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
U2 - 10.1016/j.matchemphys.2011.05.063
DO - 10.1016/j.matchemphys.2011.05.063
M3 - Article
VL - 129
SP - 1051
EP - 1057
JO - Materials Chemistry and Physics
JF - Materials Chemistry and Physics
IS - 3
ER -