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Defect engineered SnO2 nanoparticles enable strong CO2 chemisorption toward efficient electroconversion to formate.

Baoxing Ning1, Miaomiao Liu1, Yanjie Hu1

  • 1Key Laboratory for Ultrafine Materials of Ministry of Education, Frontiers Science Center for Materiobiology and Dynamic Chemistry, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China. jianghao@ecust.edu.cn.

Dalton Transactions (Cambridge, England : 2003)
|February 10, 2022
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Summary

Oxygen vacancy engineering in tin dioxide (SnO2) electrocatalysts enhances carbon dioxide electroreduction (CO2RR) to formate. This strategy achieves high efficiency and conductivity, paving the way for advanced oxide electrocatalysts.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Tin dioxide (SnO2) is a promising material for CO2 electroreduction (CO2RR).
  • Oxygen vacancies (Ov) are critical for enhancing SnO2 performance in CO2RR.
  • Optimizing Ov content is key to improving catalytic activity and efficiency.

Purpose of the Study:

  • To rationally synthesize SnO2 nanoparticle electrocatalysts with precisely engineered oxygen vacancy (Ov) content.
  • To investigate the impact of ultrahigh Ov content on the electrochemical performance of SnO2 for CO2RR.
  • To demonstrate a viable strategy for designing high-activity oxide-based electrocatalysts.

Main Methods:

  • Thermally induced strategy for synthesizing highly dispersed SnO2 nanoparticles.
  • Characterization of Ov content, reaching up to 25.1%.
  • Electrochemical testing in a flow cell to evaluate CO2 electroreduction to formate.

Main Results:

  • Achieved ultrahigh Ov content (up to 25.1%) in SnO2 nanoparticles.
  • Demonstrated significantly improved intrinsic conductivity and CO2 chemisorption capacity.
  • Obtained high Faraday efficiency (FE) of ~90% and cathodic energy efficiency >60% for formate production.
  • Reached a commercially relevant current density of 200 mA cm-2 at 2.8 V in a full cell.

Conclusions:

  • Oxygen vacancy engineering is a powerful strategy for enhancing SnO2 electrocatalyst performance in CO2RR.
  • The developed thermally induced method enables the rational synthesis of high-activity oxide electrocatalysts.
  • This approach shows potential for designing efficient electrocatalysts for CO2 conversion into valuable chemicals like formate.