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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Gray mesoporous SnO2 catalyst for CO2 electroreduction with high partial current density and formate selectivity.

Mabrook S Amer1, Haneen A AlOraij1, Kuo-Wei Huang2

  • 1Electrochemical Sciences Research Chair (ESRC), Chemistry Department, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia.

Environmental Research
|April 15, 2024
PubMed
Summary

We developed mesoporous gray tin dioxide (SnO2) electrocatalysts for efficient electrochemical CO2 reduction. These catalysts show high activity and selectivity for formate production, offering a promising solution for CO2 conversion.

Keywords:
Active sitesBlock copolymerCO(2) reduction reactionMesoporous SnO(2)Oxygen vacancy

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Mesoporous metal oxide semiconductors possess unique properties beneficial for catalysis and energy applications.
  • Electrochemical CO2 reduction (eCO2RR) is a key technology for converting CO2 into valuable chemicals.

Purpose of the Study:

  • To fabricate mesoporous gray SnO2 (MGS) electrocatalysts using an evaporation-induced co-assembly (EICA) method.
  • To investigate the performance of MGS in electrochemical CO2 reduction.

Main Methods:

  • Utilized Pluronic P123 as a template for EICA.
  • Employed carbon-based thermal treatment to create MGS with active sites and oxygen vacancies.
  • Tested MGS in a flow cell for eCO2RR.

Main Results:

  • Achieved high catalytic activity and selectivity towards formate.
  • Demonstrated a partial current density of -234 mA cm⁻² and Faradaic efficiency (FE) of 93.60% at -1.3 V vs. RHE.
  • MS-1.5@350N-400A electrode showed 98% FE at -0.6 V RHE and stable FE (96±1%) from -0.6 to -1.2 V RHE due to high surface area and active sites.

Conclusions:

  • The developed MGS electrocatalysts exhibit excellent performance for eCO2RR.
  • The high surface area, active sites, and oxygen vacancies contribute to the superior catalytic activity and stability.
  • This work presents a promising approach for efficient CO2 conversion into formate.