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<p>Captured CO<sub>2</sub> can either be stored or converted into a carbon-containing product. Both processes require energy to liberate CO<sub>2</sub> from the CO<sub>2</sub> capture solution. One way to bypass the energy-intensive recovery of CO<sub>2</sub> is to integrate CO<sub>2</sub> capture and conversion. For example, OH<sup>–</sup>-based capture solutions react with CO<sub>2</sub> to form (bi)carbonate-rich liquids, which can then be electrochemically converted into upgraded carbon-containing products while regenerating OH<sup>–</sup> for further CO<sub>2</sub> capture. However, bicarbonate electrolyzers designed to mediate this process are often characterized by high voltages (e.g., &gt;3 V at 100 mA cm<sup>–2</sup>). We report here a bicarbonate electrolyzer that operates at 100 mA cm<sup>–2</sup> with an applied voltage of 2.7 V at 50 °C. This lower voltage was made possible by designing a bicarbonate electrolyzer with a cationic exchange membrane that uses a neutral anolyte (3 M KHCO<sub>3(aq)</sub>) to minimize the thermodynamic potential for the oxygen evolution reaction. This bicarbonate electrolyzer enables a carbon capture and utilization energy efficiency for an electrochemical process that is comparable to thermochemical CO<sub>2</sub> conversion for syngas production.</p>

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Electrolytic pathway for upgrading waste CO2 into syngas with a carbon capture and utilization energy efficiency greater than 50%

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月3日

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  • Yongwook Kim,
  • Andrew M. L. Jewlal,
  • Eric W. Lees,
  • Zishuai Bill Zhang,
  • Shaoxuan Ren,
  • Chaitanya Donde,
  • Akshi Valji,
  • Benjamin A. W. Mowbray,
  • Amitava Sarkar,
  • Curtis P. Berlinguette

摘要

Captured CO2 can either be stored or converted into a carbon-containing product. Both processes require energy to liberate CO2 from the CO2 capture solution. One way to bypass the energy-intensive recovery of CO2 is to integrate CO2 capture and conversion. For example, OH–-based capture solutions react with CO2 to form (bi)carbonate-rich liquids, which can then be electrochemically converted into upgraded carbon-containing products while regenerating OH– for further CO2 capture. However, bicarbonate electrolyzers designed to mediate this process are often characterized by high voltages (e.g., >3 V at 100 mA cm–2). We report here a bicarbonate electrolyzer that operates at 100 mA cm–2 with an applied voltage of 2.7 V at 50 °C. This lower voltage was made possible by designing a bicarbonate electrolyzer with a cationic exchange membrane that uses a neutral anolyte (3 M KHCO3(aq)) to minimize the thermodynamic potential for the oxygen evolution reaction. This bicarbonate electrolyzer enables a carbon capture and utilization energy efficiency for an electrochemical process that is comparable to thermochemical CO2 conversion for syngas production.