Electrocatalytically Active
Graphene–Porphyrin
MOF Composite for Oxygen Reduction Reaction
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Abstract
Pyridine-functionalized graphene (reduced graphene oxide)
can be
used as a building block in the assembly of metal organic framework
(MOF). By reacting the pyridine-functionalized graphene with iron–porphyrin,
a graphene–metalloporphyrin MOF with enhanced catalytic activity
for oxygen reduction reactions (ORR) is synthesized. The structure
and electrochemical property of the hybrid MOF are investigated as
a function of the weight percentage of the functionalized graphene
added to the iron–porphyrin framework. The results show that
the addition of pyridine-functionalized graphene changes the crystallization
process of iron–porphyrin in the MOF, increases its porosity,
and enhances the electrochemical charge transfer rate of iron–porphyrin.
The graphene–metalloporphyrin hybrid shows facile 4-electron
ORR and can be used as a promising Pt-free cathode in alkaline Direct
Methanol Fuel Cell