Abstract
A robust triple-component electrocatalyst of sub-2 nm scale consisting of platinum nanoparticles (Pt NPs), iron(II) phthalocyanine (FePc), and reduced graphene oxide (rGO) composite (Pt/FePc@rGO) was fabricated for oxygen reduction reaction (ORR) evaluation. The catalyst was prepared using a Suspension Unit for Reactive Evolution (SURE) approach. The merit of the SURE approach lies in the ease of formation of smaller Pt NPs with a size of 1.76 ± 0.26 nm and uniformity of dispersion on rGO surface by hydrogen reduction. The Pt/FePc@rGO catalysts show superior mass activities of 281.29 mA mgPt–1 at 0.86 V in an alkaline potassium hydroxide (KOH) electrolyte system. Compared with the commercial Pt on carbon (Pt/C) catalysts, the ORR current density of the Pt/FePc@rGO catalysts shows 2.8 times greater under the same operating conditions, while the average Pt loading is only approximately one-third of the commercial catalyst (Pt/C). The result of accelerated durability test indicates the Pt/FePc@rGO catalysts ...
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