Journal
CHEMSUSCHEM
Volume 6, Issue 10, Pages 1923-1930Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201300479
Keywords
electrochemistry; nanostructures; oxidation; palladium; synthesis design
Funding
- US Department of Energy (DOE) from the University of Wisconsin at Madison [DE-FG02-05ER15731]
- National Science Foundation (NSF) [DMR-1215034]
- Georgia Institute of Technology
- East China Normal University
- Southwest University
- China Scholarship Council (CSC)
- DOE, Basic Energy Sciences, Materials Sciences and Engineering Division [DE-AC02-98CH10886]
- Shared Research Equipment User Program
- DOE-BES
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1215034] Funding Source: National Science Foundation
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Pd icosahedra with sizes controlled in the range of 5-35 nm were synthesized in high purity through a combination of polyol reduction and seed-mediated growth. The Pd icosahedra were obtained with purity >94% and uniform sizes controlled in the range of 5-17 nm by using ethylene glycol as both the reductant and solvent. The studies indicate that the formation of Pd nanocrystals with an icosahedral shape was very sensitive to the reaction kinetics. The success of this synthesis relies on the use of HCl to manipulate the reaction kinetics and thus control the twin structure and shape of the resultant nanocrystals. The size of the Pd icosahedra could be further increased up to 35 nm by seed-mediated growth, with 17 nm Pd icosahedra serving as seeds. The multiply twinned Pd icosahedra could grow into larger sizes, and their shape and multiply twinned structure were preserved. Thanks to the presence of twin defects, the Pd icosahedra showed a catalytic current density towards formic-acid oxidation that was 1.9 and 11.6 times higher than that of single-crystal Pd octahedra, which were also fully covered by {111} facets, and commercial Pd/C, respectively.
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