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

Abstract

© The Author(s) 2014. Published by ECS. In this study, we have synthesized an efficient catalyst by various carbon chain containing linkers grafted graphene with silver nanoparticles (AgNPs)-decorated GO-S-(CH 2 ) x -SH (where x = 2, 3, 4 and denoted as GO-C x -Ag) for oxygen reduction reaction (ORR). The structural and morphological properties have investigated via several instrumental methods. Among those catalysts, the GO-C 2 -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-C 2 -Ag modified electrode has catalyzed effectively at higher potential. The overall electrocatalytic results showed that the GO-C 2 -Ag has better activity toward ORR and demonstrated nearly four electron transfer pathway into H 2 O 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-C 2 -Ag is highly facilitated than that of GO-Ag and other GO-C x -Ag to electrocatalytic oxygen reduction.