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Functionalizing Gold Nanoparticles with Calix[4]arenes Monolayers for Enhancing Selectivity and Stability in ORR Electrocatalysis

par Lenne, Quentin;Mattiuzzi, Alice ;Jabin, Ivan ;Le Poul, Nicolas;Leroux, Yann;Lagrost, Corinne
Référence Advanced Materials Interfaces, 7, 23, 2001557
Publication Publié, 2020-12-01

Article révisé par les pairs

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Résumé :

The deliberate surface modification of nanocatalysts with organic ligands has recently emerged as a promising strategy to boost their efficiency, durability, and/or selectivity in key electrocatalytic processes. The interface between the metallic interface and the immobilized ligands promotes high electrocatalytic activity. Herein, the oxygen reduction reaction activity of gold nanoparticles functionalized with a covalently bound monolayer of calix[4]arenes is compared with commercially available gold nanoparticles, classically stabilized through electrostatic adsorption of citrates onto the gold surfaces. Nanocatalysts coated by calix[4]arenes show enhanced selectivity and stability compared to their citrate-stabilized counterparts. These nanohybrids exhibit excellent activity with a dominant 4-electron reduction of O2 with good electrocatalytic performances along with a high robustness under operation as revealed by X-ray photoelectron spectroscopy analyses.