Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 39, Issue 14, Pages 7326-7337Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2014.03.026
Keywords
Thermal decomposition; PdxNiy bimetallic nanoparticles; Formic acid oxidation reaction; Electrocatalysis
Categories
Funding
- National Natural Science Foundation of China [21173066]
- Natural Science Foundation of Hebei Province of China [B2011205014]
- US National Science Foundation [EAGER:CBET 11-37441]
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The nano-catalysts of PdxNiy, bimetallic nanoparticles (NPs, the nominal atomic ratios of Pd to Ni are 2:1, 3:2 and 1:1) supported on multi-walled carbon nanotubes (MWCNTs) (denoted as PdxNiy/MWCNTs) have been synthesized by a thermal decomposition process using room temperature ionic liquids (RTILs) of N-butylpyridinium tetrafluoroborate (BPyBP4) as the solvent. X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscopy (TEM) were employed to characterize the morphology of the samples, revealing that the prepared PdxNiy NPs were quite uniformly dispersed on the surface of MWCNTs with an average particle size of similar to 8.0 nm. Formic acid oxidation reaction (FAOR) was investigated on the as-prepared catalysts by using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS), demonstrating that the peak current on the Pd3Ni2/MWCNTs catalyst was about three times higher than that on the Pd/MWCNTs. The lower electrode potential and easier hydrogen evolution, based on the results obtained from chronopotentiometry and CV, respectively, were thought as the main reasons for the excellent electrocatalysis of the Pd3Ni2/MV/CNTs toward formic acid oxidation reaction (FAOR) when compared to other samples. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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