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Updated: Jan 23, 2026

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Triple-phase interfaces for electrochemical reduction of carbon dioxide.

Yihan Xu1, Tianxiang Yan1, Xiangrui Zhang2

  • 1Key Laboratory for Green Chemical Technology of Ministry of Education, Collaborative Innovation Centre of Chemical Science and Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China. sheng.zhang@tju.edu.cn.

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The CO2 electroreduction reaction (CO2RR) converts CO2 into valuable products, storing renewable energy. This review re-examines triple-phase interface (TPI) dynamics and optimization for improved CO2RR performance.

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Area of Science:

  • Electrocatalysis
  • Sustainable Energy Conversion
  • Materials Science

Background:

  • The CO2 electroreduction reaction (CO2RR) is crucial for converting CO2 into valuable products, aiding renewable energy storage and CO2 emission mitigation.
  • CO2RR performance is limited by complex dynamics at gas-liquid-solid triple-phase interfaces (TPIs), facing challenges like wetting and hydrophobic layer degradation.

Purpose of the Study:

  • To re-examine TPI paradigms in CO2RR by integrating static models with dynamic experimental findings.
  • To provide a comprehensive framework for optimizing TPIs and advancing sustainable electrocatalysis for clean energy technologies.

Main Methods:

  • Review and integration of early static TPI models with recent dynamic experimental insights.
  • Systematic review of TPI optimization strategies, including porous architectures, hydrophobic modifications, and heterostructure engineering.
  • Analysis of TPI failure modes and extension of concepts to other electrochemical reactions (oxygen reduction, hydrogen evolution/oxidation).

Main Results:

  • Identified key challenges hindering practical CO2RR performance related to TPI dynamics.
  • Reviewed and analyzed various strategies for TPI optimization in CO2RR.
  • Extracted universal principles for catalyst design applicable across multiple electrochemical reactions.

Conclusions:

  • Understanding and optimizing TPIs is critical for advancing CO2RR and other electrochemical reactions.
  • In situ/operando characterization techniques are essential for bridging macroscopic design and atomic-scale interfacial dynamics.
  • This review provides a framework for future catalyst design in sustainable electrocatalysis and clean energy applications.