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<p>Electrocatalytic CO<sub>2</sub> reduction reaction (CO<sub>2</sub>RR) technology holds significant industrial potential. However, when faced with elevated-temperature environments caused by industrial-scale operations, the fundamental understanding of temperature-dependent CO<sub>2</sub>RR behavior in flow cells remains elusive. This study points out that elevated-temperature operation (&gt;333 K) presents both challenges and opportunities for multi-carbon (C<sub>2+</sub>) production. While elevated temperature enhances reaction kinetics and reduces thermodynamic energy barriers, it simultaneously induces reconstruction of Cu-based catalyst, accelerates gas diffusion electrode flooding, and promotes *CO desorption together with hydrogen evolution reaction, collectively suppressing C<sub>2+</sub> product formation and compromising long-term reactor stability. Through rational design of hydrophobic-enhanced Pd-Cu<sub>2</sub>O/polytetrafluoroethylene (PTFE)/Ag tandem electrodes, we overcome these challenges. Leveraging thermal reduced C-C coupling barriers, the optimized electrode achieves &gt;70% Faradaic efficiency of C<sub>2+</sub> across industrially relevant current densities (200–1000 mA cm<sup>−2</sup>) at 348 K. This strategy converts elevated temperature adversity into a kinetic and thermodynamic advantage, boosting C<sub>2+</sub> cathodic energy efficiency by 1.3 times compared to ambient operation, establishing a promising paradigm for industrially viable CO<sub>2</sub> electrolysis.</p>

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Synergistic electrode design for efficient CO2 electrolysis to multicarbon products at elevated temperatures

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年2月12日

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  • Lang Hu,
  • Yun Yang,
  • Jiamin Wang,
  • Dongao Zhang,
  • Jingya Huang,
  • Yuqi Zhang,
  • Xiaodong Yi,
  • Guoxiong Wang,
  • Zhou Chen

摘要

Electrocatalytic CO2 reduction reaction (CO2RR) technology holds significant industrial potential. However, when faced with elevated-temperature environments caused by industrial-scale operations, the fundamental understanding of temperature-dependent CO2RR behavior in flow cells remains elusive. This study points out that elevated-temperature operation (>333 K) presents both challenges and opportunities for multi-carbon (C2+) production. While elevated temperature enhances reaction kinetics and reduces thermodynamic energy barriers, it simultaneously induces reconstruction of Cu-based catalyst, accelerates gas diffusion electrode flooding, and promotes *CO desorption together with hydrogen evolution reaction, collectively suppressing C2+ product formation and compromising long-term reactor stability. Through rational design of hydrophobic-enhanced Pd-Cu2O/polytetrafluoroethylene (PTFE)/Ag tandem electrodes, we overcome these challenges. Leveraging thermal reduced C-C coupling barriers, the optimized electrode achieves >70% Faradaic efficiency of C2+ across industrially relevant current densities (200–1000 mA cm−2) at 348 K. This strategy converts elevated temperature adversity into a kinetic and thermodynamic advantage, boosting C2+ cathodic energy efficiency by 1.3 times compared to ambient operation, establishing a promising paradigm for industrially viable CO2 electrolysis.