Transition Metal Macrocycles as ORR Catalysts

M-N4 complexes can strongly and irreversibly adsorb on a graphite electrode surface to form a monolayer or multilayers of ORR catalysts. This adsorption can create a well-defined electrode surface, then provide a theoretical treatable situation for fundamental understanding of the catalyst activity and mechanism 

Catalysis, 38(1-2), Yeager Ernest, Dioxygen electrocatalysis mechanisms in relation to 

Theoretical approaches have in addition predicted that the substituents on the macrocyclic rings can also affect ORR catalytic activity. Co-phthalocyanine complexes with electron donating substituents should show improved ORR catalytic activity because the substituents can increase flie binding energy between O2 and the metal center(s) [55]. Calculation indicates fliat the catalytic activity of the transition metal macrocyclic complexes is due to flie partial electron transition between the filled d, dy, and empty r/ 2 orbitals of the transition metals, and the 

3 Heat-treated Transition Metal Macrocyclic Complexes 

Normally, transition metal macrocyclic complexes do not have long-term stability 

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