Acidic CO<sub>2</sub> electroreduction for high CO<sub>2</sub> utilization: catalysts, electrodes, and electrolyzers

Lee, Taemin; Lee, Yujin; Eo, Jungsu; Nam, Dae-Hyun

doi:10.1039/d3nr05480b

Nanoscale

2024

DOI: 10.1039/d3nr05480b

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Acidic CO₂ electroreduction for high CO₂ utilization: catalysts, electrodes, and electrolyzers

Taemin Lee,

Yujin Lee,

Jungsu Eo

et al.

Abstract: The electrochemical carbon dioxide (CO2) reduction reaction (CO2RR) is considered a promising technology for converting atmospheric CO2 into value-added compounds by utilizing renewable energy. The CO2RR has developed in various...

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Cited by 10 publications

References 138 publications

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Atomically Dispersed Scandium in Cuprous Oxide Weakens ^*CO Adsorption to Boost Carbon Dioxide Electroreduction Toward C₂ Products

Chen,

Jiang,

Zhu

et al. 2024

Adv Funct Materials

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Copper (Cu) is a promising metal for electrochemical CO2 reduction reaction (eCO2RR) to value‐added C2 products. However, as the key intermediate for C─C coupling to form C2 products, *CO intermediate is difficult to adsorb on the Cu surface on a moderate level. Rare earth elements possess a distinctive electronic structure that effectively regulates the local density of surrounding atoms, yet has rarely been investigated. Herein, different rare earth metals are screened doping Cu2O and found that Sc atomically dispersed Cu2O can weaken the CO adsorption on the catalyst surface and lower the energy barrier of the C─C coupling step through in situ ATR‐SEIRAS and DFT calculations. Therefore, the as‐prepared Sc0.09‐Cu2O catalyst presents improved eCO2RR to C2 product performance with a faradic efficiency of 71.9% at a current density of 600 mA cm−2.

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Atomically Dispersed Scandium in Cuprous Oxide Weakens ^*CO Adsorption to Boost Carbon Dioxide Electroreduction Toward C₂ Products

Chen,

Jiang,

Zhu

et al. 2024

Adv Funct Materials

View full text Add to dashboard Cite

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Addressing the Carbonate Issue: Electrocatalysts for Acidic CO₂ Reduction Reaction

Wu,

Xu,

et al. 2024

Advanced Materials

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Electrochemical CO2 reduction reaction (CO2RR) powered by renewable energy provides a promising route to CO2 conversion and utilization. However, the widely used neutral/alkaline electrolyte consumes a large amount of CO2 to produce (bi)carbonate byproducts, leading to significant challenges at the device level, thereby impeding the further deployment of this reaction. Conducting CO2RR in acidic electrolytes offers a promising solution to address the “carbonate issue”; however, it presents inherent difficulties due to the competitive hydrogen evolution reaction, necessitating concerted efforts towards advanced catalyst and electrode designs to achieve high selectivity and activity. This review encompasses recent developments of acidic CO2RR, from mechanism elucidation to catalyst design and device engineering. We begin by discussing the mechanistic understanding of the reaction pathway, laying the foundation for catalyst design in acidic CO2RR. Subsequently, we provide an in‐depth analysis of recent advancements in acidic CO2RR catalysts, highlighting heterogeneous catalysts, surface immobilized molecular catalysts and catalyst surface enhancement. Furthermore, we summarize the progress made in device‐level applications, aiming to develop high‐performance acidic CO2RR systems. Finally, we outline the existing challenges and future directions in the design of acidic CO2RR catalysts, emphasizing the need for improved selectivity, activity, stability, and scalability.This article is protected by copyright. All rights reserved

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Cation‐Infused Bilayer Ionomer Coating Enables High Partial Current Density Toward Multi Carbon Products in CO₂ Electrolysis

Rashid,

Nabil,

Adnan

et al. 2024

Advanced Energy Materials

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Electrochemical CO2 reduction (eCO2R) stands as a pivotal technology for carbon recycling by converting CO2 into value‐added products. While significant strides have been made in generating multi‐carbon (C2+) products like ethylene (C2H4) and ethanol (C2H5OH) at industrial‐scale current densities with high Faradaic efficiency (FE), cathode flooding and (bi)carbonate salt accumulation remain a fundamental concern in an alkaline electrolyte. In this work, ion‐conducting polymers are used to tailor the micro‐environment mitigating cathode flooding and salt precipitation and thus, enhancing the local CO2 availability. The impact of cation and anion exchange ionomer layers, specifically Nafion and Sustainion XA‐9 are examined on overall eCO2R performance. The use of an ultra‐thin bilayer configuration significantly reduces cathode flooding and salt accumulation by ≈58% compared to commercial anion exchange membrane (AEM). Alongside, cation infusion improves the C─C bond formation inducing a favorable micro‐environment for selective C2+ formation. This cation‐infused bilayer ionomer (CIBLI) achieves a high partial current density of ≈284 mA cm−2 toward C2+ products maintaining a stable eCO2R performance for 24 hours (h). This scalable approach of directly deposited ultra‐thin CIBLI offers a minimal conversion energy of 117 GJ/ ton C2+ products with an energy efficiency (EE) of 29% at 350 mA cm−2 current density in one‐step CO2 conversion.

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Acidic CO₂ electroreduction for high CO₂ utilization: catalysts, electrodes, and electrolyzers

Abstract: The electrochemical carbon dioxide (CO2) reduction reaction (CO2RR) is considered a promising technology for converting atmospheric CO2 into value-added compounds by utilizing renewable energy. The CO2RR has developed in various...

Cited by 10 publications

References 138 publications

Atomically Dispersed Scandium in Cuprous Oxide Weakens ^*CO Adsorption to Boost Carbon Dioxide Electroreduction Toward C₂ Products

Atomically Dispersed Scandium in Cuprous Oxide Weakens ^*CO Adsorption to Boost Carbon Dioxide Electroreduction Toward C₂ Products

Addressing the Carbonate Issue: Electrocatalysts for Acidic CO₂ Reduction Reaction

Cation‐Infused Bilayer Ionomer Coating Enables High Partial Current Density Toward Multi Carbon Products in CO₂ Electrolysis

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Acidic CO2 electroreduction for high CO2 utilization: catalysts, electrodes, and electrolyzers

Abstract: The electrochemical carbon dioxide (CO2) reduction reaction (CO2RR) is considered a promising technology for converting atmospheric CO2 into value-added compounds by utilizing renewable energy. The CO2RR has developed in various...

Cited by 10 publications

References 138 publications

Atomically Dispersed Scandium in Cuprous Oxide Weakens *CO Adsorption to Boost Carbon Dioxide Electroreduction Toward C2 Products

Atomically Dispersed Scandium in Cuprous Oxide Weakens *CO Adsorption to Boost Carbon Dioxide Electroreduction Toward C2 Products

Addressing the Carbonate Issue: Electrocatalysts for Acidic CO2 Reduction Reaction

Cation‐Infused Bilayer Ionomer Coating Enables High Partial Current Density Toward Multi Carbon Products in CO2 Electrolysis

Contact Info

Product

Resources

About

Acidic CO₂ electroreduction for high CO₂ utilization: catalysts, electrodes, and electrolyzers

Atomically Dispersed Scandium in Cuprous Oxide Weakens ^*CO Adsorption to Boost Carbon Dioxide Electroreduction Toward C₂ Products

Atomically Dispersed Scandium in Cuprous Oxide Weakens ^*CO Adsorption to Boost Carbon Dioxide Electroreduction Toward C₂ Products

Addressing the Carbonate Issue: Electrocatalysts for Acidic CO₂ Reduction Reaction

Cation‐Infused Bilayer Ionomer Coating Enables High Partial Current Density Toward Multi Carbon Products in CO₂ Electrolysis