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https://www.ias.ac.in/article/fulltext/jcsc/121/05/0735-0743

Core-shell Au/Ag nanoparticles; modified electrode; electrocatalysis; hydrogen peroxide; sensor.

The electrocatalytic activity of core-shell Au$_{100-x}$Ag$_x$ ($x = 15$, 27, 46, and 60) bimetallic nanoparticles embedded in methyl functionalized silicate MTMOS network towards the reduction of hydrogen peroxide was investigated by using cyclic voltammetry and chronoamperometric techniques. Core-shell Au/Ag bimetallic nanoparticles were characterized by absorption spectra and HRTEM. The MTMOS silicate sol-gel embedded Au₇₃Ag₂₇ core-shell nanoparticles modified electrode showed better synergistic electrocatalytic effect towards the reduction of hydrogen peroxide when compared to monometal MTMOS-Au_nps and MTMOS-Ag_nps modified electrodes. These modified electrodes were studied without immobilizing any enzyme in the MTMOS sol-gel matrix. The present study highlights the influence of molar composition of Ag nanoparticles in the Au/Ag bimetallic composition towards the electrocatalytic reduction and sensing of hydrogen peroxide in comparison to monometal Au and Ag nanoparticles.

Shanmugam Manivannan¹ Ramasamy Ramaraj¹

1. Centre for Photoelectrochemistry, School of chemistry, Madurai Kamaraj University, Madurai 625 021

Published

September 2009