Efficient Capture and Electroreduction of Dilute CO 2 into Highly Pure and Concentrated Formic Acid Aqueous Solution

High-purity CO2 rather than dilute CO2 (15 vol %, CO2/N2/O2 = 15:80:5, v/v/v) similar to the flue gas is currently used as the feedstock for the electroreduction of CO2, and the liquid products are usually mixed up with the cathode electrolyte, resulting in high product separation costs. In this work, we showed that a microporous conductive Bi-based metal–organic framework (Bi-HHTP, HHTP = 2,3,6,7,10,11-hexahydroxytriphenylene) can not only efficiently capture CO2 from the dilute CO2 under high humidity but also catalyze the electroreduction of the adsorbed CO2 into formic acid with a high current density of 80 mA cm–2 and a Faradaic efficiency of 90% at a very low cell voltage of 2.6 V. Importantly, the…

• NN
  National Natural Science Foundation of China

  Award: 21890380, 21821003, 22371304 and 223B2123
• NK
  National Key Research and Development Program of China

  Award: 2021YFA1500401
• SF
  Special Fund Project for Science and Technology Innovation Strategy of Guangdong Province

  Award: STKJ2023078