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<p>Ethylene (C<sub>2</sub>H<sub>4</sub>), a cornerstone of the chemical industry, is produced predominantly via fossil-intensive high-temperature processes that contribute significantly to global energy consumption and CO<sub>2</sub> emissions. Here, we report an ambient bipolar C<sub>2</sub>H<sub>4</sub> electrosynthesis system that concurrently decarboxylates propanoic acid, a prevalent biorefinery waste, at nanoporous Pt microparticles-coated anode and reduces CO<sub>2</sub> at W-doped CuO<sub>x</sub>-loaded cathode. Physicochemical and <i>operando</i> spectroscopy characterizations, along with theoretical modeling reveal that the polarized Pt-PtO<sub>2</sub> interface formed in situ downshifts the d-band relative to Fermi level which favors the desorption of *CH<sub>2</sub>CH<sub>2</sub> intermediate to promote selective propanoic acid decarboxylation toward C<sub>2</sub>H<sub>4</sub>. Remarkably, the resulting electrocatalyst couple delivers an unprecedented C<sub>2</sub>H<sub>4</sub> faradaic efficiency (FE<sub>C2H4</sub>) of 118.7% and a large current density of 1000 mA cm<sup>−2</sup>, and sustains a FE<sub>C2H4</sub> exceeding 103.4% for over 265 h at an industrial current density of 400 mA cm<sup>−2</sup>, offering a promising pathway to carbon-neutral C<sub>2</sub>H<sub>4</sub> production from waste feedstocks.</p>

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Bipolar ethylene electrosynthesis from CO2 and biowaste acid with total faradaic efficiency over 118%

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月14日

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  • Wenjie Xue,
  • Hui Jiang,
  • Jinlong Liu,
  • Xinqing Chen,
  • Conghui Tang,
  • Bao Yu Xia,
  • Bo You

摘要

Ethylene (C2H4), a cornerstone of the chemical industry, is produced predominantly via fossil-intensive high-temperature processes that contribute significantly to global energy consumption and CO2 emissions. Here, we report an ambient bipolar C2H4 electrosynthesis system that concurrently decarboxylates propanoic acid, a prevalent biorefinery waste, at nanoporous Pt microparticles-coated anode and reduces CO2 at W-doped CuOx-loaded cathode. Physicochemical and operando spectroscopy characterizations, along with theoretical modeling reveal that the polarized Pt-PtO2 interface formed in situ downshifts the d-band relative to Fermi level which favors the desorption of *CH2CH2 intermediate to promote selective propanoic acid decarboxylation toward C2H4. Remarkably, the resulting electrocatalyst couple delivers an unprecedented C2H4 faradaic efficiency (FEC2H4) of 118.7% and a large current density of 1000 mA cm−2, and sustains a FEC2H4 exceeding 103.4% for over 265 h at an industrial current density of 400 mA cm−2, offering a promising pathway to carbon-neutral C2H4 production from waste feedstocks.