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Constructing a Localized Buffer Interlayer to Elevate High-Rate CO2-to-C2+ Electrosynthesis.

Guobin Wen1,2, Bohua Ren1,2, Xin Wang1,3

  • 1Institute of Carbon Neutrality, Zhejiang Wanli University, Ningbo 315100, China.

Journal of the American Chemical Society
|May 13, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel buffer interlayer using ionic liquids (ILs) to enhance the electrosynthesis of multicarbon chemicals from carbon dioxide (CO2). This strategy improves CO2 utilization and boosts C2+ production rates, demonstrating a scalable solution for CO2 conversion.

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Area of Science:

  • Electrochemistry
  • Catalysis
  • Materials Science
  • Chemical Engineering

Background:

  • Electrosynthesis of multicarbon chemicals from CO2 is crucial for carbon utilization.
  • Controlling mass transport of CO2 and intermediate CO is a key challenge for C2+ production.
  • Existing catalytic surface engineering often overlooks selective mass transport regulation.

Purpose of the Study:

  • To address the limitations in CO2 electrosynthesis by exploring selective mass transport regulation.
  • To develop a strategy for enhancing the production rate of C2+ chemicals.
  • To stabilize catalytic sites during the electrosynthesis process.

Main Methods:

  • Strategic construction of a buffer interlayer with soluble ionic liquid (IL) additives.
  • Integration of the buffer interlayer between the aqueous electrolyte and catalytic surface.
  • Utilizing a flow-through compact cell for enhanced CO2 and CO transport.
  • Employing Cu2O-derived Cu as catalytic sites stabilized by ILs.

Main Results:

  • The buffer interlayer effectively regulated the microenvironment for CO2 and CO.
  • Extended CO residence time in the interlayer due to attractive interactions.
  • Enhanced CO2 transport via buffer reactions in the aqueous interlayer.
  • Stabilization of active Cu sites by facilitating Cu2O regeneration.
  • Achieved high C2+ product synthesis rate with a partial current density of 1.30 A/cm2 for over 200 h.
  • Demonstrated scalability to a 100 cm2 flow cell with <6% carbon loss.

Conclusions:

  • The developed buffer interlayer strategy significantly enhances CO2 electrosynthesis efficiency and C2+ production rates.
  • Ionic liquids play a vital role in regulating interfacial mass transport and stabilizing catalytic sites.
  • This work establishes a generalizable framework for designing buffer interlayers and catalytic systems for CO2 electrolysis.