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Preparation method and application of modified electrode based on nanoporous platinum-cobalt oxide hybrid material

A nanoporous, modified electrode technology, applied in the direction of material electrochemical variables, chemical instruments and methods, nanotechnology for materials and surface science, etc., can solve the problem of reducing electrocatalytic activity and specific surface area, and easy agglomeration of platinum nanoparticles , Increase the cost of nitrite, etc., to achieve the effect of low cost, low detection limit, and prevention of agglomeration

Active Publication Date: 2018-12-07
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The key problem in these studies is that platinum nanoparticles are prone to agglomeration during operation, which reduces their electrocatalytic activity and specific surface area, and the use of a large amount of noble metal platinum increases the cost of detecting nitrite, limiting large-scale applications.

Method used

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  • Preparation method and application of modified electrode based on nanoporous platinum-cobalt oxide hybrid material
  • Preparation method and application of modified electrode based on nanoporous platinum-cobalt oxide hybrid material
  • Preparation method and application of modified electrode based on nanoporous platinum-cobalt oxide hybrid material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1: Preparation of nanoporous platinum-cobalt oxide composite material

[0044] Melt pure aluminum, cobalt, platinum (85:14:1) at high temperature to form an alloy, and use cold rolling technology to make it into thin sheets during the cooling process; take 100mg of the alloy and corrode the aluminum in 0.1M sodium hydroxide solution, and use ultra-pure Washing with water until the cleaning solution is neutral, the nanoporous platinum-cobalt oxide composite material can be obtained, which is dried for use.

[0045] X-ray diffraction pattern (XRD) of the prepared nanoporous platinum-cobalt oxide composite ( figure 1 Middle a curve) shows that before dealloying, many diffraction peaks can be observed, which are attributed to metallic aluminum and Al x The face-centered cubic structure of the Co phase. During dealloying, aluminum is corroded by sodium hydroxide, while the more active cobalt is oxidized to cobalt oxide, which stabilizes each other with platinum....

Embodiment 2

[0046] Example 2: Preparation of Nanoporous Platinum-Cobalt Oxide Composite Modified Electrode

[0047] (1) Polishing and cleaning of glassy carbon electrodes

[0048] Rinse the glassy carbon electrode twice with ultrapure water, and then polish it with 0.5 μm and 0.05 μm alumina slurry for five minutes respectively, rinse off the slurry on the surface of the electrode with ultrapure water, and place it in ultrapure water for one minute. Rinse with ultrapure water and dry for later use.

[0049] (2) Electrode modification

[0050] Grind the dried nanomaterials to a uniform and fine powder, take 4mg of nanomaterial powder, 4mg of carbon powder, 300 μL of ethanol and 100 μL of Nafion solution for ultrasonic mixing until a uniform ink-like suspension is obtained. Take 3 μL of the suspension and apply it on the surface of the glassy carbon electrode, turn a beaker upside down, and let it dry until a uniform film is formed.

Embodiment 3

[0051] Embodiment 3: Modified electrode is used for the cyclic voltammetry scanning of sodium nitrite detection

[0052] (1) Preparation of sodium nitrite standard solution

[0053] Weigh 0.0138g of sodium nitrite powder and add 20mL of phosphate buffer (0.1M, pH=6.0) to dissolve to obtain a 0.01M sodium nitrite solution. Sodium nitrite solutions of other concentrations were prepared in this way.

[0054] (2) Cyclic voltammetry detection of sodium nitrite by modified electrode

[0055] attached image 3 The cyclic voltammograms (curve a) of the modified electrode in blank phosphate buffer (0.1M, pH6.0), the bare glassy carbon electrode (curve b) and the modified electrode (curve c) in a 0.01M sub- Cyclic voltammogram of sodium nitrate in phosphate buffer. The oxidation peak current of sodium nitrite on the modified electrode is much higher than that on the bare glassy carbon electrode, and the oxidation peak potential has shifted negatively, indicating that the modified na...

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Abstract

The invention relates to a food detection technology and particularly relates to a preparation method and application of a modified electrode based on nanoporous platinum-cobalt oxide hybrid material.The preparation method adopts a glassy carbon electrode as a base electrode. The surface of the base electrode is modified with the nanoporous platinum-cobalt oxide hybrid material, the nanoporous platinum-cobalt oxide hybrid material, carbon powder, ethanol and a Nafion solution are mixed under ultrasonic treatment to form a uniform ink-like suspension solution, and the ink-like suspension solution is added onto the polished surface of the glassy carbon electrode drop by drop and then is dried so that the modified electrode is obtained. The product detection process is fast, any sample labeling and probe modification are avoided, sensitivity is high and a detection limit is low. The hybrid material is a stable composition of nanoporous cobalt oxide and platinum nanoparticles, effectivelyprevents agglomeration of platinum nanoparticles, has a low platinum use amount and greatly reduces the cost of nitrite detection.

Description

(1) Technical field [0001] The invention relates to food detection technology, in particular to a preparation method and application of a modified electrode based on a nanoporous platinum-cobalt oxide hybrid material. (2) Background technology [0002] Nitrite is a commonly used food additive. In the production of meat products, it can maintain or enhance its bright red color and flavor, and can inhibit the growth of bacteria. However, after nitrite enters the human body, it will interact with the hemoglobin in the blood, and the ferrous iron in the protein will be oxidized to ferric iron to form methemoglobin, thereby inhibiting the normal oxygen carrying and releasing functions, leading to tissue hypoxia and poisoning. At present, there are mainly colorimetric methods for laboratory detection of nitrite in food (see Baiya Wang, Zhenglong Wu, Weidong Qin, Polyamidoamine dendrimer-armed fluorescent magnetic nanoparticles for sensitive and selective determination of nitrite i...

Claims

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Application Information

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IPC IPC(8): G01N27/416G01N27/30G01N27/48B82Y30/00B01J23/89
CPCB01J23/002B01J23/8913B82Y30/00G01N27/308G01N27/4168G01N27/48
Inventor 卢璐崔波
Owner QILU UNIV OF TECH
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