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This study introduces a novel catalyst for converting carbon dioxide (CO2) to methane (CH4) using renewable energy. The Ir-doped catalyst efficiently uses water for enhanced CO2 reduction, boosting energy storage solutions.

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Area of Science:

  • Electrochemistry
  • Catalysis
  • Materials Science

Background:

  • Electrolytic reduction of carbon dioxide (CO2) to methane (CH4) is key for renewable energy storage.
  • Slow water dissociation kinetics hinder proton supply, limiting CO2 methanation efficiency.
  • The role of water in electrolytes is often overlooked in CO2 conversion.

Purpose of the Study:

  • To develop a novel tandem catalyst for efficient CO2 to CH4 conversion.
  • To investigate the role of water dissociation in the methanation process.
  • To enhance selectivity and activity in multi-electron transfer reactions.

Main Methods:

  • Synthesis of a novel tandem catalyst: Ir single-atom (Ir1)-doped hybrid Cu3N/Cu2O multisite.
  • Experimental characterization of catalyst performance.
  • Theoretical calculations to elucidate reaction mechanisms.

Main Results:

  • The Ir1 facilitates water dissociation, supplying protons for CO2 reduction.
  • The catalyst promotes the *CO protonation pathway toward *CHO.
  • Achieved 75% Faradaic efficiency for CH4 production at 320 mA cm-2 in a flow cell.

Conclusions:

  • The Ir1-doped Cu3N/Cu2O catalyst offers an efficient pathway for CO2 methanation.
  • Facilitating water dissociation is crucial for high-performance CO2 reduction.
  • This work presents a strategy for designing advanced multisite catalysts for energy applications.