Synergistic Hybrid Catalyst for Ethanol Detection: Enhanced Performance of Platinum Palladium Bimetallic Nanoparticles Decorated Graphene on Glassy Carbon Electrode
- Autores: Kumar M.1, Patnaik S.1, Lakshminarayanan V.2, Ramamurthy S.1
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Afiliações:
- Department of Chemistry
- Soft Condensed Matter Laboratory
- Edição: Volume 73, Nº 3 (2018)
- Páginas: 266-276
- Seção: Articles
- URL: https://journals.rcsi.science/1061-9348/article/view/182987
- DOI: https://doi.org/10.1134/S1061934818030073
- ID: 182987
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Resumo
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.
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Sobre autores
Manne Kumar
Department of Chemistry
Email: rsaisathish@sssihl.edu.in
Índia, Prashanthi Nilayam, A.P-, 515134
Sai Patnaik
Department of Chemistry
Email: rsaisathish@sssihl.edu.in
Índia, Prashanthi Nilayam, A.P-, 515134
V. Lakshminarayanan
Soft Condensed Matter Laboratory
Email: rsaisathish@sssihl.edu.in
Índia, C.V. Raman Avenue, Bangalore, Karnataka-, 560080
Sai Ramamurthy
Department of Chemistry
Autor responsável pela correspondência
Email: rsaisathish@sssihl.edu.in
Índia, Prashanthi Nilayam, A.P-, 515134