Au@Au/Pt core-shell structure nano catalyst applied to alcohol fuel cells

A nano-catalyst and fuel cell technology, applied in nanotechnology, fuel cell, nanotechnology, etc. for materials and surface science, can solve the problems of low catalytic efficiency and easy poisoning of ethanol fuel cells, and achieve good and stable catalytic activity Good performance and load reduction effect

Inactive Publication Date: 2018-06-01
UNIV OF JINAN
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the current problem that ethanol fuel cells catalyzed by noble metal nanocatalysts are prone to poisoning and low catalytic efficiency, the present invention provides an Au@Au / Pt core-shell structure nanocatalyst for alcohol fuel cells, which has higher catalytic efficiency and no catalyst Poisoning phenomenon, high utilization efficiency of precious metals

Method used

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  • Au@Au/Pt core-shell structure nano catalyst applied to alcohol fuel cells
  • Au@Au/Pt core-shell structure nano catalyst applied to alcohol fuel cells
  • Au@Au/Pt core-shell structure nano catalyst applied to alcohol fuel cells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1 Preparation of Au@AuPt core-shell nanostructures

[0036] 1.1 Preparation of Au nanoparticles

[0037] (1) Before the experiment, prepare several 25 mL beakers, medicine spoons, a 50 mL beaker, 2 magnetic stir bars, and a 50 mL graduated cylinder, soak in aqua regia, wash and dry before use. As well as 5-50 μL pipettes, 100-1000 μL pipettes.

[0038] (2) Take a clean beaker, pour in a small amount of deionized water, put it in the freezer of the refrigerator and freeze it for later use. The medicine spoon is washed with deionized water, washed and dried with ethanol, weigh 0.364 g of cetyl trimethyl ammonium bromide with an electronic balance, and add 10 mL of deionized water with a pipette to the beaker to dissolve. Weigh 0.033 g of sodium borohydride with an electronic balance, take 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%) into the prepared 5 mL of cetyltrimet...

Embodiment 2

[0051] Example 2 Preparation of core-shell structure Physical and chemical properties characterization

[0052] 2.1 Morphology

[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, Au@Ag core-shell nanocubes, Au@AuPt core-shell nanostructures in Example 1 and Au@Pt core-shell nanoparticles in Comparative Example 1 were subjected to ultraviolet-visible light spectral scanning, and the spectr...

Embodiment 3

[0056] Example 3 The catalytic effect of preparing core-shell structures on ethanol fuel cells

[0057] 3.1 Chronoamperometric and cyclic voltammetry characteristics

[0058] Chronoamperometric and voltammetric characteristics of Au@Ag core-shell nanocubes, Au@AuPt core-shell nanostructures and Au@Pt core-shell nanoparticles in Comparative Example 1 were tested. The detection conditions were as follows: 1.0 M sodium hydroxide and 1.0 M ethanol mixed solution were mixed, the scanning voltage was -1V~0.6V, and the scanning speed was 50 mV / s.

[0059] Chronocurrent results such as image 3 As shown, the Au@AuPt core-shell nanocubes have 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 ethanol; Au@Au / Pt core ...

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Abstract

The invention discloses an Au@Au / Pt core-shell structure nano catalyst applied to alcohol fuel cells. The nano catalyst is in a concave cube shape, and the size is 29+ / -4nm; the inside of the nano catalyst is a gold core, and the outside of the nano catalyst is a gold / platinum shell. The catalyst is prepared by the following method which comprises the steps: firstly, preparing gold nanoparticles;then depositing silver on the surfaces of the gold nanoparticles to form an Au@Ag core-shell structure nano cube; then utilizing an in-situ growth method to prepare the Au@Ag / Au core-shell structure nano cube; finally, adding chloroplatinic acid to displace silver out to obtain a product. According to the catalyst disclosed by the invention, a pure platinum shell is changed into a shell prepared from platinum and gold jointly, so that platinum loading capacity is further reduced, and cost is reduced; meanwhile, the catalyst has an unique core-shell structure, has richer atom distribution and larger surface area, further interacts with the gold core to achieve a Plasmon resonance effect and can effectively enhance catalytic activity and weaken a poisonous effect; to alcohol oxidization reaction under the alkali condition, the nano catalyst has the advantages of better stability and catalytic activity.

Description

technical field [0001] The invention belongs to the field of fuel cell catalysts, and relates to an Au@Au / Pt nanocatalyst for alcohol fuel cells and a preparation method thereof. Background technique [0002] Alcohol fuel cells have the advantages of abundant fuel sources, low price, safe and convenient carrying and storage, etc. Among them, methanol fuel cells are widely studied. However, due to the toxicity of methanol, its application in mobile power sources such as mobile phones, notebooks, and computers is limited. As the simplest organic small molecule in chain alcohols, ethanol has the following advantages compared with methanol: first, it is cheap, safe, and non-toxic; second, it is easy to transport and has less volatility; third, its theoretical specific energy is high; four It is a wide-ranging source of renewable green energy. Therefore, the study of direct alcohol fuel cells using ethanol as fuel is not only of theoretical significance, but also has broad appl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92H01M8/1011B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/921H01M8/1011H01M8/1013Y02E60/50Y02P70/50
Inventor 赵振路曹琳冯煜王建荣杨萍
Owner UNIV OF JINAN
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