Synergistic Hybrid Catalyst for Ethanol Detection: Enhanced Performance of Platinum Palladium Bimetallic Nanoparticles Decorated Graphene on Glassy Carbon Electrode
- Authors: Kumar M.A.1, Patnaik S.G.1, Lakshminarayanan V.2, Ramamurthy S.S.1
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Affiliations:
- Department of Chemistry
- Soft Condensed Matter Laboratory
- Issue: Vol 73, No 3 (2018)
- Pages: 266-276
- Section: Articles
- URL: https://journals.rcsi.science/1061-9348/article/view/182987
- DOI: https://doi.org/10.1134/S1061934818030073
- ID: 182987
Cite item
Abstract
The present study highlights the first time use of hybrid synergy electrocatalysis to design a cost effective, non-enzymatic ethanol sensor. The nanohybrid has been synthesized by decorating platinum palladium bimetallic nanoparticles (Pt‒PdNPs) on graphene nanosheets (G/Pt‒PdNPs). Field emission scanning electron microscopy, energy dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, electrochemical measurements and UV-Vis spectrophotometry have been used to characterize the nanocomposite. An ethanol oxidation current of 332 μA was obtained with the use of G/Pt‒PdNPs modified glassy carbon electrode (GCE) that is 167 times higher than that of bare GCE in cyclic voltammetry studies with a potential scan rate of 50 mV/s in 0.1 M NaOH as the supporting electrolyte. Chronoamperometry studies have shown a distinct increase in the current for increasing concentration of ethanol with a wide range of linearity extending from 5 mM to 3 M and a detection limit of 1 mM with the use of G/Pt‒PdNPs. Quantum mechanical modeling using density functional theory was used to arrive at the minimization energies of G/Pd, G/Pt and G/Pt‒Pd in the presence and absence of ethanol. The improved catalytic activity of G/Pt‒PdNPs nanocomposite for ethanol detection is on account of the cooperative effects of Pt and PdNPs, coupled with the high conducting nature of graphene.
Keywords
About the authors
Manne Anupam Kumar
Department of Chemistry
Email: rsaisathish@sssihl.edu.in
India, Prashanthi Nilayam, A.P-, 515134
Sai Gourang Patnaik
Department of Chemistry
Email: rsaisathish@sssihl.edu.in
India, Prashanthi Nilayam, A.P-, 515134
V. Lakshminarayanan
Soft Condensed Matter Laboratory
Email: rsaisathish@sssihl.edu.in
India, C.V. Raman Avenue, Bangalore, Karnataka-, 560080
Sai Sathish Ramamurthy
Department of Chemistry
Author for correspondence.
Email: rsaisathish@sssihl.edu.in
India, Prashanthi Nilayam, A.P-, 515134