A kind of au@pt core-shell type ultramicro electrode and preparation method thereof

An ultra-micro electrode, core-shell technology, which is applied in the fields of electrochemical variables of materials, material analysis by electromagnetic means, instruments, etc., can solve the problems of high cost and long time, and achieve low cost, short time and simple operation. Effect

Active Publication Date: 2020-10-16
SHAANXI NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the technical problems of high cost and time-consuming preparation methods of existing binary alloy nanoparticles, and the need to assist various instruments, the present invention provides a preparation method and application of Au@Pt core-shell type ultramicroelectrodes. The invention is based on the characteristics of a large difference in the melting point of gold and platinum, using the physical fusion method to melt and disperse gold on the surface of platinum micro-wires, and produce Au@Pt core-shell ultra-micro electrode catalytic materials

Method used

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  • A kind of au@pt core-shell type ultramicro electrode and preparation method thereof
  • A kind of au@pt core-shell type ultramicro electrode and preparation method thereof
  • A kind of au@pt core-shell type ultramicro electrode and preparation method thereof

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Embodiment 1

[0034] A method for preparing an Au@Pt core-shell ultramicroelectrode, the schematic diagram of which is shown in Figure 1, includes the following steps:

[0035] Step 1) take a gold wire with a diameter of 25 μm, and wind it densely on a platinum wire with a diameter of 25 μm to obtain a gold-platinum wire;

[0036] Step 2) Cut out a small section of the dense gold-platinum wire wrapped with gold wire in step 1, about 1 to 2 cm long, stick it to the end of the tungsten wire with conductive silver paste, and put it in a constant temperature to dry oven (35°C-60°C, 15min-30min), after the conductive silver paste is dried, then coat the surface coated with conductive silver paste with a layer of insulating and high-temperature-resistant epoxy resin glue, so that the gold-platinum wire is more Firmly stick to the tungsten wire;

[0037] Step 3) Place the gold-platinum wire sticking to the tungsten wire in step 2 on the outer flame of the alcohol lamp. Because the melting point o...

Embodiment 2

[0040] Such as figure 2 As shown, an Au@Pt core-shell ultramicroelectrode includes a tungsten wire 1, a conductive colloid layer 2 and an Au@Pt core-shell 3, and one end of the tungsten wire passes through the conductive colloid layer 2 and the Au@Pt core-shell One end of the body 3 is glued and fixed, the conductive adhesive layer is coated with insulating colloid, and the Au@Pt core shell is electroplated with an insulating layer.

[0041] image 3 and Figure 4 They are micrographs of Au@Pt core-shell ultramicroelectrodes with different gold / platinum ratios prepared in the present invention and their cyclic voltammograms in 1 mmol / L ferrocene methanol solution. From image 3 and Figure 4 It can be seen from the figure that the present invention can obtain Au@Pt core-shell ultramicrodisk electrodes with different gold / platinum ratios by cutting different parts of the Au@P core-shell. The radii of the Au@Pt core-shell ultramicroelectrodes a to d obtained in this experi...

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Abstract

The invention relates to a preparation method and application of an Au@Pt core-shell type ultramicroelectrode. The method includes S1) a step of winding a gold wire around a platinum wire to obtain agold-platinum wire; S2) a step of sticking the gold-platinum wire to a tungsten wire: S3) a step of heating and melting, namely a step of putting a product of the step S2) on high temperature outer flame, and allowing the platinum wire to be covered with the gold wire after the gold wire is melted to obtain an Au@Pt core-shell body; and S4) a step of electroplating the core-shell body with an insulating layer. The method overcomes a technical problem that existing preparation methods for binary alloy nanoparticles are high in cost and time-consuming and require a plurality of instruments as assistance. Based on a characteristic that gold and platinum have a large difference in melting point, the gold is melted by utilizing a physical melting method and dispersed onto the surface of a platinum microwire to prepare a Au@Pt core-shell type ultramicroelectrode catalytic material.

Description

technical field [0001] The invention belongs to the field of ultramicro electrodes, and in particular relates to a preparation method and application of an Au@Pt core-shell type ultramicro electrode. Background technique [0002] Compared with conventional large electrodes, ultra-micro electrodes have unique properties such as small electrode size, fast mass transfer speed, small time constant, and easy to reach a steady state, and have been widely used in many fields, such as single-cell detection, fast heterogeneous electron The detection of transfer rate, the detection of trace substances, etc. In addition, ultra-micro electrodes are often used as electrocatalysts in the fields of biosensing and fuel cells. However, the electrocatalytic activity of a single ultramicroelectrode catalyst is often low, and it is easily poisoned by the intermediate products of the reaction, resulting in a further decrease in its activity. For example, when pure Pt catalysts catalyze the oxid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/407G01N27/30
CPCG01N27/30G01N27/4076
Inventor 郭志慧唐丽芳郑行望
Owner SHAANXI NORMAL UNIV
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