Publication date: 15th December 2025
Electrochemical CO2 reduction (CO2R) offers a path to mitigate global greenhouse emissions by converting atmospheric and waste CO2 into widely used chemicals such as syngas, formic acid, methane, ethanol, and ethylene, among others, using renewable and low carbon electricity. However, CO2 electrolysis continues to be limited by key challenges, including the formation of unwanted carbonates under alkaline conditions and relatively low selective efficiency throw multi-carbon. In our work, a tandem CO₂ electrolyser was engineered for acetate production. This integrated system shows improved potential in both efficiency and selectivity, using a bicarbonate solution to in situ generate CO2 which is then converted into highly selective carbon monoxide (CO) with high faradaic efficiency (>90%) and a cell potential of around 3 V. The resulting CO stream is coupled to a second step that produces and concentrates acetate. Acetate partial current density above 120 mA/cm2 and cell potential below 3 V were achieved. Finally, we discuss an integration of an efficient route for converting CO₂ into biodegradable plastics (PHA) by engineering upgrading pathways in microbial systems.
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