Quantitative Electro-Reduction of CO₂ to Liquid Fuel over Electro-Synthesized Metal–Organic Frameworks
2020
Kang, Xinchen | Wang, Bin | Hu, Kui | Lyu, Kai | Han, Xue | Spencer, Ben F. | Frogley, Mark D. | Tuna, Floriana | McInnes, Eric J. L. | Dryfe, Robert A. W. | Han, Buxing | Yang, Sihai | Schröder, Martin
Efficient electro-reduction of CO₂ over metal–organic framework (MOF) materials is hindered by the poor contact between thermally synthesized MOF particles and the electrode surface, which leads to low Faradaic efficiency for a given product and poor electrochemical stability of the catalyst. We report a MOF-based electrode prepared via electro-synthesis of MFM-300(In) on an indium foil, and its activity for the electrochemical reduction of CO₂ is assessed. The resultant MFM-300(In)-e/In electrode shows a 1 order of magnitude improvement in conductivity compared with that for MFM-300(In)/carbon-paper electrodes. MFM-300(In)-e/In exhibits a current density of 46.1 mA cm–² at an applied potential of −2.15 V vs Ag/Ag⁺ for the electro-reduction of CO₂ in organic electrolyte, achieving an exceptional Faradaic efficiency of 99.1% for the formation of formic acid. The facile preparation of the MFM-300(In)-e/In electrode, coupled with its excellent electrochemical stability, provides a new pathway to develop efficient electro-catalysts for CO₂ reduction.
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