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<p>Electrochemical CO<sub>2</sub> reduction can generate multi-carbon (C<sub>2+</sub>) products via a CO<sub>2</sub>-to-CO cascade followed by CO reduction (COR). However, COR energy efficiency remains below 40% due to sluggish ion transport within charge-selective membranes. Here we introduce an uncharged porous separator that enables facile transport of both ion types, reducing ohmic resistance and superconcentrating cations at the catalyst surface—lowering COR voltage by 150 mV at 200 mA cm<sup>−2</sup>. In previous electrolyser designs, porous separators were limited by cathode-to-anode H<sub>2</sub> crossover; the low diffusivity of C<sub>2</sub>H<sub>4</sub> and CO in water allows a separator three times thinner and 1.6 times more porous, markedly reducing overpotential. Operating at elevated temperatures with a nickel–iron-based anode further lowers voltage by 330 mV, leading to a full-cell voltage of 1.95 V at 200 mA cm<sup>−2</sup> and an energy efficiency of 51% to C<sub>2+</sub> products sustained over 250 h. The system also achieves a CO single-pass conversion of 97% and a C<sub>2</sub>H<sub>4</sub> concentration of 87 wt% in the product gas stream.</p>

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CO electrolysers with 51% energy efficiency towards C2+ using porous separators

  • 期刊论文

  • 发表日期：

    2025年10月3日

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  • Rui Kai Miao,
  • Mengyang Fan,
  • Ning Wang,
  • Yong Zhao,
  • Feng Li,
  • Min Liu,
  • Fatemeh Arabyarmohammadi,
  • Yongxiang Liang,
  • Weiyan Ni,
  • Ke Xie,
  • Yuanjun Chen,
  • Puhua Sun,
  • Jianan Erick Huang,
  • Jinhong Wu,
  • Jiheon Kim,
  • Colin P. O’Brien,
  • Yurou Celine Xiao,
  • Zunmin Guo,
  • Panagiotis Papangelakis,
  • Ali Shayesteh Zeraati,
  • Yi Xu,
  • Cao-Thang Dinh,
  • Edward H. Sargent,
  • David Sinton

摘要

Electrochemical CO2 reduction can generate multi-carbon (C2+) products via a CO2-to-CO cascade followed by CO reduction (COR). However, COR energy efficiency remains below 40% due to sluggish ion transport within charge-selective membranes. Here we introduce an uncharged porous separator that enables facile transport of both ion types, reducing ohmic resistance and superconcentrating cations at the catalyst surface—lowering COR voltage by 150 mV at 200 mA cm−2. In previous electrolyser designs, porous separators were limited by cathode-to-anode H2 crossover; the low diffusivity of C2H4 and CO in water allows a separator three times thinner and 1.6 times more porous, markedly reducing overpotential. Operating at elevated temperatures with a nickel–iron-based anode further lowers voltage by 330 mV, leading to a full-cell voltage of 1.95 V at 200 mA cm−2 and an energy efficiency of 51% to C2+ products sustained over 250 h. The system also achieves a CO single-pass conversion of 97% and a C2H4 concentration of 87 wt% in the product gas stream.