Formic acid-assisted synthesis of palladium nanocrystals and their electrocatalytic properties

Wang Q., Wang Y., Guo P., Li Q., Ding R., Wang B., Li H., Liu J. and Zhao X.S. (2014) Formic acid-assisted synthesis of palladium nanocrystals and their electrocatalytic properties. Langmuir, 30 1: 440-446. doi:10.1021/la404268j


Author Wang Q.
Wang Y.
Guo P.
Li Q.
Ding R.
Wang B.
Li H.
Liu J.
Zhao X.S.
Title Formic acid-assisted synthesis of palladium nanocrystals and their electrocatalytic properties
Journal name Langmuir   Check publisher's open access policy
ISSN 0743-7463
1520-5827
Publication date 2014-01-14
Year available 2013
Sub-type Article (original research)
DOI 10.1021/la404268j
Volume 30
Issue 1
Start page 440
End page 446
Total pages 7
Place of publication Washington, DC United States
Publisher American Chemical Society
Language eng
Subject 1603 Demography
3104 Condensed Matter Physics
3110 Surfaces and Interfaces
2500 Materials Science
1607 Social Work
Abstract Palladium (Pd) nanocrystals have been synthesized by using formic acid as the reducing agent at room temperature. When the concentration of formic acid was increased continuously, the size of Pd nanocrystals first decreased to a minimum and then increased slightly again. The products have been investigated by a series of techniques, including X-ray diffraction, high-resolution transmission electron microscopy (HRTEM), UV-vis absorption, and electrochemical measurements. The formation of Pd nanocrystals is proposed to be closely related to the dynamical imbalance of the growth and dissolution rate of Pd nanocrystals associated with the adsorption of formate ions onto the surface of the intermediates. It is found that small Pd nanocrystals showed blue-shifted adsorption peaks compared with large ones. Pd nanocrystals with the smallest size display the highest electrocatalytic activity for the electrooxidation of formic acid and ethanol on the basis of cyclic voltammetry and chronoamperometric data. It is suggested that both the electrochemical active surface area and the small size effect are the key roles in determining the electrocatalytic performances of Pd nanocrystals. A "dissolution- deposition-aggregation" process is proposed to explain the variation of the electrocatalytic activity during the electrocatalysis according to the HRTEM characterization.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2014 Collection
 
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