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<p>Salt precipitation and carbon loss caused by carbonate formation and crossover limit the industrial scalability of CO<sub>2</sub> electrolysis using alkaline or pH-neutral electrolytes. Here we constructed an alkaline polymer layer-coated proton-exchange-membrane electrolyzer to suppress CO<sub>2</sub> crossover and prevent salt precipitation by pure water feeding. Guided by finite element simulations, alkaline polymers with a high density of quaternary ammonium groups were synthesized to enrich OH<sup>−</sup> and modulate the electric field within the catalyst electric double layer, thereby enhancing CO<sub>2</sub> adsorption and interfacial ionic conductivity. Consequently, the electrolyzer achieved a single-pass CO<sub>2</sub> conversion of 62.4%, energy efficiency of 39.0% and ~80% CO<sub>2</sub> utilization, with stable operation for 260 h at 200 mA cm<sup>−2</sup>. In addition, a scaled-up electrolyzer stack comprising 6 × 100 cm<sup>2</sup> membrane electrode assemblies produced CO at a maximum rate of 2,054.5 ml min<sup>−1</sup> at 70 A.</p><p></p>

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Co-electrolysis of CO2 and H2O in an alkaline polymer layer-coated proton-exchange-membrane electrolyzer

  • 期刊论文

  • 发表日期：

    2026年4月16日

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  • Yanpeng Song,
  • Xinhui Guo,
  • Yunfan Fu,
  • Ziqi Liao,
  • Zichao Wu,
  • Pengfei Wei,
  • Guoxiong Wang,
  • Xinhe Bao

摘要

Salt precipitation and carbon loss caused by carbonate formation and crossover limit the industrial scalability of CO2 electrolysis using alkaline or pH-neutral electrolytes. Here we constructed an alkaline polymer layer-coated proton-exchange-membrane electrolyzer to suppress CO2 crossover and prevent salt precipitation by pure water feeding. Guided by finite element simulations, alkaline polymers with a high density of quaternary ammonium groups were synthesized to enrich OH− and modulate the electric field within the catalyst electric double layer, thereby enhancing CO2 adsorption and interfacial ionic conductivity. Consequently, the electrolyzer achieved a single-pass CO2 conversion of 62.4%, energy efficiency of 39.0% and ~80% CO2 utilization, with stable operation for 260 h at 200 mA cm−2. In addition, a scaled-up electrolyzer stack comprising 6 × 100 cm2 membrane electrode assemblies produced CO at a maximum rate of 2,054.5 ml min−1 at 70 A.