Abstract
A series of Pd@Pt nanoparticles were synthesized based on electrochemical seed growth method and co-reduction method in polyethylene-glycol and acetone solution system. The TEM/HR-TEM and XPS characterization proved that the prepared composite nanoparticles present core-shell structure and analyzed the chemical state of the particles. The electrocatalytic performance of Pd@Pt particles was studied by using the electrochemical workstation. The results showed that the Pd@Pt/C catalyst of different molar ratios of Pd to Pt exhibited preferable catalytic activity and stability for the methanol catalytic oxidation reaction. Among which, the Pd@Pt nanoparticles (Pd:Pt=1:1) prepared by co-reduction method, presented highest catalytic activity, which is 2 times higher than that of Pt/C catalyst. The high catalytic activity produced by the core-shell structure was briefly discussed.
Highlights
The shortage of fossil fuel, and the atmosphere pollution and greenhouse effect caused by the usage of fossil fuel are problems need to be solved urgently in energy and environmental fields
In the polyethylene-glycol (PEG)acetone solution system, the nanoparticles were synthesized by ultraviolet irradiation to reduce the mixture of Pd@Pt nanoparticles (Pd) (II) and Pt (IV) ions simultaneously; regarding the seed growth method, Pd was applied as the crystal seed, and the Pt (IV) ions were irradiated by ultraviolet light to reduce and deposit on the surface of Pd seed
The average diameter of the composite nanoparticles synthesized adopting coreduction method is in the range of 4.1~2.9 nm; and that using the seed growth method is in the range of 5.3~7.1 nm
Summary
The shortage of fossil fuel, and the atmosphere pollution and greenhouse effect caused by the usage of fossil fuel are problems need to be solved urgently in energy and environmental fields. Low-temperature fuel cells, including direct methanol fuel cell (DMFC) and proton exchange membrane fuel cell (PEMFC), exhibit an energy conversion rate as high as 60~80% and the actual service efficiency is 2~3 times of that of common internal combustion engine. It is a green, energy saving and high efficient alternative energy which is applied widely. Two novel methods for synthesizing Pd@Pt core-shell composite nanoparticles were presented based on the photochemistry. The research showed that the Pd@Pt core-shell composite nanoparticles present high catalytic activity for. The authors considered that the high activity resulted from the promotion of Pd to Pt
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