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Orthogonal relay system for efficient CO-to-ethanol electrosynthesis.

Senlin Chu1, Yanpu Niu2, Libin Zeng1,3

  • 1Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, China.

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|June 3, 2026
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Summary
This summary is machine-generated.

This study introduces a novel catalytic mechanism for efficient electrosynthesis of ethanol from carbon monoxide (CO). The approach enhances selectivity and energy efficiency, paving the way for sustainable fuel production.

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Area of Science:

  • Electrochemistry
  • Catalysis
  • Materials Science

Background:

  • Electrosynthesis of ethanol from carbon monoxide (CO) offers a sustainable route to low-carbon fuels.
  • Current methods suffer from low selectivity, primarily producing ethylene instead of ethanol.
  • Understanding reaction mechanisms is crucial for improving catalyst performance.

Purpose of the Study:

  • To develop a highly selective and efficient electrocatalytic process for converting CO to ethanol.
  • To elucidate the underlying catalytic mechanism for enhanced ethanol production.
  • To demonstrate the practical applicability of the developed system in a membrane electrode assembly (MEA) electrolyzer.

Main Methods:

  • Utilized atomic doping with lead to electronically tune copper (Cu) catalysts.
  • Engineered an interfacial ionomer-catalyst heterojunction (IICH) to stabilize key intermediates.
  • Employed flow cell and membrane electrode assembly (MEA) electrolyzer configurations for performance evaluation.

Main Results:

  • Achieved a 71.5% Faradaic efficiency for CO-to-ethanol conversion.
  • Demonstrated a 28.1% energy efficiency with 300 hours of stable operation in an MEA electrolyzer.
  • Scaled operation at 100 cm² yielded a total current of 15 A and 39.8 mmol h⁻¹ ethanol productivity.

Conclusions:

  • The orthogonal relay catalysis mechanism effectively lowers the hydrogenation barrier and suppresses C-O cleavage.
  • Atomic doping and IICH are key to achieving high selectivity and efficiency in ethanol electrosynthesis.
  • The developed system shows significant potential for practical, large-scale applications in sustainable fuel production.