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