Three different types of reduced graphene oxide (rGO) were prepared starting from graphite oxide (GO) produced with the Hummers’ method using three different exfoliation-reduction strategies: thermal annealing under N2 atmosphere at 700 °C, thermal annealing under H2–N2 (1:1 vol.) atmosphere at 500 °C and ultrasonication. Then, three non-noble metal catalysts (NNMC) for the oxygen reduction reaction (ORR) were synthesized using these three different rGO as carbon supports, by impregnation of a complex formed between Fe(II) ions and 2,4,6-tris(2-pyridyl)-1,3,5-triazine (TPTZ) as source of nitrogen, followed by a pyrolysis at 800 °C. The physical-chemical properties of rGO and Fe-N/rGO catalysts were characterized by N2 physisorption, XRD, XPS, SEM, and EDX. The capacitive behavior and the ORR activity of rGO and Fe-N/rGO catalysts were measured in alkaline conditions by cyclic voltammetry (CV) and rotating disk electrode (RDE), respectively. The three different reduction-exfoliation methods used for the rGO preparation influenced the physical-chemical properties, as well as the capacitive currents and the ORR activity of both rGO and Fe-N/rGO. This provides an insight about which synthesis process could be the most convenient for the final application.
|Titolo:||The use of different types of reduced graphene oxide in the preparation of Fe-N-C electrocatalysts: capacitive behavior and oxygen reduction reaction activity in alkaline medium|
|Data di pubblicazione:||2016|
|Digital Object Identifier (DOI):||10.1007/s10008-016-3332-2|
|Appare nelle tipologie:||1.1 Articolo in rivista|
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