issues, thereby stabilizing the catalysts.

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Surface coating combined with in situ cyclic voltammetry to enhance the stability of gas diffusion electrodes for electrochemical CO2 reduction

Cited by 3 publications

References 71 publications

Alternative anode paired to electrocatalytic CO2 reduction

Alternative anode paired to electrocatalytic CO2 reduction

Method—Best Practices and Common Pitfalls in Experimental Investigation of Electrochemical CO₂ Reduction at Gas Diffusion Electrodes

Microenvironment engineering by targeted delivery of activated Ag NPs for boosting electrocatalytic CO2 reduction reaction

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Surface coating combined with in situ cyclic voltammetry to enhance the stability of gas diffusion electrodes for electrochemical CO2 reduction

Cited by 3 publications

References 71 publications

Alternative anode paired to electrocatalytic CO2 reduction

Alternative anode paired to electrocatalytic CO2 reduction

Method—Best Practices and Common Pitfalls in Experimental Investigation of Electrochemical CO2 Reduction at Gas Diffusion Electrodes

Microenvironment engineering by targeted delivery of activated Ag NPs for boosting electrocatalytic CO2 reduction reaction

Contact Info

Product

Resources

About

Method—Best Practices and Common Pitfalls in Experimental Investigation of Electrochemical CO₂ Reduction at Gas Diffusion Electrodes