Method for manufacturing acid resistant anode

An anode and hydrochloric acid technology, applied in the field of electrochemical engineering, can solve the problems of low output, high oxygen evolution overpotential, and affecting the purity of cathode products, etc., and achieve the effect of strong acid resistance and high catalytic activity

Inactive Publication Date: 2008-08-27
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 subsequent use;

[0026] Put the pretreated titanium matrix cathode and graphite source into the vacuum chamber of the double-layer glow ion metal infiltration furnace, and the rare earth element Y infiltration agent is suspended in the vacuum chamber, and the vacuum is evacuated to 5×10 -3 Pa, introduce argon gas to make the partial pressure reach 100Pa, control the bias voltage of the titanium substrate to 700V, the temperature of the titanium substrate to 950°C, and the source voltage to 1200V.

[0027] 4.8g SnCl 4 ·5H 2 O, 0.2g SbCl 3 Dissolve in 10mL n-butanol, add 1~2mL concentrated hydrochloric acid to prevent hydrolysis, ...

Embodiment approach 2

[0031] 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 subsequent use;

[0032] Put the pretreated titanium matrix cathode and graphite source into the vacuum chamber of the double-layer glow ion metal infiltration furnace, and the rare earth element Y infiltration agent is suspended in the vacuum chamber, and the vacuum is evacuated to 5×10 -3 Pa, introduce argon gas to make the partial pressure reach 100Pa, control the bias voltage of the titanium substrate to 700V, the temperature of the titanium substrate to 950°C, and the source voltage to 1200V.

[0033] 4.8g SnCl 4 ·5H 2 O, 0.2g SbCl 3 Dissolve in 10mL n-butanol, add 1~2mL concentrated hydrochloric acid to prevent hydrolysis, ...

Embodiment approach 3

[0036] 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 subsequent use;

[0037] Put the pretreated titanium matrix cathode and graphite source into the vacuum chamber of the double-layer glow ion metal infiltration furnace, and the rare earth element Y infiltration agent is suspended in the vacuum chamber, and the vacuum is evacuated to 5×10 -3 Pa, a mixture of argon and nitrogen (5:5) was introduced to make the partial pressure reach 50Pa, the bias voltage of the titanium substrate workpiece was controlled to 600V, the temperature of the titanium substrate was 820°C, the source voltage was 1200V, and in the case of rare earth element Y infiltration Under the infiltration of C and N on ...

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PUM

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Abstract

The invention relates to a method for preparing an acid-proof anode which belongs to the electrochemical engineering technical field and in particular relates to electrode catalyst which is used in an electrolysis process and a method for preparing the electrode catalyst. The acid-proof anode is characterized in that the acid-proof anode is composed of a titanium substrate, an interlayer of solid solution and an activated layer, the anode is the acid-proof anode which co-diffuses one, two or three of B, C and N to the titanium substrate under the condition of rare-earth catalysis, simultaneously, the invention provides anode material which has long service life, good electro-catalytic activity, good wear resistance and good corrosion resistance in sulfuric acid solution, and the anode material is in particular suitable in electrolysis production which has oxygen evolution and organic electrolysis process.

Description

1. Technical field [0001] The preparation method of the acid-resistant anode of the invention belongs to the technical field of electrochemical engineering, and specifically relates 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, low price, and lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/06
Inventor 陈兴国梁镇海
Owner TAIYUAN UNIV OF TECH
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