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Method for measuring and calculating HPbO2<-> oxidation reaction rate constant and diffusion coefficient in alkaline solution

A technology of oxidation reaction rate and alkaline solution, applied in the direction of electrochemical variables of materials, etc., can solve the problems of polarization curve correspondence, weak regularity of polarization curve peak changes, etc.

Inactive Publication Date: 2016-06-15
KUNMING UNIV OF SCI & TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Due to the limitations of the solution system and test parameters, the peak value of the polarization curve cannot correspond to a single reaction well, and the change regularity of the peak value of the polarization curve with the rotational angular velocity is weak, which limits the ability of HPbO in alkaline solution 2 - Accuracy of Oxidation Reaction Rate Constants and Diffusion Coefficients
At present about HPbO in alkaline solution 2 - The calculation method of oxidation reaction rate constant has not been reported yet

Method used

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  • Method for measuring and calculating HPbO2&lt;-&gt; oxidation reaction rate constant and diffusion coefficient in alkaline solution
  • Method for measuring and calculating HPbO2&lt;-&gt; oxidation reaction rate constant and diffusion coefficient in alkaline solution
  • Method for measuring and calculating HPbO2&lt;-&gt; oxidation reaction rate constant and diffusion coefficient in alkaline solution

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Such as figure 1 As shown, the HPbO in the alkaline solution 2 - The calculation method of oxidation reaction rate constant and diffusion coefficient, its specific steps are as follows:

[0026] (1) Firstly, a three-electrode system is adopted and the Pt disk electrode is placed on HPbO 2 - In the alkaline solution, the speed was adjusted to 2500rpm until the air bubbles on the surface of the Pt disk electrode were removed, and then the speed of the Pt disk electrode was 400rpm, 600rpm, 800rpm, 1000rpm, 1200rpm, 1400rpm, 1600rpm, 1800rpm and 2000rpm to obtain 10 strips Test the anodic polarization curve, and the obtained test anodic polarization curve is as follows figure 2 shown; where the working electrode has a surface area of ​​0.196cm 2 The Pt disc electrode, the reference electrode is a saturated calomel electrode, and the auxiliary electrode is a surface area of ​​2cm 2 Platinum chip, scanning range: -0.2~1.8V, scanning speed: 50mV / s, solution temperature ...

Embodiment 2

[0029] Such as figure 1 As shown, the HPbO in the alkaline solution 2 - The calculation method of oxidation reaction rate constant and diffusion coefficient, its specific steps are as follows:

[0030] (1) Firstly, a three-electrode system is adopted and the Pt disk electrode is placed on HPbO 2 - In the alkaline solution, the speed was adjusted to 2500rpm until the air bubbles on the surface of the Pt disk electrode were removed, and then the speed of the Pt disk electrode was 400rpm, 600rpm, 800rpm, 1000rpm, 1200rpm, 1400rpm, 1600rpm, 1800rpm and 2000rpm to obtain 10 strips Test the anodic polarization curve, and the obtained test anodic polarization curve is as follows Figure 4 shown; where the working electrode has a surface area of ​​0.196cm 2 The Pt disc electrode, the reference electrode is a saturated calomel electrode, and the auxiliary electrode is a surface area of ​​2cm 2 Platinum chip, scanning range: -0.2~1.8V, scanning speed: 50mV / s, solution temperature ...

Embodiment 3

[0033] Such as figure 1 As shown, the HPbO in the alkaline solution 2 - The calculation method of oxidation reaction rate constant and diffusion coefficient, its specific steps are as follows:

[0034] (1) Firstly, a three-electrode system is adopted and the Pt disk electrode is placed on HPbO 2 - In the alkaline solution, the speed was adjusted to 2500rpm until the air bubbles on the surface of the Pt disk electrode were removed, and then the speed of the Pt disk electrode was 400rpm, 600rpm, 800rpm, 1000rpm, 1200rpm, 1400rpm, 1600rpm, 1800rpm and 2000rpm to obtain 10 strips Test the anodic polarization curve, and the obtained test anodic polarization curve is as follows Figure 6 shown; where the working electrode has a surface area of ​​0.196cm 2 The Pt disc electrode, the reference electrode is a saturated calomel electrode, and the auxiliary electrode is a surface area of ​​2cm 2 Platinum sheet, scanning range: -0.2~1.8V, scanning speed: 50mV / s, solution temperature...

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Abstract

The invention relates to a method for measuring and calculating an HPbO2<-> oxidation reaction rate constant and diffusion coefficient in an alkaline solution, and belongs to the technical field of preparation of lead oxide. The method comprises the steps: firstly, adopting a three-electrode system, placing a Pt disk electrode in an alkaline solution of HPbO2<->, then adjusting the rotating speed of the Pt disk electrode, and obtaining tested anode polarization curves at the speed; selecting corresponding current values when a potential is 0.7 V in the rotation speeds of the Pt disk electrode from the tested anode polarization curves obtained from different rotation speeds of the Pt disk electrode, and carrying out linear fitting of reciprocals I<-1> of the current values with reciprocals [omega]<-1 / 2> of the square roots of rotation angular speeds of the Pt disk electrode, wherein a fitting straight line is represented by a Koutecky-Levich equation I<-1>=(nAFKC)<-1>+1.61(nAFC)<-1>D<-2 / 3>[nu]<1 / 6>[omega]<-1 / 2>; and measuring and calculating to obtain an intercept value H and a slope value S of the fitting straight line, and respectively calculating the reaction rate constant K and the diffusion coefficient D. The measuring and calculating method can relatively accurately test the HPbO2<-> oxidation reaction rate constant and diffusion coefficient in the alkaline solution.

Description

technical field [0001] The present invention relates to a kind of HPbO in alkaline solution 2 - The invention relates to a method for measuring and calculating oxidation reaction rate constants and diffusion coefficients, belonging to the technical field of lead oxide preparation. Background technique [0002] PbO 2 There are mainly two crystal forms of α and β, and the electrodeposited in alkaline solution is mainly α-PbO of orthorhombic crystal form (Orthorhombic) 2 , α-PbO 2 The structure is dense, and it is often used as an intermediate layer to enhance the bonding force between composite coatings. Electrochemical research using a rotating disk electrode is a method that combines hydrodynamics and electrochemistry. [0003] The present invention synthesizes PbO by using a rotating disc electrode 2 During the process, HPbO in alkaline solution 2 - The oxidation reaction rate constant reflects the speed of the chemical reaction. The calculated reaction rate constan...

Claims

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Application Information

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IPC IPC(8): G01N27/26
CPCG01N27/26
Inventor 徐瑞东何世伟王军丽韩莎王炯
Owner KUNMING UNIV OF SCI & TECH
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