Preparation of the Reduced Graphene Oxide-Based Tin Selenide Nano-Petal Composite and Its Electrocatalytic Properties
The reduction of graphene oxide(GO),in-situ loading of SnSe and interface assembly were achieved simultaneously by microwave method,and the reduced graphene oxide(rGO)-supported the petal-shaped SnSe(SnSe/rGO)composite was successfully prepared.The SnSe/rGO was characterized by Raman spectroscopy,X-ray photoelectron spectroscopy(XPS)and scanning electron microscopy(SEM),and the effects of different rGO contents for SnSe/rGO composite on the electrocatalytic oxygen reduction reaction(ORR)were investigated.The results indicated that there was an interaction between SnSe and matrix rGO,and Sn-C and Sn-O-C bonds were used as bridges of charge transfer.The intimate interconnection between the petal-like SnSe and the rGO formed a robust three-dimensional mesh structure,which served to reinforce the overall structural integrity of the catalyst,preventing its collapse.Based on this,the optimized SnSe/10%rGO catalyst(10rGO means that the mass fraction of rGO is 10%)exhibited excellent ORR activity with a limiting current density of 3.79 mA/cm2,an onset voltage(vs.RHE)of 0.85 V,and an electron transfer number of 3.10.Meanwhile,the SnSe/10%rGO catalyst performed the electrocatalysis long-term stability superior that of commercial 20%Pt/C(20%Pt means that the mass fraction of Pt is 20%)with the current density remaining 81.15%of the start value after 20 000 s of reaction.The present work offers insights into the preparation of non-precious metal cathode oxygen reduction catalytic materials for fuel cells.
Tin selenideReduced graphene oxideOxygen reductionFuel cellMicrowave method
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