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Immobilization of a molecular Re complex on MOF‐derived hierarchical porous carbon for CO2 electroreduction in water/ionic liquid electrolyte

Abstract : The development of molecular catalysts for CO2 electroreduction within electrolyzers requests their immobilization on the electrodes. While a variety of methods have been explored for the heterogenization of homogeneous complexes, we here report a novel approach using a hierarchical porous carbon material, derived from a Metal Organic Framework, as a support for the well‐known molecular catalyst [Re(bpy)(CO)3Cl] (bpy = 2,2’‐bipyridine). This cathodic hybrid material, named Re@HPC, has been tested for CO2 electroreduction using a mixture of an ionic liquid (1‐Ethyl‐3‐methylimidazolium tetrafluoroborate, EMIM) and water as the electrolyte. Interestingly, it catalyzes the conversion of CO2 into a mixture of carbon monoxide and formic acid, with a selectivity that depends on the applied potential. The present study thus reveals that Re@HPC is a remarkable catalyst, enjoying excellent activity (turnover numbers for CO2 reduction of 7835 after 2 h at ‐1.95 V vs Fc/Fc+ with a current density of 6 mA cm‐2) and good stability. These results emphasize the advantages of integrating molecular catalysts onto such porous carbon materials for developing novel, stable and efficient, catalysts for CO2 reduction.
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https://hal-univ-pau.archives-ouvertes.fr/hal-02950396
Contributor : Laurent Billon <>
Submitted on : Sunday, September 27, 2020 - 10:02:00 PM
Last modification on : Tuesday, September 29, 2020 - 3:32:05 AM

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Marc Fontecave, Domenico Grammatico, Huan Ngoc Tran, Yun Li, Silvia Pugliese, et al.. Immobilization of a molecular Re complex on MOF‐derived hierarchical porous carbon for CO2 electroreduction in water/ionic liquid electrolyte. ChemSusChem, ChemPubSoc Europe/Wiley, 2020, ⟨10.1002/cssc.202002014⟩. ⟨hal-02950396⟩

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