Upscaling and continuous operation of electrochemical CO2 to CO conversion in aqueous solutions on silver gas diffusion electrodes

Jeanty, P.; Scherer, Christian; Mágori, Erhard; Wiesner‐Fleischer, Kerstin; Hinrichsen, Olaf; Fleischer, Maximilian

doi:10.1016/j.jcou.2018.01.011

Cited by 173 publications

(192 citation statements)

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“…Moreover, catholyte that flows at the opposite side of the GDE can flood the GDE, typically due to electrowetting, blocking CO 2 diffusion paths which increases the concentration gradient even more . This electrolyte flux is, however, crucial to avoid crystallization inside the pores of the carbon paper . Therefore, the differential pressure across the GDE is a factor to take into account in the optimization of the cathodic performance as we thoroughly analyzed in previous work .…”

Section: Introductionmentioning

confidence: 99%

“…However, in the FT configuration gas bubbles emerge in the catholyte, increasing the ohmic drop . Furthermore, in this configuration perspiration (i. e. small leakage of catholyte through the GDE towards the gas channel) can lead to electrolyte salt precipitation inside the GDE, blocking the GDE over time …”

Section: Introductionmentioning

confidence: 99%

“…[8] As a result catalytic activity is limited, hindering the CO 2 electrochemical reduction reaction performance. [6,[8][9][10] Hence, efficient CO 2 supply towards the catalyst surface is of utmost importance to make electrochemical CO 2 electrolyzers industrially feasible.…”

Section: Introductionmentioning

confidence: 99%

“…[11] This electrolyte flux is, however, crucial to avoid crystallization inside the pores of the carbon paper. [12] Therefore, the differential pressure across the GDE is a factor to take into account in the optimization of the cathodic performance as we thoroughly analyzed in previous work. [13] In the flow-through configuration the CO 2 is forced to flow through the GDE pores, diminishing the concentration gradient through the increased supply rate of CO 2 towards the catalyst surface.…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical Reduction of CO₂: Effect of Convective CO₂ Supply in Gas Diffusion Electrodes

et al. 2019

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The electrochemical reduction of carbon dioxide (CO2) is a promising technology in light of energy transition and industrial electrification. In this study, two different electrolyzer configurations, flow‐through and flow‐by modes, were analyzed for the production of carbon monoxide to resolve the CO2 mass‐transfer limitation problem at high current densities in gas diffusion electrodes. These two configurations respectively state convective and diffusive flow inside the gas diffusion layer, and their effect was studied on the cathodic performance of the electrolyzer by varying the operating conditions: cathodic potential, electrocatalyst loading, and Nafion content. In flow‐through configuration, a current density of 220 mA/cm2 could be achieved at a faradaic efficiency of 90 %; whereas, in the flow‐by configuration, the current density was at the same faradaic efficiency limited to 140 mA/cm2. However, the flow‐through configuration has a few limitations, such as lower energy efficiency, owing to the higher ohmic drop and the faster deactivation caused by crystallization of electrolyte salts inside the gas diffusion electrode. Therefore, flow‐by mode is currently the most adequate configuration for the long‐term operation of electrolyzers for the reduction of CO2 to CO. This study represents an essential step toward the application of electrolyzers for the electroreduction of CO2.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Electrochemical Reduction of CO₂: Effect of Convective CO₂ Supply in Gas Diffusion Electrodes

et al. 2019

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“…Note that that the metal‐based electrocatalysts were characterized in liquid/membrane/liquid systems (instead of providing the CO 2 in gaseous form, e.g., Dufek et al. and Ramdin et al …”

Section: Toward Syngas Generation On An Industrial Scalementioning

confidence: 99%

Metal–Nitrogen–Carbon Electrocatalysts for CO₂ Reduction towards Syngas Generation

2020

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Shifting syngas (an H2/CO mixture) production away from fossil‐fuel‐dependent processes (e.g., steam methane reforming and coal gasification) is mandatory, as syngas is of interest as both a fuel and as a value‐added chemical precursor. With appropriate electrocatalysts, such as silver‐based and metal–nitrogen–carbon (M‐N‐C) materials, the electrochemical CO2 reduction reaction (CO2RR) allows for the production of CO alongside H2 (from the hydrogen evolution reaction), and thus leads to syngas generation. In this Minireview, the application of M‐N‐C electrocatalysts for syngas generation is discussed. The mechanisms leading to different faradaic selectivities for CO are reviewed as a function of the nature of the metal, by using both computational and experimental approaches. The role played by the metal‐free moieties in the M‐N‐C electrocatalysts is underlined. Since M‐N‐C electrocatalysts only recently entered the CO2RR field (as opposed to Cu‐, Ag‐, or Au‐based nanostructures), they have been mainly characterized in static liquid environments, in which the reaction rate is significantly hampered by CO2‐dissolution/diffusion limitations. Therefore, the design of CO2RR electrolyzers for M‐N‐C electrocatalysts is addressed, and designs such as zero‐gap electrolyzers with anionic membranes and humidified CO2 gas feed at the cathode are highlighted.

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The Role of Undercoordinated Sites on Zinc Electrodes for CO₂ Reduction to CO

Kang

Kolb

Calle‐Vallejo

et al. 2022

Adv Funct Materials

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The electrochemical CO2 reduction reaction (CO2RR) using renewable energies is a promising route toward global carbon neutrality. Recently, the use of copper catalysts and CO feedstocks, instead of CO2, has been shown to enhance the selectivity toward multicarbon products, leading to increased efforts in developing tandem electrocatalytic systems. State‐of‐the‐art CO2‐to‐CO electrocatalysts are mainly based on noble metals such as silver and gold. Earth‐abundant zinc, in contrast, displays poorer selectivity and activity. Herein, the use of porous dendritic oxidederived zinc (OD‐Zn) catalysts for CO2RR is reported. These catalysts can reduce CO2 to CO with a maximum Faradaic efficiency of 86% at −0.95 V versus reversible hydrogen electrode (RHE) and partial current density of −266 mA cm–2 at −1.00 V vs RHE. OD‐Zn is further found to have a higher amount of undercoordinated sites and exhibits higher CO2RR activity and CO selectivity than electrodeposited Zn metal. While oxygen vacancies have been previously implicated as active sites, detailed experiments and density functional theory calculations show that Zn sites with a high degree of undercoordination provide even higher activity, in view of their nearly optimal *COOH adsorption energies. These findings showcase Zn‐Oderived particles with plentiful undercoordinated sites as cost‐effective electrocatalysts for CO production.

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Upscaling and continuous operation of electrochemical CO2 to CO conversion in aqueous solutions on silver gas diffusion electrodes

Cited by 173 publications

References 50 publications

Electrochemical Reduction of CO₂: Effect of Convective CO₂ Supply in Gas Diffusion Electrodes

Electrochemical Reduction of CO₂: Effect of Convective CO₂ Supply in Gas Diffusion Electrodes

Metal–Nitrogen–Carbon Electrocatalysts for CO₂ Reduction towards Syngas Generation

The Role of Undercoordinated Sites on Zinc Electrodes for CO₂ Reduction to CO

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Upscaling and continuous operation of electrochemical CO2 to CO conversion in aqueous solutions on silver gas diffusion electrodes

Cited by 173 publications

References 50 publications

Electrochemical Reduction of CO2: Effect of Convective CO2 Supply in Gas Diffusion Electrodes

Electrochemical Reduction of CO2: Effect of Convective CO2 Supply in Gas Diffusion Electrodes

Metal–Nitrogen–Carbon Electrocatalysts for CO2 Reduction towards Syngas Generation

The Role of Undercoordinated Sites on Zinc Electrodes for CO2 Reduction to CO

Contact Info

Product

Resources

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Electrochemical Reduction of CO₂: Effect of Convective CO₂ Supply in Gas Diffusion Electrodes

Electrochemical Reduction of CO₂: Effect of Convective CO₂ Supply in Gas Diffusion Electrodes

Metal–Nitrogen–Carbon Electrocatalysts for CO₂ Reduction towards Syngas Generation

The Role of Undercoordinated Sites on Zinc Electrodes for CO₂ Reduction to CO