• RAJU PRAVEEN

      Articles written in Journal of Chemical Sciences

    • Electrochemically co-deposited silicate sol–gel/PdAu alloy nanostructures and their application in electrocatalytic methanol oxidation

      RAJU PRAVEEN RAMASAMY RAMARAJ

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      Bimetallic PdAu alloy nanostructures incorporated ethylene diamine functionalized silicate sol gel (ES) nanocomposite materials on indium-tin-oxide (I) electrodes (I/ES-PdAu) were prepared by facileelectrochemical method. X-ray diffraction patterns confirmed the formation of single-phase bimetal PdAualloy nanostructures at the electrode. X-ray photoelectron spectroscopy analysis confirmed the existence of azero oxidation state of Pd and Au metals at the I/ES-PdAu electrode. Morphology analysis revealed theformation of anisotropic nanostructures of Au, Pd and PdAu alloy nanostructures with different sizes andshapes at the modified electrodes. Electrocatalytic methanol oxidation reaction (MOR) was studied andenhanced methanol oxidation activity was observed at the bimetallic I/ES-Pd75Au25 and I/ES-Pd50Au50 modified electrodes when compared to pristine I/ES-Pd100, I/Pd100 and I/ES-Au100 modified electrodes. TheI/ES-Pd75Au25 modified electrode was found to be the best electrocatalyst which showed lower overpotentialwith higher mass activity (0.144 A/mgPd) for MOR. Interestingly, when Pd was combined with Au in thepresence of ES silicate sol-gel the bimetallic PdAu alloy nanomaterials showed enhanced MOR activity. TheMOR current observed at the I/ES-Pd75Au25 electrode was nearly 1.8 times higher than that of the I/Pd75Au25 electrode without ES silicate sol-gel. The stability of the I/ES-Pd75Au25 electrode was tested by scanning 200continuous cycles and the catalytic current was found to decrease only < 5%.

      Electrochemically co-deposited PdAu bimetallic materials embedded in N-[3-(trimethoxysilyl) propyl]ethylenediamine silicate (ES) sol-gel modified electrode (I/ES-Pd75Au25) displayed 8.7 and 3.2 times higher methanol oxidation current and mass activity when compared to the pristine I/ES-Pd100 modified electrode due to ES silicate sol-gel supported mass interaction between PdAu alloy nanostructure with the analyte.

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