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Title: Efficient electrocatalytic performance of thermally exfoliated reduced graphene oxide-Pt hybrid

Abstract

Highlights: • Synthesis of Pt–RGO nanohybrids of very high electrochemically active surface area. • Electrocatalytic activity-cum-stability: ∼10 times that of commercial Pt-C catalyst. • TEM confirms narrow size distribution and excellent dispersion of Pt nanoparticles. • SAED and XRD indicate (1 1 1) orientation of Pt nanoparticles. • Methanol oxidation EIS reveal decrease in charge transfer resistance with potential - Abstract: High quality thermally exfoliated reduced graphene oxide (RGO) nanosheets decorated with platinum nanocrystals have been synthesized using a simple environmentally benign process. The electrocatalytic behaviour of the Pt–RGO nanohybrid for methanol oxidation was studied using cyclic voltammetry, chronoamperometry and electrochemical impedance spectroscopy. High resolution transmission electron microscopy shows uniform dispersion of Pt nanoparticles of ∼2–4 nm size. X-ray diffraction and selected area diffraction studies reveal (1 1 1) orientation of the platinum nanoparticles. The cyclic voltammetry and chronoamperometry results indicate higher catalytic activity and stability for Pt–RGO compared to commercial Pt-C. The electrochemical active surface area of Pt–RGO (52.16 m{sup 2}/g) is found to be 1.5 times that of commercial Pt-C. Impedance spectroscopy shows different impedance behaviour at different potential regions, indicating change in methanol oxidation reaction mechanism with potential. The reversal of impedance pattern to the second quadrant,more » at potentials higher than ∼0.40 V, indicates change in the rate determining reaction.« less

Authors:
; ; ; ;
Publication Date:
OSTI Identifier:
22475890
Resource Type:
Journal Article
Journal Name:
Materials Research Bulletin
Additional Journal Information:
Journal Volume: 70; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0025-5408
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AMPEROMETRY; CATALYSTS; DISPERSIONS; DISTRIBUTION; ELECTROCHEMISTRY; ELECTRON DIFFRACTION; GRAPHENE; IMPEDANCE; NANOPARTICLES; NANOSTRUCTURES; PERFORMANCE; PLATINUM; RESOLUTION; SPECTROSCOPY; STABILITY; SURFACE AREA; SYNTHESIS; TRANSMISSION ELECTRON MICROSCOPY; VOLTAMETRY; X-RAY DIFFRACTION

Citation Formats

Antony, Rajini P., E-mail: raji.anna@gmail.com, Preethi, L. K., Gupta, Bhavana, Mathews, Tom, Dash, S., and Tyagi, A. K. Efficient electrocatalytic performance of thermally exfoliated reduced graphene oxide-Pt hybrid. United States: N. p., 2015. Web. doi:10.1016/J.MATERRESBULL.2015.04.015.
Antony, Rajini P., E-mail: raji.anna@gmail.com, Preethi, L. K., Gupta, Bhavana, Mathews, Tom, Dash, S., & Tyagi, A. K. Efficient electrocatalytic performance of thermally exfoliated reduced graphene oxide-Pt hybrid. United States. https://doi.org/10.1016/J.MATERRESBULL.2015.04.015
Antony, Rajini P., E-mail: raji.anna@gmail.com, Preethi, L. K., Gupta, Bhavana, Mathews, Tom, Dash, S., and Tyagi, A. K. 2015. "Efficient electrocatalytic performance of thermally exfoliated reduced graphene oxide-Pt hybrid". United States. https://doi.org/10.1016/J.MATERRESBULL.2015.04.015.
@article{osti_22475890,
title = {Efficient electrocatalytic performance of thermally exfoliated reduced graphene oxide-Pt hybrid},
author = {Antony, Rajini P., E-mail: raji.anna@gmail.com and Preethi, L. K. and Gupta, Bhavana and Mathews, Tom and Dash, S. and Tyagi, A. K.},
abstractNote = {Highlights: • Synthesis of Pt–RGO nanohybrids of very high electrochemically active surface area. • Electrocatalytic activity-cum-stability: ∼10 times that of commercial Pt-C catalyst. • TEM confirms narrow size distribution and excellent dispersion of Pt nanoparticles. • SAED and XRD indicate (1 1 1) orientation of Pt nanoparticles. • Methanol oxidation EIS reveal decrease in charge transfer resistance with potential - Abstract: High quality thermally exfoliated reduced graphene oxide (RGO) nanosheets decorated with platinum nanocrystals have been synthesized using a simple environmentally benign process. The electrocatalytic behaviour of the Pt–RGO nanohybrid for methanol oxidation was studied using cyclic voltammetry, chronoamperometry and electrochemical impedance spectroscopy. High resolution transmission electron microscopy shows uniform dispersion of Pt nanoparticles of ∼2–4 nm size. X-ray diffraction and selected area diffraction studies reveal (1 1 1) orientation of the platinum nanoparticles. The cyclic voltammetry and chronoamperometry results indicate higher catalytic activity and stability for Pt–RGO compared to commercial Pt-C. The electrochemical active surface area of Pt–RGO (52.16 m{sup 2}/g) is found to be 1.5 times that of commercial Pt-C. Impedance spectroscopy shows different impedance behaviour at different potential regions, indicating change in methanol oxidation reaction mechanism with potential. The reversal of impedance pattern to the second quadrant, at potentials higher than ∼0.40 V, indicates change in the rate determining reaction.},
doi = {10.1016/J.MATERRESBULL.2015.04.015},
url = {https://www.osti.gov/biblio/22475890}, journal = {Materials Research Bulletin},
issn = {0025-5408},
number = ,
volume = 70,
place = {United States},
year = {Thu Oct 15 00:00:00 EDT 2015},
month = {Thu Oct 15 00:00:00 EDT 2015}
}