Advances and challenges in membrane electrode assembly electrolyzers for CO<sub>2</sub> reduction

Ye, Qingqing; Zhao, Xueyang; Jin, Ruiben; Dong, Fan; Xie, Hongtao; Deng, Bangwei

doi:10.1039/d3ta03757f

Cited by 10 publications

(3 citation statements)

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“…Additionally, it increases resistance for both electron transfer and mass transport. Furthermore, during prolonged eCO 2 RR operation, especially at high current densities, the hydrophobicity of GDEs diminishes, 22 leading to flooding and the eventual detachment of the physically coated powder catalysts from the substrate, in turn, undermining the performance of eCO 2 RR. Moreover, in high-concentration alkaline electrolytes, CO 2 reacts with OH − to form carbonate or bicarbonate, leading to salt precipitation and further reducing the durability of eCO 2 RR.…”

Section: Introductionmentioning

confidence: 99%

Interfacing Dense NiFe@N-Doped Carbon Nanotubes on a Ni Hollow Fiber as a High-Current-Density Gas-Penetrable Electrode for Selective CO₂ Electroreduction

Xia,

Meng,

Zhang

et al. 2024

Energy Fuels

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Despite proven as effective in overcoming the limitations of low CO 2 solubility and inefficient diffusion, traditional gas-diffusion electrodes used in electrocatalytic CO 2 reduction reactions (eCO 2 RR) still face challenges, such as flooding and salt precipitation, and thus exhibit insufficient efficiency and durability at high current densities. Herein, an integrated gas-penetrable electrode (GPE) is developed by interfacially growing dense N-doped carbon nanotubes, embedded with NiFe alloy nanoparticles, on the outer surface of a Ni hollow fiber (NiFe@NCNTs/Ni HF). Thanks to improved mass transfer and the abundance of well-established triphase reaction interfaces, the NiFe@NCNTs/Ni HF GPE exhibits a high CO Faradaic efficiency (FE CO ) of over 90% across a wide potential range of 240 mV. Furthermore, it displays significantly enhanced partial current density (j CO ) of up to 171.7 mA cm −2 at −1.03 V versus reversible hydrogen electrode. Notably, this GPE maintains stable FE CO and j CO values for 42 h. This work demonstrates an effective strategy for developing integrated GPEs for efficient eCO 2 RR by addressing the mass transfer limitation while achieving high efficiency and durability at high current densities.

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Section: Introductionmentioning

confidence: 99%

Interfacing Dense NiFe@N-Doped Carbon Nanotubes on a Ni Hollow Fiber as a High-Current-Density Gas-Penetrable Electrode for Selective CO₂ Electroreduction

Xia,

Meng,

Zhang

et al. 2024

Energy Fuels

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“…19,20 When the water coming from the cross-membrane H 3 O + or ECR is inadequate to dissolve and carry away the alkali salt, the salt precipitation will exacerbate the flooding of the GDE and lead to a decrease of ECR efficiency. 21,22 To further investigate the working mechanism of the modification layer, an anion ionomer of Nafion and a hydrophilic SiO 2 microsphere are employed to fabricate the modification layer for comparison, where the modification layer composed by the mixture of PTFE and Nafion is marked as PTFE-N, the electrode coated by SiO 2 and QAPPT is marked as SiO 2 -Q, and the electrode fabricated by coating the mixed ink of Ag, PTFE and QAPPT on carbon paper is marked as Mix (Fig. S7, ESI †).…”

mentioning

confidence: 99%

mentioning

confidence: 99%

Enhanced CO₂ reduction with hydrophobic cationic-ionomer layer-modified zero-gap MEA in acidic electrolyte

Zhao,

Xie,

Deng

et al. 2024

Chem. Commun.

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Ethylene Electrosynthesis via Selective CO₂ Reduction: Fundamental Considerations, Strategies, and Challenges

O' Carroll,

Yang,

Gordon

et al. 2024

Advanced Energy Materials

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The electrochemical carbon dioxide reduction reaction (CO2RR) is a promising approach for reducing atmospheric carbon dioxide (CO2) emissions, allowing harmful CO2 to be converted into more valuable carbon‐based products. On one hand, single carbon (C1) products have been obtained with high efficiency and show great promise for industrial CO2 capture. However, multi‐carbon (C2+) products possess high market value and have demonstrated significant promise as potential products for CO2RR. Due to CO2RR's multiple pathways with similar equilibrium potentials, the extended reaction mechanisms necessary to form C2+ products continue to reduce the overall selectivity of CO2‐to‐C2+ electroconversion. Meanwhile, CO2RR as a whole faces many challenges relating to system optimization, owing to an intolerance for low surface pH, systemic stability and utilization issues, and a competing side reaction in the form of the H2 evolution reaction (HER). Ethylene (C2H4) remains incredibly valuable within the chemical industry; however, the current established method for producing ethylene (steam cracking) contributes to the emission of CO2 into the atmosphere. Thus, strategies to significantly increase the efficiency of this technology are essential. This review will discuss the vital factors influencing CO2RR in forming C2H4 products and summarize the recent advancements in ethylene electrosynthesis.

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Advances and challenges in membrane electrode assembly electrolyzers for CO₂ reduction

Abstract: Membrane Electrode Assembly (MEA) electrolyzers hold great promise for industrial-scale CO2 reduction (CO2RR) applications, primarily due to their low systemic resistance compared to other electrolyzers. However, there are existing challenges...

Cited by 10 publications

References 112 publications

Interfacing Dense NiFe@N-Doped Carbon Nanotubes on a Ni Hollow Fiber as a High-Current-Density Gas-Penetrable Electrode for Selective CO₂ Electroreduction

Interfacing Dense NiFe@N-Doped Carbon Nanotubes on a Ni Hollow Fiber as a High-Current-Density Gas-Penetrable Electrode for Selective CO₂ Electroreduction

Enhanced CO₂ reduction with hydrophobic cationic-ionomer layer-modified zero-gap MEA in acidic electrolyte

Ethylene Electrosynthesis via Selective CO₂ Reduction: Fundamental Considerations, Strategies, and Challenges

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Advances and challenges in membrane electrode assembly electrolyzers for CO2 reduction

Abstract: Membrane Electrode Assembly (MEA) electrolyzers hold great promise for industrial-scale CO2 reduction (CO2RR) applications, primarily due to their low systemic resistance compared to other electrolyzers. However, there are existing challenges...

Cited by 10 publications

References 112 publications

Interfacing Dense NiFe@N-Doped Carbon Nanotubes on a Ni Hollow Fiber as a High-Current-Density Gas-Penetrable Electrode for Selective CO2 Electroreduction

Interfacing Dense NiFe@N-Doped Carbon Nanotubes on a Ni Hollow Fiber as a High-Current-Density Gas-Penetrable Electrode for Selective CO2 Electroreduction

Enhanced CO2 reduction with hydrophobic cationic-ionomer layer-modified zero-gap MEA in acidic electrolyte

Ethylene Electrosynthesis via Selective CO2 Reduction: Fundamental Considerations, Strategies, and Challenges

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Advances and challenges in membrane electrode assembly electrolyzers for CO₂ reduction

Interfacing Dense NiFe@N-Doped Carbon Nanotubes on a Ni Hollow Fiber as a High-Current-Density Gas-Penetrable Electrode for Selective CO₂ Electroreduction

Interfacing Dense NiFe@N-Doped Carbon Nanotubes on a Ni Hollow Fiber as a High-Current-Density Gas-Penetrable Electrode for Selective CO₂ Electroreduction

Enhanced CO₂ reduction with hydrophobic cationic-ionomer layer-modified zero-gap MEA in acidic electrolyte

Ethylene Electrosynthesis via Selective CO₂ Reduction: Fundamental Considerations, Strategies, and Challenges