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Article Dans Une Revue ChemElectroChem Année : 2021

CO 2 ‐to‐HCOOH Electrochemical Conversion on Nanostructured Cu x Pd 100−x /Carbon Catalysts

Résumé

Selective electrochemical conversion of CO2 to HCOOH is obtained at the surface of a carbon-supported bimetallic cathode material composed of copper and palladium nanoparticles. Polycrystalline copper or large copper particles are well-known to catalyze CO2 reduction to hydrocarbons at relatively negative potentials, or when their surface is covered by copper oxides (Cu2O and CuO). Cu-based materials modified by various palladium contents (0<×<100), were synthesized by using the microwave-assisted polyol method to serve as a cathode in the selective CO2-into-HCOOH transformation. Herein, we developed a targeted preparation route toward the metal content/catalytic activity relationship correlating atomic ratio with faradaic efficiency (FE) to formate formation (ca. 60 % FE) at −0.72 V vs. RHE, which represents a 703 mV overpotential at pH=7. Consequently, the occurrence of this reduction reaction slows down the parallel H2 production from the solvent consumption, while the neighboring Cu−Pd provides excellent activity and a good efficiency toward CO2 reduction via the hydridation of the CO2 molecule to orientate the reaction to formate rather than carbon monoxide or H2 evolution.

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Chimie
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hal-03441731 , version 1 (29-11-2021)

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Nihat Ege Şahin, Clément Comminges, Sandrine Arrii, Teko Napporn, Kouakou Kokoh. CO 2 ‐to‐HCOOH Electrochemical Conversion on Nanostructured Cu x Pd 100−x /Carbon Catalysts. ChemElectroChem, 2021, 8 (7), pp.1362-1368. ⟨10.1002/celc.202100268⟩. ⟨hal-03441731⟩
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