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- W2078649209 abstract "Mononuclear Cu complexes with a 1,10-phenanthroline-based ligand adsorbed onto an edge-plane graphite electrode act as electrocatalysts for the 4-electron reduction of O2 to H2O. A mechanism is proposed for the electrocatalytic O2 reduction that accounts for the observed redox and kinetic dependences on coordinating anions and proton donors in the buffer. Systematic increases of ligand electron-withdrawing properties and/or the steric demands near the Cu center increase the E0 of the Cu catalysts but decrease the rate of O2 reduction. The kinetic rate of O2 reduction at E0, reported as kinetic current divided by catalyst redox charge, decreases as E0 increases: from 16 s-1 measured at E0 in air-saturated solutions for adsorbed Cu(phen) to 0.4 s-1 for Cu(2,9-Et2-phen). The maximum value of E for which catalytic activity can be attained is estimated to be +350 mV vs NHE. Near E0, the kinetic current deviates from that expected if O2 binding were the sole rate-limiting step. This indicates that one or more of the electrochemical reduction steps are rate limiting at potentials near E0." @default.
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- W2078649209 date "2007-12-01" @default.
- W2078649209 modified "2023-10-14" @default.
- W2078649209 title "Kinetic and Mechanistic Studies of the Electrocatalytic Reduction of O<sub>2</sub> to H<sub>2</sub>O with Mononuclear Cu Complexes of Substituted 1,10-Phenanthrolines" @default.
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- W2078649209 doi "https://doi.org/10.1021/jp076106z" @default.
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