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<p>The conversion of CO<sub>2</sub> and CO using electricity offers a promising, sustainable approach to achieve valuable products. Although CO electroreduction to C<sub>1</sub> and C<sub>2</sub> products has seen rapid progress in efficiency and production rate, C<sub>3</sub> synthesis remains a major challenge. Here we show that C<sub>3</sub> products lie along the ethylene pathway by using a probe reactant and isotope-labelled CO. We find that glyoxal addition promotes C<sub>3</sub> formation while suppressing acetate/ethanol production, while itself scarcely being consumed. Spectroscopy reveals lower CO* coverage in the presence of glyoxal. Reaction-order experiments show higher coverages of CO* and of OH<sup>−</sup> species linked to suppressing ethylene in favour of C<sub>3</sub>. By combining both strategies to suppress ethylene formation with an abundance of OH<sup>−</sup> and blocking acetate/ethanol formation with glyoxal, we report a high selectivity for C<sub>3</sub> products, including a 53% Faradaic efficiency. These insights aid the design of future catalysts for C<sub>3</sub> production.</p><p></p>

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Co-electroreduction of CO and glyoxal promotes C3 products

  • 期刊论文

  • 发表日期：

    2025年11月4日

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  • Roham Dorakhan,
  • Shreya Sarkar,
  • Erfan Shirzadi,
  • Hafiz Ghulam Abbas,
  • Ali Shayesteh,
  • Sungjin Park,
  • Jianan Erick Huang,
  • David Sinton,
  • Edward H. Sargent

摘要

The conversion of CO2 and CO using electricity offers a promising, sustainable approach to achieve valuable products. Although CO electroreduction to C1 and C2 products has seen rapid progress in efficiency and production rate, C3 synthesis remains a major challenge. Here we show that C3 products lie along the ethylene pathway by using a probe reactant and isotope-labelled CO. We find that glyoxal addition promotes C3 formation while suppressing acetate/ethanol production, while itself scarcely being consumed. Spectroscopy reveals lower CO* coverage in the presence of glyoxal. Reaction-order experiments show higher coverages of CO* and of OH− species linked to suppressing ethylene in favour of C3. By combining both strategies to suppress ethylene formation with an abundance of OH− and blocking acetate/ethanol formation with glyoxal, we report a high selectivity for C3 products, including a 53% Faradaic efficiency. These insights aid the design of future catalysts for C3 production.