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Acid resistant anode, and preparation method

An anode and electrode technology, applied in the field of electrochemical engineering, can solve the problems of high oxygen evolution overpotential, reduced conductivity, and low output, and achieve high catalytic activity, long life, and good conductivity

Inactive Publication Date: 2010-05-19
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of pure lead as the anode material has the following disadvantages: (1) the lead anode is soft, and it is prone to bending deformation during use, causing a short circuit; (2) the oxygen evolution overpotential is high and consumes a large amount of electric energy; During the process, the surface of lead will be oxidized to form lead dioxide, and in the tiny pores of lead dioxide, PbSO will be generated 4 Insulators, electrode resistance increases, and electrode life is shortened; (4) Anode corrosion products (lead ions) co-deposited at the cathode affect the purity of cathode products; then in the 1960s, a cheap and durable DSA (Dimensionally Stable Anode) born by application
However, considering the high cost of precious metals, small output, and limited reserves, it is more practical to develop non-noble metal oxide anodes; today, non-noble metal oxide electrodes mainly include titanium-based manganese dioxide, titanium-based lead dioxide, titanium-based Based on tin dioxide, titanium-based cobalt oxide and carbon-based oxide and other types, the main disadvantage of this type of anode is that during the electrolysis process, the oxygen released from the anode will passivate the titanium, resulting in an increase in electrode resistance and electrode failure.
Reported Ti / MO 2 In research, mostly Ti / MnO 2 and Ti / PbO 2 Anode, but there are obvious problems, mainly: (1) The formation of titanium dioxide insulating layer on the surface of titanium substrate reduces the conductivity
(2) The bonding force between the titanium substrate and the surface active layer is poor, causing the surface active layer to fall off, especially in highly corrosive acidic solutions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0025] use 120 # sandpaper and 1 # Polish the titanium plate with a length of 80mm, a width of 10mm and a thickness of 2mm with water sandpaper, and then treat it with a mixture of 10% NaOH solution, 20% oxalic acid and hydrochloric acid at 50°C for 3 hours, etch the titanium plate into a pitted surface, and put it in 3 % oxalic acid solution for later use.

[0026] 4.8gSnCl 4 ·5H 2 O, 0.2gSbCl 3 Dissolve in 10mL n-butanol, and add 1-2mL concentrated hydrochloric acid to prevent hydrolysis. Apply this solution on the treated titanium substrate, dry it at 100°C for 5 minutes, and then thermally decompose it at 450°C for 10 minutes. Repeat this 15 times, and wrap 0.6g of graphite fiber on the coated electrode for about 1 hour. 0.6g of carbon fiber powder, 7mL of absolute ethanol, and 0.05g of polytetrafluoroethylene were mixed into a paste and loaded on the electrode middle layer, then pressed in a mold with aluminum foil, and sintered at 500°C. That is, an electrode with ...

Embodiment approach 2

[0030] use 120 # sandpaper and 1 # Polish the titanium plate or titanium mesh with a length of 80 mm, a width of 10 mm and a thickness of 2 mm with water sandpaper, and then treat it with a mixture of 15% NaOH solution, 25% oxalic acid and hydrochloric acid at 60 ° C for 2 hours to etch the titanium plate into a pitted surface. Put into 3% oxalic acid solution for later use.

[0031] 1 g of graphite fiber was evenly loaded on the titanium plate, and then soaked in 10 mL of 50% Mn(NO3 ) 2 After being in the solution for 3s, bake at 100°C for 10min, and then calcined at 200°C for 10min, repeat this way 15 times to get Ti / CF / MnO 2 . This anode is under high current density (4A / cm 2 ) The expected service life is 70h.

Embodiment approach 3

[0033] use 120 # sandpaper and 1 # Polish the titanium plate with a length of 80mm, a width of 10mm and a thickness of 2mm with water sandpaper, and then treat it with a mixture of 15% NaOH solution, 15% oxalic acid and hydrochloric acid at 50°C for 2 hours, etch the titanium plate into a pockmarked surface, and put it in 3 % oxalic acid solution for later use.

[0034] 9.6gSnCl 4 ·5H 2 O, 0.4gSbCl 3 Dissolve it in 20mL of n-butanol, and add 2mL of concentrated hydrochloric acid to prevent hydrolysis. Apply this solution on the treated titanium substrate, dry it at 100°C for 5 minutes, and then thermally decompose it at 450°C for 10 minutes. Repeat this 15 times, and add 0.7g of graphite fiber to the coated electrode for about 1 hour. Then immerse the electrode in the coating solution prepared just now for 3-5 seconds, dry it at 110°C for 5 minutes, and then thermally decompose it at 450°C for 10 minutes. Repeat 10 times to get an electrode with an intermediate layer.

...

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Abstract

This invention relates to a method for preparing acid-resistant anode. The acid-resistant anode is composed of Ti as the matrix, SnO2 + Sb2O4 + graphite fibers as the intermediate buffer layer, and PbO2 or MnO2 as the active layer. The method adds highly conductive and acid-resistant graphite fibers into the intermediate buffer layer, thus the adhesiveness between the active layer and the intermediate buffer layer is improved, and the anode has high conductivity and service life in strong acid solution. The acid-resistant anode has such advantages as high acid resistance, long service life, high catalytic activity and wide applications.

Description

1. Technical field [0001] The invention relates to an acid-resistant anode and a preparation method thereof, which belong to the technical field of electrochemical engineering, and specifically relate to an electrode catalyst used in an electrolysis process and a preparation method thereof. 2. Background technology [0002] Because sulfuric acid solution has the advantages of high conductivity, stable properties and low price. Therefore, many electrochemical synthesis and other systems need to be carried out in sulfuric acid solution, such as non-ferrous metal smelting, chlor-alkali industry, organic electrosynthesis, etc. However, due to the strong corrosiveness of sulfuric acid solution and the strong oxidizing property of the nascent oxygen released from the anode, there is a shortage of anode materials suitable for industrial production. An ideal anode should have the characteristics of good electrical conductivity, high catalytic activity, long life, large surface area...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/04
Inventor 梁镇海孙彦平薛彩霞
Owner TAIYUAN UNIV OF TECH
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