NDLI: Graphene/carbon nanospheres sandwich supported PEM fuel cell metal nanocatalysts with remarkably high activity and stability

Content Provider	Royal Society of Chemistry (RSC)
Author	Mu, Shichun Pan, Mu Peng, Tao He, Daping Cheng, Kun
Copyright Year	2013
Abstract	A new strategy to synthesize novel nano-sandwiched graphene/carbon/graphene (GCG) composites is described, employing the aqueous dispersion of low cost carbon nanospheres (CNS) in graphene oxide layers with subsequent thermal reduction. This 3D GCG sandwich shows a particular exfoliated graphene morphology, with CNS regularly embedded into the graphene nanosheets (GNS), from SEM and high-resolution TEM observations. The incorporation of CNS not only increases the Brunauer–Emmett–Teller (BET) surface area due to the effective expansion of the graphene interlayer, but also enhances the electrochemically accessible surface area and the charge transfer speed at the GCG–electrolyte interfaces due to a high density of between-plane electrolyte diffusion channels, that facilitate the reaction species transport and electron transport at high rates. As a result, this unique GCG nanoarchitecture with highly dispersed Pt particles exhibits a very high electrocatalytic activity for the oxygen reduction reaction (ORR). The half cell ORR mass activity of the Pt/GCG catalyst (17.7 A g−1) is 2.2 times of that of Pt/GNS (8.2 A g−1), and 3.8 times that of commercial Pt/C catalysts (4.6 A g−1). Moreover, the Pt/GCG catalyst also shows excellent electrochemical stability. Therefore our new catalyst holds tremendous promise for potential applications in proton exchange membrane (PEM) fuel cells.
Starting Page	2126
Ending Page	2132
Page Count	7
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	1
Issue Number	6
Journal	Journal of Materials Chemistry A
DOI	10.1039/c2ta00606e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	CNS Emmett Graphene Carbon Dispersion relation Three-dimensional space Sandwich compound Transmission electron microscopy Accessible surface area Electrolyte Diffusion Redox Electrochemistry Proton-exchange membrane
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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