Visualisation and quantification of flooding phenomena in gas diffusion electrodes used for electrochemical <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si9.svg"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CO</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math> reduction: A combined EDX/ICP–MS approach

Kong, Ying; Hu, Huifang; Liu, Menglong; Hou, Yuhui; Kolivoška, Viliam; Vesztergom, Soma; Broekmann, Peter

doi:10.1016/j.jcat.2022.02.014

Cited by 37 publications

(21 citation statements)

References 43 publications

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“…S34, ESI†) after electrolysis for 6 h at 1600 mA cm −2 showed that the morphology of CLs did not significantly vary, and most of the MPL was flooded in a similar manner to that described in previous reports. 53,54 The recycling test was also conducted. Fig.…”

Section: Resultsmentioning

confidence: 99%

Ultra-high-rate CO₂ reduction reactions to multicarbon products with a current density of 1.7 A cm⁻² in neutral electrolytes

et al. 2023

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Section: Resultsmentioning

confidence: 99%

Ultra-high-rate CO₂ reduction reactions to multicarbon products with a current density of 1.7 A cm⁻² in neutral electrolytes

et al. 2023

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“…The electrolyte solution penetrating into GDE substantially slow down CO 2 diffusion to the active catalytic sites in MPL, thus, hindering CO 2 RR consequently promoting HER. [23] On the other hand, the flooding of GDE induces the formation of (bi)carbonate at the three-boundary GDE interface. Because of the limited solubility of potassium (bi)carbonate (lower than the solubility of KOH), the salt precipitates and also leads to blocking of CO 2 RR active sites.…”

Section: Co 2 Electrolysis: Loss Of Co 2 Rr Performancementioning

confidence: 99%

“…The rapid loss in CO 2 RR performance has been found to be associated primarily with potassium (bi)carbonate precipitation on the GDE. [2,3,[21][22][23] The (bi)carbonate precipitation is caused by increased local alkalinity leading to an undesirable reaction of CO 2 with hydroxide ions. Several processes induce an increase in local pH.…”

Section: Co 2 Electrolysis: Loss Of Co 2 Rr Performancementioning

confidence: 99%

“…[2] In the latter case, the investigation of catalyst degradation has been hindered by the precipitation of (bi)carbonate salt at a three-phase GDE interface within several or few tens of minutes, thus severely suppressing CO 2 RR. [2,3,[21][22][23] Nevertheless, the study of NP-catalyst structural changes during CO 2 RR in a zero-gap electrolyzer under harsh conditions (high current densities) is extremely important, because NP degradation is crucial for CO 2 RR performance on the long-term electrolysis time scale.…”

Section: Introductionmentioning

confidence: 99%

“…Here, continuing our investigation of the degradation behavior of Ag NP catalysts, we focused on the effect of NP size on structural changes during CO 2 RR in a zero-gap electrolyzer (the corresponding configuration has been described in detail in Refs. [3,23], Figure S1). Catalyst inks were prepared from commercially available PVP-capped 10, 40, and 100 nm Ag NPs.…”

Section: Introductionmentioning

confidence: 99%

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Size‐Dependent Structural Alterations in Ag Nanoparticles during CO₂ Electrolysis in a Gas‐Fed Zero‐Gap Electrolyzer

Liu

Kong

et al. 2022

ChemElectroChem

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Ag nanoparticles (NPs) are efficient electrocatalysts for electrochemical CO2‐to‐CO conversion. However, NPs are thermodynamically unstable and can undergo structural alterations under electrolysis operating conditions. These structural changes may play a crucial role in the deterioration of CO2 reduction reaction (CO2RR) performance on the long‐term electrolysis time scale. Here, we studied the effect of NP size on NP degradation during CO2RR. Polyvinylpyrrolidone‐capped 10, 40, and 100 nm Ag NPs deposited on a gas diffusion electrode were used as testbed catalysts in a gas‐fed zero‐gap electrolyzer. Inductively coupled plasma mass spectrometry indicated insignificant catalyst‐material detachment after galvanostatic CO2 electrolysis. Scanning electron microscopy analysis showed that smaller NPs tended to agglomerate during CO2 electrolysis. 100 nm NPs formed agglomerates consisting of only two‐three NPs and underwent pronounced fragmentation with the formation of particles several nanometers in size. The fragmentation was associated with cathodic corrosion of Ag NPs under conditions of intensive CO2RR and hydrogen evolution.

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Advances and Challenges of Carbon‐Free Gas‐Diffusion Electrodes (GDEs) for Electrochemical CO₂ Reduction

Rabiee,

Ma,

Yang

et al. 2024

Adv Funct Materials

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Electrochemical CO2 reduction reaction (CO2RR) coupled with renewable electricity holds promises for efficient mitigation of carbon emission impacts on the environment and turning CO2 into valuable chemicals. One important task in CO2RR development is the design and fabrication of efficient electrodes for stable operation in the long term. Gas‐diffusion electrodes (GDEs) have been employed to continuously feed CO2 to the electrolyzers. Despite significant advances in GDE design and tailoring GDE properties, the present GDEs often suffer from the critical issue of flooding due to the electrowetting of carbon‐based substrates, which hinders the transition to industrial application. To address flooding, GDEs with intrinsically hydrophobic polymeric substrates have been recently fabricated and have shown promising performances. Herein, the advances and challenges associated with carbon‐free GDEs are reviewed for CO2RR. This review first briefly outlines GDE and electrolyzers basics. Through critical discussion around the shortcomings of conventional carbon‐based GDEs, the most recent efforts to resolve flooding are summarized. Subsequently, the advances, advantages, and challenges of carbon‐free GDEs are elaborated. Finally, priorities for future studies are suggested, with the aim to support the advancement and scale‐up of carbon‐free GDEs and extend them to other electrochemical systems where gas and the electrolyte are in contact.

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Visualisation and quantification of flooding phenomena in gas diffusion electrodes used for electrochemical CO2 reduction: A combined EDX/ICP–MS approach

Cited by 37 publications

References 43 publications

Ultra-high-rate CO₂ reduction reactions to multicarbon products with a current density of 1.7 A cm⁻² in neutral electrolytes

Ultra-high-rate CO₂ reduction reactions to multicarbon products with a current density of 1.7 A cm⁻² in neutral electrolytes

Size‐Dependent Structural Alterations in Ag Nanoparticles during CO₂ Electrolysis in a Gas‐Fed Zero‐Gap Electrolyzer

Advances and Challenges of Carbon‐Free Gas‐Diffusion Electrodes (GDEs) for Electrochemical CO₂ Reduction

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Visualisation and quantification of flooding phenomena in gas diffusion electrodes used for electrochemical CO2 reduction: A combined EDX/ICP–MS approach

Cited by 37 publications

References 43 publications

Ultra-high-rate CO2 reduction reactions to multicarbon products with a current density of 1.7 A cm−2 in neutral electrolytes

Ultra-high-rate CO2 reduction reactions to multicarbon products with a current density of 1.7 A cm−2 in neutral electrolytes

Size‐Dependent Structural Alterations in Ag Nanoparticles during CO2 Electrolysis in a Gas‐Fed Zero‐Gap Electrolyzer

Advances and Challenges of Carbon‐Free Gas‐Diffusion Electrodes (GDEs) for Electrochemical CO2 Reduction

Contact Info

Product

Resources

About

Ultra-high-rate CO₂ reduction reactions to multicarbon products with a current density of 1.7 A cm⁻² in neutral electrolytes

Ultra-high-rate CO₂ reduction reactions to multicarbon products with a current density of 1.7 A cm⁻² in neutral electrolytes

Size‐Dependent Structural Alterations in Ag Nanoparticles during CO₂ Electrolysis in a Gas‐Fed Zero‐Gap Electrolyzer

Advances and Challenges of Carbon‐Free Gas‐Diffusion Electrodes (GDEs) for Electrochemical CO₂ Reduction