Various Carbon Chain Containing Linkages Grafted Graphene with Silver Nanoparticles Electrocatalysts for Oxygen Reduction Reaction

Abstract

In this study, we have synthesized an efficient catalyst by various carbon chain containing linkers grafted graphene with silver nanoparticles (AgNPs)-decorated GO-S-(CH2)x-SH (where x = 2, 3, 4 and denoted as GO-Cx-Ag) for oxygen reduction reaction (ORR). The structural and morphological properties have investigated via several instrumental methods. Among those catalysts, the GO-C2-Ag has showed an excellent electrocatalytic performance by cyclic voltammetry (CV) and hydrodynamic techniques for ORR in alkaline media. Hydrodynamic voltammetry reveals that the GO-C2-Ag modified electrode has catalyzed effectively at higher potential. The overall electrocatalytic results showed that the GO-C2-Ag has better activity toward ORR and demonstrated nearly four electron transfer pathway into H2O due to much grafting of linker molecule and smaller size of AgNPs. The value of transferred electron number (n) and other kinetic parameters have demonstrated that the GO-C2-Ag is highly facilitated than that of GO-Ag and other GO-Cx-Ag to electrocatalytic oxygen reduction.