期刊
JOURNAL OF POWER SOURCES
卷 280, 期 -, 页码 422-429出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.01.127
关键词
Pd nanocubes; Graphene; One-step method; Ethanol oxidation
资金
- National Natural Science Foundation of China [51102085, 61274010]
- Program for New Century Excellent Talents in University, Ministry of Education of China [NCET-09-0135]
- Natural Science Foundation of Hubei Province [2011CDB057, 2011CDA81]
- Science foundation from Hubei Provincial Department of Education [Q20111002]
Homogeneous distribution of cube-shaped Pd nanocrystals on the surface of reduced graphene oxide is obtained via a facile one-step method by employing AA and KBr as the reductant and capping agent, respectively. The experimental factors affecting the morphology and structure of Pd nanoparticles have been systematically investigated to explore the formation mechanism of Pd nanocubes (PdNCs). It is revealed that PdNCs enclosed by active (100) facets with an average side length of 15 nm were successfully synthesized on the surface of reduced graphene oxide. KBr plays the role for facet selection by surface passivation and AA controls the reduction speed of Pd precursors, both of which govern the morphology changes of palladium nanoparticles. In the further electrochemical evaluations, the Pd nanocubes/reduced graphene oxide composites show better electrocatalytic activity and stability towards the electro-oxidation of ethanol than both reduced graphene oxide supported Pd nanoparticles and free-standing PdNCs. It could be attributed to the high electrocatalytic activity of the dominated active (100) crystal facets of Pd nanocubes and the enhanced electron transfer of graphene. The developed approach provide a versatile way for shape-controlled preparation of noble metal nanoparticles, which can work as novel electrocatalysts in the application of direct alcohols fuel cells. (C) 2015 Elsevier B.V. All rights reserved.
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