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Plot in the bottom, left shows the percentage of partially reduced oxygen species produced during electrocatalytic O2 reduction at slow and fast electron transfer rates. The effect of the Cu ion, tyrosine mimic, and linker between the Fe-Cu system and the electrode were evaluated with respect to catalyst selectivity, stability, and rates of electron transfer. Adapted with permission from ref 1044. Copyright 2007 American Association for the Advancement of Science.
