Microstructural and electrochemical properties of vertically aligned few layered graphene (FLG) nanoflakes and their application in methanol oxidation

N Soin, SS Roy, TH Lim, JAD McLaughlin

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Abstract

Vertically aligned few layered graphene (FLG) nanoflakes were synthesised on silicon substrates by microwave plasma enhanced chemical vapour deposition (MPECVD) method. Transmission electron microscopy (TEM) shows that the structures have highly graphitized terminal planes of 1–3 layers of graphene. Raman spectroscopy revealed a narrow G band with a FWHM of 23 cm−1 accompanied by a strong G′ (2D) band, with a FWHM of 43 cm−1 and an IG/IG′ ratio of 1, which are all the characteristics of highly crystallized few layered graphene. The FLG electrodes demonstrate fast electron transfer (ET) kinetics for Fe(CN)63−/4− redox system with an electron transfer rate, ΔEp, of 60 mV. Platinum (Pt) nanoparticles of 6 nm diameter were deposited on as grown FLGs using magnetron DC sputtering for methanol oxidation studies. When used as electrodes for methanol oxidation, a mass specific peak current density of 62 mA mg−1 cm−2 of Pt is obtained with a high resistance to carbon monoxide (CO) poisoning as evident by a high value of 2.2 for the ratio of forward to backward anodic peak currents
LanguageEnglish
Pages1051-1057
JournalMaterials Chemistry and Physics
Volume129
Issue number3
DOIs
Publication statusPublished - 2011

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Electrochemical properties
Graphene
Methanol
graphene
methyl alcohol
Oxidation
oxidation
Full width at half maximum
Platinum
carbon monoxide poisoning
electron transfer
platinum
Electrodes
electrodes
Electrons
high resistance
Silicon
Carbon Monoxide
Plasma enhanced chemical vapor deposition

Cite this

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title = "Microstructural and electrochemical properties of vertically aligned few layered graphene (FLG) nanoflakes and their application in methanol oxidation",
abstract = "Vertically aligned few layered graphene (FLG) nanoflakes were synthesised on silicon substrates by microwave plasma enhanced chemical vapour deposition (MPECVD) method. Transmission electron microscopy (TEM) shows that the structures have highly graphitized terminal planes of 1–3 layers of graphene. Raman spectroscopy revealed a narrow G band with a FWHM of 23 cm−1 accompanied by a strong G′ (2D) band, with a FWHM of 43 cm−1 and an IG/IG′ ratio of 1, which are all the characteristics of highly crystallized few layered graphene. The FLG electrodes demonstrate fast electron transfer (ET) kinetics for Fe(CN)63−/4− redox system with an electron transfer rate, ΔEp, of 60 mV. Platinum (Pt) nanoparticles of 6 nm diameter were deposited on as grown FLGs using magnetron DC sputtering for methanol oxidation studies. When used as electrodes for methanol oxidation, a mass specific peak current density of 62 mA mg−1 cm−2 of Pt is obtained with a high resistance to carbon monoxide (CO) poisoning as evident by a high value of 2.2 for the ratio of forward to backward anodic peak currents",
author = "N Soin and SS Roy and TH Lim and JAD McLaughlin",
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TY - JOUR

T1 - Microstructural and electrochemical properties of vertically aligned few layered graphene (FLG) nanoflakes and their application in methanol oxidation

AU - Soin, N

AU - Roy, SS

AU - Lim, TH

AU - McLaughlin, JAD

PY - 2011

Y1 - 2011

N2 - Vertically aligned few layered graphene (FLG) nanoflakes were synthesised on silicon substrates by microwave plasma enhanced chemical vapour deposition (MPECVD) method. Transmission electron microscopy (TEM) shows that the structures have highly graphitized terminal planes of 1–3 layers of graphene. Raman spectroscopy revealed a narrow G band with a FWHM of 23 cm−1 accompanied by a strong G′ (2D) band, with a FWHM of 43 cm−1 and an IG/IG′ ratio of 1, which are all the characteristics of highly crystallized few layered graphene. The FLG electrodes demonstrate fast electron transfer (ET) kinetics for Fe(CN)63−/4− redox system with an electron transfer rate, ΔEp, of 60 mV. Platinum (Pt) nanoparticles of 6 nm diameter were deposited on as grown FLGs using magnetron DC sputtering for methanol oxidation studies. When used as electrodes for methanol oxidation, a mass specific peak current density of 62 mA mg−1 cm−2 of Pt is obtained with a high resistance to carbon monoxide (CO) poisoning as evident by a high value of 2.2 for the ratio of forward to backward anodic peak currents

AB - Vertically aligned few layered graphene (FLG) nanoflakes were synthesised on silicon substrates by microwave plasma enhanced chemical vapour deposition (MPECVD) method. Transmission electron microscopy (TEM) shows that the structures have highly graphitized terminal planes of 1–3 layers of graphene. Raman spectroscopy revealed a narrow G band with a FWHM of 23 cm−1 accompanied by a strong G′ (2D) band, with a FWHM of 43 cm−1 and an IG/IG′ ratio of 1, which are all the characteristics of highly crystallized few layered graphene. The FLG electrodes demonstrate fast electron transfer (ET) kinetics for Fe(CN)63−/4− redox system with an electron transfer rate, ΔEp, of 60 mV. Platinum (Pt) nanoparticles of 6 nm diameter were deposited on as grown FLGs using magnetron DC sputtering for methanol oxidation studies. When used as electrodes for methanol oxidation, a mass specific peak current density of 62 mA mg−1 cm−2 of Pt is obtained with a high resistance to carbon monoxide (CO) poisoning as evident by a high value of 2.2 for the ratio of forward to backward anodic peak currents

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DO - 10.1016/j.matchemphys.2011.05.063

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VL - 129

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JO - Materials Chemistry and Physics

T2 - Materials Chemistry and Physics

JF - Materials Chemistry and Physics

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