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<p>Electrochemical CO<sub>2</sub> reduction reaction (CO<sub>2</sub>RR) is a promising technique to address the excess CO<sub>2</sub> emissions for closing the global carbon cycle. However, challenges remain to break the trade-off between high Faradaic efficiencies and high current densities. Herein, we synthesize Ag nano-foams (Ag NFs) featuring sufficient gas channels by a facile wet-chemical method. It is revealed that the gaseous products can be rapidly released from Ag NFs with the presence of nanochannels, profiting from the exposure of active sites and their further access to CO<sub>2</sub>. COMSOL simulation verifies the uniform distribution of low-pressure drop and thus promotes local mass transfer within the catalyst layers. Benefiting from the improved transport features, the Ag NFs achieve excellent CO Faradaic efficiencies (FE<sub>CO</sub> &gt; 90.9%) in a wide potential window (−0.5<i>V</i><sub>RHE</sub>-−1.2<i>V</i><sub>RHE</sub>), together with a high partial current density of 365.7 mA cm<sup>−2</sup> at −1.2<i>V</i><sub>RHE</sub>. This study provides insights into the rational regulation of gas and electrons within electrocatalysts for efficient CO<sub>2</sub>-to-gas conversion.</p>

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Nano-scale gas channels in Ag electrocatalysts promoting the efficient CO2-to-CO conversion over a wide potential window

  • 期刊论文

  • 发表日期：

    2025年5月28日

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  • Ya Liu,
  • Yicheng Li,
  • Guoyu Hou,
  • Xingqiu Li,
  • Zhen Zheng,
  • Yujie Zhou,
  • Bo Liu,
  • Qiang Yang,
  • Yu Zhang

摘要

Electrochemical CO2 reduction reaction (CO2RR) is a promising technique to address the excess CO2 emissions for closing the global carbon cycle. However, challenges remain to break the trade-off between high Faradaic efficiencies and high current densities. Herein, we synthesize Ag nano-foams (Ag NFs) featuring sufficient gas channels by a facile wet-chemical method. It is revealed that the gaseous products can be rapidly released from Ag NFs with the presence of nanochannels, profiting from the exposure of active sites and their further access to CO2. COMSOL simulation verifies the uniform distribution of low-pressure drop and thus promotes local mass transfer within the catalyst layers. Benefiting from the improved transport features, the Ag NFs achieve excellent CO Faradaic efficiencies (FECO > 90.9%) in a wide potential window (−0.5VRHE-−1.2VRHE), together with a high partial current density of 365.7 mA cm−2 at −1.2VRHE. This study provides insights into the rational regulation of gas and electrons within electrocatalysts for efficient CO2-to-gas conversion.