NPs-Graphene hybrids dispersion by electrochemical methods

L. PÉREZ; MELISA JULIETA GÓMEZ; FEDERICO FIORAVANTI; ANTONELLA LOIACONO; NOELIA BAJALES LUNA; ESTEBAN ANDRÉS FRANCESCHINI; GABRIELA I. LACCONI

Lecce

Congreso; 19th Conference TNT 2018; 2018

Nanohybrid materials containing graphene sheetshave emerged as new model of materials with vastpotentials in electronics, optoelectronics, energytechnology, membrane design, sensing andbiomedical applications. Last years, we havedesigned hybrid platforms with graphene and Nps inorder to improve the surface analysis methods suchas SERS (surface-enhanced Raman scattering) andTERS (tip-enhancement Raman spectroscopy).1In this communication, we show simpleelectrochemical strategies2,3 carried out for obtaininghybrid Nps-Graphene structures (Pd-GO and AuPdGO) dispersed in solution. The free-standing hybridstructures in aqueous solution were obtained bygalvanostatic electroreduction of GO dispersion inthe presence of metallic precursors and stabilizingagents, under controlled agitation of the electrolyte(Fig. 1)2.The morphology and structure of hybrid materialswere determined by optical, Atomic force andelectronic microscopies (SEM and TEM), while thechemical information was recorded through EDS,XPS and Raman spectroscopies(Fig. 2).Applications are shown by using the hybridnanostructures as modifiers of the nickel surfacefor increasing the catalytic activity of the electrodefor the evolution of hydrogen (HER).Electrocatalytic activity was comparativelyperformed by incorporation of Nitrogen-doped GOand MoS2 particles in the nickel matrix3.References[1] LA Pérez, MC Dalfovo, HE Troiani, AL Soldati, GILacconi, FJ Ibañez, J. Phys. Chem. C 120 (2016) 8315[2] PM Uberman, LA Pérez, SE Martín, GI Lacconi,RSC Adv 4 (2014) 12330.[3] EA Franceschini, GI Lacconi GI, Electrocatalysis,9 (2018) 47