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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Published on: April 10, 2018

Acidic-alkaline tandem system for durable CO2-CO-C2.

Xianhui Ma1,2, Juan Zhang3, Dayin He1,2

  • 1Key Laboratory of Precision and Intelligent Chemistry/School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China.

Science Advances
|May 13, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a novel acidic-alkaline tandem system for efficient carbon dioxide reduction reaction (CO2RR) to ethylene and other valuable multicarbon products. The new system demonstrates high product selectivity and long-term stability, overcoming limitations of previous methods.

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Area of Science:

  • Electrochemistry
  • Catalysis
  • Materials Science

Background:

  • Tandem carbon dioxide reduction reaction (CO2RR) to multicarbon products (C2+) is crucial for carbon valorization.
  • Conventional alkaline or neutral systems suffer from limited CO2 utilization and stability due to (bi)carbonate formation.

Purpose of the Study:

  • To design a durable acidic-alkaline tandem system for efficient synthesis of C2+ products, particularly ethylene.
  • To overcome the limitations of conventional CO2RR systems.

Main Methods:

  • Developed a catalyst with controlled metal site distance for the acidic CO2RR step to regulate *COOH adsorption.
  • Integrated this catalyst into an acidic-alkaline tandem system coupled with alkaline carbon monoxide electroreduction.

Main Results:

  • Achieved 99.7% Faradaic efficiency for carbon monoxide in the acidic step using a catalyst with 0.5 nm nickel sites.
  • Attained 75.3% ethylene and 92.5% C2+ Faradaic efficiency at 10 A in the tandem system.
  • Demonstrated stability for 400 hours.

Conclusions:

  • The designed acidic-alkaline tandem system efficiently converts CO2 to C2+ products with high selectivity and durability.
  • This work offers solutions for catalyst and electrolyzer design for sustainable CO2 conversion.