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标题：Platinum - Manganese Cobaltite- Graphene Ternary Nanocomposites as Efficient Electrocatalysts for Methanol Electrooxidation in 0.5 M H2SO4
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作者：Ajay Kumar ; V.K.V. P. Srirapu ; C.S. Sharma 等
期刊名称：International Journal of Innovative Research in Science, Engineering and Technology
印刷版ISSN：2347-6710
电子版ISSN：2319-8753
出版年度：2015
卷号：4
期号：7
页码：6289
DOI：10.15680/IJIRSET.2015.0407137
出版社：S&S Publications
摘要：Novel ternary nanocomposites of Pt, MnCo2O4 and graphene nanosheets (GNS) with compositionalformula, 20wt%Pt/xwt% MnCo2O4/GNS (where x = 0, 6, 8, 10, 15 and 20) have been prepared and investigated aselectrocatalysts for methanol oxidation in 0.5 M H2SO4 at 25 °C using cyclic voltammetry and chronoamperometrytechniques. Structural characterization of electrocatalysts were carried out by X-ray diffraction (XRD) and transmissionelectron microscopy(TEM). In each composite, Pt followed a crystalline face-centered cubic (fcc) structure withcrystallite size ranging between 6.6-8.6 nm. The Study indicates that addition of low amounts of the oxide (6-20wt%)into 20wt%Pt/GNS is greatly beneficial with regard to enhancement in accessible Pt sites, electrocatalytic activity, COpoisoning tolerance and stability of the composite. It is, further, observed that with the increase of the oxide contentfrom 6 to 10 wt% in the composite, the rate of oxidation of methanol greatly enhances while it decreases with thehigher oxide additions, 15 and 20%. At E = 0.842 V vs. RHE in 0.5 M H2SO4 + 1 M CH3OH, the electrocatalyticactivity of 20wt%Pt/10wt%MnCo2O4/GNS was approximately 2.6 times higher than that of the base (20wt%Pt/GNS)electrode. The CO poisoning tolerance of this electrode was also much higher than the base electrode under similarexperimental conditions. Thus, ternary composite electrocatalyst with 10wt% oxide could be a potential Pt-based anodein direct methanol fuel cell.
关键词：Methanol Electrooxidation; Nanocomposites; Graphene Nanosheets; electrocatalysis; Direct Methanol;Fuel Cells.