Abstract
Because of its vast number of applications and high price many studies have been made onhow to reduce the amount of platinum in catalysts. One method includes dispersingplatinum nanoparticles in porous support materials. But electrically conductivecarbon-based support materials—needed for fuel cell electrodes—permit nanoparticlesto migrate and form larger clusters, leading to reduced catalytic activity overtime. To find a solution to this problem, we modelled the interaction of group 4Ametal porphyrins (germanium (II) porphyrin (GePor), tin (II) porphyrin (SnPor) andlead (II) porphyrin (PbPor)) with platinum (Pt) using density functional theory.We showed that platinum can bond strongly on both germanium porphyrin andtin porphyrin. More importantly, valence Pt d-orbital characteristics dominatetheir HOMO and HOMO-1. Our study indicates that dispersing Pt as individualatoms on a SnPor and GePor surface is a good way to minimize platinum load incarbon-based reduction catalysts for reactions involving mainly the HOMO andHOMO-1 of Pt, of which the oxygen reduction reaction in fuel cells is an example.
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