Ti-based iridic oxide coating electrode and preparation method thereof

A technology of coating electrodes and iridium dioxide, applied in chemical instruments and methods, electrodes, separation methods, etc., can solve the problems of high consumption of precious metals, increase electrode activity, easy falling off of active layers, etc., and achieve low consumption of precious metals, Improves the strengthening life and the effect of grain stress relaxation

Active Publication Date: 2018-03-23
SHANGHAI TECHASE ENVIRONMENT PROTECTION +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In view of the above defects or improvement needs of the prior art, the present invention provides a titanium-based iridium dioxide coated electrode and a preparation method thereof. Apply double active layers to increase electrode activity, and increase doping elements in the active layer to reduce the amount of precious metal iridium, and then add a protective layer of tantalum chloride to protect the active layer. By adjusting the ratio of Ir and Sn, the ratio of Ir and Ta And the dosage, thereby solving the existing technical problems that the active layer is easy to fall off, the consumption of precious metals is high, and the service life is short

Method used

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preparation example Construction

[0039] The invention provides a method for preparing a titanium-based iridium dioxide coated electrode, comprising the following steps:

[0040] (1) Spray-coat the supporting substrate layer paint onto a titanium plate with a temperature of 350 to 500°C to obtain a titanium-based supporting substrate layer, which is a conductive film layer; the supporting substrate layer coating is made of SnCl 2 2H 2 O and SbCl 3 It is prepared by dissolving in an organic solvent at a molar ratio of 7:1 to 10:1, and then adding concentrated hydrochloric acid; the concentration of the tin ion is 0.1-0.25 mol / L; the organic solvent is preferably n-butanol.

[0041] (2) Coating slurry A containing iridium ions and tin ions and coating slurry B containing iridium ions and tantalum ions are successively applied to the titanium plate coated with a thin layer of support substrate after cooling in step (1) on the titanium plate, so that it is evenly distributed on the titanium plate, and the coatin...

Embodiment 1

[0049] A titanium-based iridium dioxide-coated electrode, which includes a titanium base, a conductive film layer, and an IrO2 coating from bottom to top. 2 -SnO 2 layer, IrO 2 -TaO 2 layer and tantalum chloride layer, the conductive film layer is SnCl 2 -SbCl 2 layer, wherein the molar ratio of tin to antimony is 9:1; IrO 2 -SnO 2 The iridium content per square meter of the layer is 3.2g, and the molar ratio of iridium to tin is 1:3; IrO 2 -TaO 2 The iridium content per square meter of the layer is 2.8g, the molar ratio of iridium element to tantalum element is 7:3, and the tantalum chloride layer contains 0.4g of tantalum per square meter.

[0050] The above-mentioned method for preparing a titanium-based iridium dioxide coated electrode comprises the following steps:

[0051] Step 1: Dissolve SnCl2 2H2O and SbCl3 in n-butanol at a molar ratio of 9:1, add a few drops of concentrated hydrochloric acid to prevent hydrolysis, thereby making a supporting substrate coatin...

Embodiment 2

[0059] A titanium-based iridium dioxide-coated electrode, which includes a titanium base, a conductive film layer, and an IrO2 coating from bottom to top. 2 -SnO 2 layer, IrO 2 -TaO 2 layer and tantalum chloride layer, the conductive film layer is SnCl 2 -SbCl 2 layer, wherein the molar ratio of tin to antimony is 8:1; IrO 2 -SnO 2 The iridium content per square meter of the layer is 2.8g, and the molar ratio of iridium to tin is 1:2; IrO 2 -TaO 2 The iridium content per square meter of the layer is 3.2g, the molar ratio of iridium element to tantalum element is 1:1, and the tantalum chloride layer contains 0.2g of tantalum per square meter.

[0060] The above-mentioned method for preparing a titanium-based iridium dioxide coated electrode comprises the following steps:

[0061] Step 1: Dissolve SnCl2 2H2O and SbCl3 in n-butanol at a molar ratio of 8:1, add a few drops of concentrated hydrochloric acid to prevent hydrolysis, thereby making a supporting substrate coatin...

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Abstract

The invention belongs to the field of electrode preparation, and particularly relates to a Ti-based iridic oxide coating electrode and a preparation method thereof. The Ti-based iridic oxide coating electrode sequentially comprises a titanium substrate, a supporting substrate layer, an active layer A, an active layer B and a capping layer from bottom to top. The supporting substrate layer is a conductive thin film layer. The active layer A is an IrO2-SnO2 layer. The active layer B is an IrO2-TaO2 layer. The capping layer is a tantalum chloride layer. The content of iridium in each square meterof the IrO2-SnO2 layer is 2-4g. The content of iridium in each square meter of the IrO2-TaO2 layer is 2-4g. The preparation technology of the electrode is simple, operation is convenient, and composite cost is low. The prepared electrode fully plays the catalytic effect of iridium oxide, the electrode can achieve good stability under the action of the thin supporting substrate layer and the top protection layer, the service life is long, a base body titanium material can be used repeatedly, and the Ti-based iridic oxide coating electrode can operate under the high-temperature and high electric current density conditions.

Description

technical field [0001] The invention belongs to the field of electrode preparation, and more specifically relates to a titanium-based iridium dioxide coated electrode and a preparation method thereof. Background technique [0002] Traditional graphite anodes and lead-based alloy anodes have hindered the development of many industries such as chemical industry, metallurgy, protection, electroplating, etc. due to high energy consumption, short lifespan or high pollution. People have turned to research on new coated electrodes with low energy consumption and long lifespan. [0003] IrO 2 The oxygen evolution catalytic activity is second only to ruthenium oxide, and its chemical stability in acidic solution is higher than that of ruthenium oxide, so IrO with good physical and electrochemical properties 2 Coated titanium anodes have become a hot spot in the research field of dimensionally stable anodes. IrO 2 Coated titanium anode is a good oxygen evolution anode. Its advantag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/08C25B11/10C25D17/12C23F13/16C25D1/04C02F1/461C02F1/469B01D61/42
CPCB01D61/42C02F1/46109C02F1/469C02F2001/46138C23F13/16C25D1/04C25D17/12C25B11/093
Inventor 吴旭吕航刘道广孙钢范韦聚才张艳琳王芳古月圆
Owner SHANGHAI TECHASE ENVIRONMENT PROTECTION
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