Journal
JOURNAL OF CHEMICAL SCIENCES
Volume 121, Issue 5, Pages 735-743Publisher
INDIAN ACAD SCIENCES
DOI: 10.1007/s12039-009-0088-6
Keywords
Core-shell Au/Ag nanoparticles; modified electrode; electrocatalysis; hydrogen peroxide; sensor
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Funding
- Department of Science and Technology (DST)
- Council of Scientific and Industrial Research (CSIR), New Delhi
- UGC-JRF fellowship
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The electrocatalytic activity of core-shell Au100-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.
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