One-pot synthesis of Aud/graphene nanostructures: electrocatalytic ethanol oxidation for direct alcohol fuel cells (DAFCs)

Surfactant-free bimetallic Aud core-shell NPs on graphene sheets were fabricated from Au, Pd ions and graphene oxide by one-step reduction using ascorbic acid as an eco-friendly reducing agent. Aud NPs with about 7 nm size are evenly distributed on the surface of graphene. The core/shell structures...

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Bibliographic Details
Published inRSC advances Vol. 3; no. 23; pp. 8864 - 8870
Main Authors Jeong, Gyoung Hwa, Choi, Donghyeuk, Kang, Meejae, Shin, Jinseon, Kang, Ji-goo, Kim, Sang-Wook
Format Journal Article
LanguageEnglish
Published 01.05.2013
Subjects
Catalysts
Ethanol
Ethyl alcohol
Fuel cells
Gold
Graphene
Nanostructure
Palladium
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Summary:Surfactant-free bimetallic Aud core-shell NPs on graphene sheets were fabricated from Au, Pd ions and graphene oxide by one-step reduction using ascorbic acid as an eco-friendly reducing agent. Aud NPs with about 7 nm size are evenly distributed on the surface of graphene. The core/shell structures were confirmed with X-ray diffraction (XRD) and High-angle annual dark field scanning transmission microscopy (HAADF-STEM) mapping analysis. Prepared Aud/graphene nanocomposites show an excellent electrocatalytic activity toward ethanol oxidation: I sub(f) value that was the best for our catalysts is 11.6 A mg super(-1), which is about 5 times as high as that of the previous catalyst. The data resulted from extremely optimized bimetallic structure of a small Au core and a thin Pd shell. Pd atoms are constantly encouraged by adjacent Au atoms.
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ISSN:2046-2069
DOI:10.1039/c3ra40505b