Evolution of bismuth-based metal-organic frameworks for efficient electroreduction of CO2

Lili Li, Xinchen Kang, Meng He, Alena Sheveleva, Kui Hu, Shaojun Xu, Yiqi Zhou, Jin Chen, Sergei Sapchenko, George Whitehead, Laura Lopez Odriozola, Louise Natrajan, Eric Mcinnes, Martin Schroder, Sihai Yang, Floriana Tuna

Research output: Contribution to journalArticlepeer-review


Understanding the structural and chemical changes that reactive metal-organic frameworks (MOFs) undergo is crucial for the development of new efficient catalysts for electrochemical reduction of CO2. Here, we describe three Bi(III) materials, MFM-220, MFM-221 and MFM-222, which are constructed from the same ligand (biphenyl-3,3’,5,5’-tetracarboxylic acid) but which show distinct porosity with solvent-accessible voids of 49.6%, 33.6% and 0%, respectively. We report the first study of the impact of porosity of MOFs on their evolution as electrocatalysts. A Faradaic efficiency of 90.4% at -1.1 V vs RHE (reversible hydrogen electrode) is observed for formate production over an electrode decorated with MFM-220-p formed from MFM-220 on application of an external potential in the presence of 0.1 M KHCO3 electrolyte. In situ electron paramagnetic resonance spectroscopy confirms the presence of ·COOH radicals as a reaction intermediate, with an observed stable and consistent Faradic efficiency and current density for production of formate by electrolysis over 5 h. This study emphasises the significant role of porosity of MOFs as they react and evolve during electroreduction of CO2 to generate value-added chemicals.
Original languageEnglish
JournalJournal of Materials Chemistry A
Publication statusAccepted/In press - 3 Aug 2022


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