title: Electrocatalytic O2 reduction by covalently immobilized mononuclear copper(I) complexes: evidence for a binuclear Cu2O2 intermediate.
abstract: A Cu(I) complex of 3-ethynyl-phenanthroline covalently immobilized onto an azide-modified glassy carbon surface is an active electrocatalyst for the four-electron (4-e) reduction of O(2) to H(2)O. The rate of O(2) reduction is second-order in Cu coverage at moderate overpotential, suggesting that two Cu(I) species are necessary for efficient 4-e reduction of O(2). Mechanisms for O(2) reduction are proposed that are consistent with the observations for this covalently immobilized system and previously reported results for a similar physisorbed Cu(I) system.
authors.affiliation: Department of Chemistry, Stanford University, Stanford, California 94305, United States.
authors.forename: Charles C L
authors.initials: CC
authors.lastname: McCrory
authors.forename: Anando
authors.initials: A
authors.lastname: Devadoss
authors.forename: Xavier
authors.initials: X
authors.lastname: Ottenwaelder
authors.forename: Randall D
authors.initials: RD
authors.lastname: Lowe
authors.forename: T Daniel P
authors.initials: TD
authors.lastname: Stack
authors.forename: Christopher E D
authors.initials: CE
authors.lastname: Chidsey
mesh_terms: D002384:Catalysis; D003300:Copper / Q000737:chemistry*; D004563:Electrochemistry / Q000379:methods*; D007700:Kinetics; D010100:Oxygen / Q000737:chemistry*
chemical_list: D003300:Copper; D010100:Oxygen; C000520:cuprous oxide