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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Electrocatalytic CO2 reduction at intermediate temperatures (100-150 °C) offers kinetic and selectivity advantages.
  • Challenges include membrane-electrode assembly (MEA) fabrication and limited proton (H+)-conductive electrolytes.
  • Previous attempts were hindered by material and assembly difficulties.

Purpose of the Study:

  • To fabricate a novel MEA for gaseous CO2 electrocatalytic reduction at intermediate temperatures.
  • To evaluate the performance of a new proton-conductive electrolyte membrane for CO2 reduction.
  • To assess the impact of temperature on catalytic activity and product selectivity.

Main Methods:

  • Fabrication of a membrane-electrode assembly (MEA) using a [Zn(HPO4)(H2PO4)2](ImH2)2 glass (1g) membrane.
  • Cyclic voltammetry of ferrocene to confirm H+ exchange ability and stability of the 1g membrane in N-methyl-2-pyrrolidone at 120 °C.
  • Testing the MEA performance at various temperatures (30, 80, and 120 °C) for electrocatalytic CO2 reduction.

Main Results:

  • The 1g membrane demonstrated proton (H+) exchange ability and stability at 120 °C.
  • The fabricated MEA exhibited enhanced catalytic activity and reactant selectivity at 120 °C compared to lower temperatures.
  • Over 99% product selectivity for carbon monoxide (CO) was achieved at 80 °C and 120 °C.

Conclusions:

  • The developed MEA with the 1g electrolyte membrane is effective for electrocatalytic CO2 reduction at intermediate temperatures.
  • The study overcomes MEA fabrication and electrolyte limitations for this process.
  • High CO selectivity and activity at 120 °C demonstrate the potential for efficient CO2 conversion.