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<p>To realize industrially feasible CO<sub>2</sub> conversion, it is particularly important to achieve efficient catalysis in large-area electrocatalytic CO<sub>2</sub> reduction (CO<sub>2</sub>RR) electrolyzers. However, the flooding and salt precipitation within electrolyzers make this extremely challenging. Currently, hydrophobic Teflonated carbon papers (TCPs) are widely used in CO<sub>2</sub>RR electrolyzers. However, the use of TCP can lead to poor electrode conductivity, catalyst agglomeration, and detachment, thereby reducing the catalytic performance of the electrolyzers. This paper describes the design and construction of a three-dimensional hydrophobic catalytic structure by modifying hydrophilic raw carbon paper with tetrafluorooctyltriethoxysilane and spraying Ag catalyst. By analyzing the catalytic performance, surface ion concentration, and salt precipitation distribution of the electrode, the optimization effect of the three-dimensional hydrophobic catalytic structure on the three-phase interface is elucidated. The results show that the three-dimensional catalytic structure effectively increases the catalytic area, reduces the penetration of electrolyte into the electrode, and reduces salt precipitation. Meanwhile, the three-dimensional catalytic structure facilitates efficient charge transfer and regulates the H<sub>2</sub>O and CO<sub>2</sub> concentrations around the catalysts. After operating at a current density of 200 mA/cm<sup>2</sup> for 100 h in KOH solution, the Faraday efficiency of CO remains above 88%, with a cell voltage of approximately 3 V.</p>

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The three-dimensional hydrophobic catalytic structure for CO2 electroreduction mitigates electrode salt precipitation

  • 期刊论文

  • 发表日期：

    2026年2月4日

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  • Peipei Jia,
  • Hui Gao,
  • Qingfeng Chang,
  • Peng Zhang,
  • Tuo Wang,
  • Jinlong Gong

摘要

To realize industrially feasible CO2 conversion, it is particularly important to achieve efficient catalysis in large-area electrocatalytic CO2 reduction (CO2RR) electrolyzers. However, the flooding and salt precipitation within electrolyzers make this extremely challenging. Currently, hydrophobic Teflonated carbon papers (TCPs) are widely used in CO2RR electrolyzers. However, the use of TCP can lead to poor electrode conductivity, catalyst agglomeration, and detachment, thereby reducing the catalytic performance of the electrolyzers. This paper describes the design and construction of a three-dimensional hydrophobic catalytic structure by modifying hydrophilic raw carbon paper with tetrafluorooctyltriethoxysilane and spraying Ag catalyst. By analyzing the catalytic performance, surface ion concentration, and salt precipitation distribution of the electrode, the optimization effect of the three-dimensional hydrophobic catalytic structure on the three-phase interface is elucidated. The results show that the three-dimensional catalytic structure effectively increases the catalytic area, reduces the penetration of electrolyte into the electrode, and reduces salt precipitation. Meanwhile, the three-dimensional catalytic structure facilitates efficient charge transfer and regulates the H2O and CO2 concentrations around the catalysts. After operating at a current density of 200 mA/cm2 for 100 h in KOH solution, the Faraday efficiency of CO remains above 88%, with a cell voltage of approximately 3 V.