A Heterogenized Copper Phenanthroline System to Catalyze the Oxygen Reduction Reaction. Issue 3 (2nd February 2022)

• Record Type: Journal Article
• Authors: van der Ham, Cornelis J. M.; Zwagerman, Damy N. H.; Wu, Longfei; Hofmann, Jan P.; Hetterscheid, Dennis G. H.
• Is Part Of: ChemElectroChem. Volume 9:Issue 3(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-02-02
• Subjects: Copper -- Diazocoupling -- Electrochemistry -- Oxygen Reduction -- Surface Immobilization; Electrochemistry -- Periodicals; 541.37
• DOI: 10.1002/celc.202101365
• Languages: English
• ISSNs: 2196-0216

Abstract

Abstract: Upon the electrochemical reduction of an in situ generated 5‐diazo‐1, 10‐phenanthroline ion, phenanthroline was covalently attached to a gold electrode. The grafted molecules act as a ligand when brought in contact with a copper‐containing electrolyte solution. As the ligands are limited in spatial movement, the exclusive formation of the active species with only one phenanthroline ligand coordinated was expected. The in situ generated complexes have been investigated for activity in the oxygen reduction reaction, for which an overpotential of 800 mV is observed. During catalysis, initially a thick copper layer is formed on top of an organic layer that is still present on the gold surface. Upon deterioration of the organic layer underneath the copper over time, the amount of copper on the electrode and thereby the electrocatalytic activity decreases. Abstract : Beneficial layer : The immobilization of phenanthroline via a diazonium coupling reaction leads to a well‐defined thin organic layer on gold. Electrochemical reduction in the presence of Cu 2+ results in a relatively thick layer of copper, which is active for the oxygen reduction reaction. The activity depends on the presence of both copper and the organic ligand.