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<p>Electrochemical reduction reaction of CO<sub>2</sub> (CO<sub>2</sub>RR) to C<sub>1</sub> and C<sub>2</sub> products can be achieved on Cu-based electrocatalysts. C<sub>2</sub> products exhibit higher energy density and economic value compared to C<sub>1</sub> products, making them more desirable as reduction products. However, the production of C<sub>2</sub> products on pure Cu catalysts involves multi-step proton-coupled electron transfer and C–C coupling steps, which are kinetically slow and result in poor catalytic activity and selectivity for the products. The cavity nanocubes Cu<sub>2</sub>O(0.13-AA), Cu<sub>2</sub>O(0.10-AA) and Cu<sub>2</sub>O(0.15-AA) catalysts were synthesized via wet chemical reduction by adjusting the concentration of the reducing agent. The electrochemical pre-reduction method was used to obtain Cu<sub>2</sub>O/Cu(0.13-AA), Cu<sub>2</sub>O/Cu(0.10-AA) and Cu<sub>2</sub>O/Cu(0.15-AA) catalysts for CO<sub>2</sub>RR. Cu<sub>2</sub>O/Cu(0.13&#xa0;M-AA) catalyst achieves the high Faradaic efficiency (FE) of 39.98% for C<sub>2</sub>H<sub>4</sub> and 54.76% for C<sub>2</sub> products (C<sub>2</sub>H<sub>4</sub>, C<sub>2</sub>H<sub>6</sub>, and C<sub>2</sub>H<sub>5</sub>OH), with significant inhibition of the hydrogen evolution reaction. In situ Raman experiments demonstrate that the cavity structure of the nanocubes enhances the local concentration of *CO intermediates, thereby promoting the C–C coupling process and improving the selectivity of CO<sub>2</sub> reduction to C<sub>2</sub> products.</p>

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Potential-induced synthesis of cavity Cu2O/Cu nanocubes for enhanced electroreduced CO2 to C2+ products

  • 期刊论文

  • 发表日期：

    2025年10月3日

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  • Yaping Hu,
  • Shasha Zhai,
  • Yaping Guo,
  • Shan Dang,
  • Jing Li,
  • Miao Yang

摘要

Electrochemical reduction reaction of CO2 (CO2RR) to C1 and C2 products can be achieved on Cu-based electrocatalysts. C2 products exhibit higher energy density and economic value compared to C1 products, making them more desirable as reduction products. However, the production of C2 products on pure Cu catalysts involves multi-step proton-coupled electron transfer and C–C coupling steps, which are kinetically slow and result in poor catalytic activity and selectivity for the products. The cavity nanocubes Cu2O(0.13-AA), Cu2O(0.10-AA) and Cu2O(0.15-AA) catalysts were synthesized via wet chemical reduction by adjusting the concentration of the reducing agent. The electrochemical pre-reduction method was used to obtain Cu2O/Cu(0.13-AA), Cu2O/Cu(0.10-AA) and Cu2O/Cu(0.15-AA) catalysts for CO2RR. Cu2O/Cu(0.13 M-AA) catalyst achieves the high Faradaic efficiency (FE) of 39.98% for C2H4 and 54.76% for C2 products (C2H4, C2H6, and C2H5OH), with significant inhibition of the hydrogen evolution reaction. In situ Raman experiments demonstrate that the cavity structure of the nanocubes enhances the local concentration of *CO intermediates, thereby promoting the C–C coupling process and improving the selectivity of CO2 reduction to C2 products.