An au@au/pt core-shell structured nanocatalyst for alcohol fuel cells
A nanocatalyst and shell structure technology, which is applied in nanotechnology for materials and surface science, fuel cells, structural parts, etc., can solve the problems of easy poisoning and low catalytic efficiency of ethanol fuel cells
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Embodiment 1
[0035] Example 1 Preparation of Au@AuPt core-shell nanostructure
[0036] 1.1 Preparation of Au nanoparticles
[0037] (1) Before the experiment, prepare several 25 mL beakers, medicine spoons, a 50 mL beaker, two magnetic stirrers, and one 50 mL measuring cylinder, soak them in aqua regia, wash and dry them before use. And 5-50 μL pipette, 100-1000 μL pipette.
[0038] (2) Take a clean beaker, pour a small amount of deionized water, put it in the freezer of the refrigerator, and set it aside. After the medicine spoon is washed and dried with deionized water and ethanol, take 0.364 g of hexadecyltrimethylammonium bromide with an electronic balance, and pipette 10 mL of deionized water into a beaker for dissolution. Weigh 0.033 g of sodium borohydride with an electronic balance, measure 10 mL of ice water, and pour it into a 25 mL beaker to dissolve. At 27°C, use a 5-50 μL pipette to pipette 42.5 μL of chloroauric acid (1%) and slowly add it to the prepared 5 mL of cetyltrimet...
Embodiment 2
[0051] Example 2 Characterization of physicochemical properties of prepared core-shell structure
[0052] 2.1 Form
[0053] The transmission electron microscope pictures of gold nanoparticles, Au@Ag core-shell nanocubes, Au@AuPt core-shell nanostructures and Au@Pt core-shell nanoparticles in Comparative Example 1 in Example 1 are as follows: figure 1 Shown in (a)-(c). It can be seen from the figure that the obtained Au@AuPt core-shell nanostructures are concave cubes with an average particle size of 29 ± 4 nm. The gold nanoparticles and Au@Ag core-shell nanocubes are monodisperse with an average particle size of 10±2 nm, and the average particle size of Au@Pt core-shell nanoparticles is 33±3 nm.
[0054] 2.2 UV-Vis spectrum
[0055] The gold nanoparticles in Example 1, Au@Ag core-shell nanocubes, Au@AuPt core-shell nanostructures and Au@Pt core-shell nanoparticles in Comparative Example 1 were scanned by ultraviolet-visible light spectrum, and the spectra were as follows ...
Embodiment 3
[0056] Example 3 Prepare the catalytic effect of core-shell structure on ethanol fuel cell
[0057] 3.1 Chronoamperometric and cyclic voltammetric characteristics
[0058] Au@Ag core-shell nanocubes, Au@AuPt core-shell nanostructures in Example 1, and Au@Pt core-shell nanoparticles in Comparative Example 1 were tested for chronocurrent and voltammetry characteristics. The detection conditions are as follows: 1.0 M sodium hydroxide and 1.0 M ethanol mixed solution are mixed, the scanning voltage is -1V~0.6V, and the scanning speed is 50 mV / s.
[0059] The chronoamperometry results are as image 3 As shown, it shows that the Au@AuPt core-shell nanocube has good catalytic performance and high stability.
[0060] The result of the voltammetric cycle curve is as follows Figure 4 Shown: the peak potential of Au@Pt core-shell nanoparticles (about -0.3 V) is lower than that of gold nanoparticles (about 0.2 V), indicating that the platinum shell enhances the catalytic effect on eth...
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