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Making method of platinum iridium oxide alloy electrode

A technology of alloy electrodes and oxides, which is applied in the direction of electrodes, electrolysis processes, electrolysis components, etc., can solve the problems of co-solubility price difference, failure to meet the service life requirements of electrode materials, and no report on the performance of oxidized electrolyzed water, etc., to achieve chlorine analysis. High catalytic activity, low cost of use, and long service life

Active Publication Date: 2015-01-21
武汉丽辉新技术有限公司
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Problems solved by technology

In addition, some researchers have introduced Pt elemental substance into IrO 2 Improve electrode stability, but metal Pt has a face-centered cubic structure, while IrO 2 It is a rutile structure, so there is a co-solubility difference between the two, and PtO 2 and IrO 2 Both are rutile structure, and it has a high oxygen evolution overpotential, if the PtO 2 Add to IrO 2 In this way, a better solid solution structure can be formed, thereby reducing the oxygen evolution activity of the electrode material, improving the chlorine evolution selectivity, and increasing the service life of the electrode
[0004] At present, there are very few studies on the preparation of anode electrode materials for oxidation electrolysis of water, among which Zeng Xinping et al. (Journal of Tongji University (Natural Science Edition), 2011, 39(9): 1318-1323) reported the preparation of RuO by thermal decomposition 2 -SnO 2 -TiO 2 The electrode, research shows that when the Ru content is 25%, its chlorine evolution activity is the best; but the life of the electrode strengthening test is only 105min, which cannot meet the actual use requirements, and the performance of the electrode for preparing oxidized electrolyzed water is not reported in the article
In 2012, Zeng Xinping et al. (Journal of Electroanalytical Chemistry 677–680 (2012) 133–138) studied the influence of Sn content on the electrolysis efficiency of the prepared oxidized electrolyzed water and the enhanced life of the electrode. The study showed that when the Sn content When the content is less than 10%, the electrolysis efficiency is higher; when the content is 5%, the life of the intensive test is the longest, but it is only 85min, which also cannot meet the actual use requirements
Although the actual service life of ruthenium-iridium electrodes is higher than that of platinum-titanium electrodes, it still does not meet the requirements of the national standard GB-28234-2011 on the service life of electrode materials (more than 3000h)

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  • Making method of platinum iridium oxide alloy electrode
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  • Making method of platinum iridium oxide alloy electrode

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[0024] The preparation process of the titanium-based platinum-iridium oxide alloy electrode of the present invention is as follows:

[0025] (1) Pretreatment of titanium substrate: sandblasting, degreasing, ultrasonic acid etching, cleaning, drying;

[0026] (2) Preparation of platinum dioxide: heat and stir the mixed solution of platinum salt and sodium nitrate at 55-65°C, evaporate and crystallize, dry, grind, and roast to obtain the mixture, then carry out sufficient wet grinding, and disperse in the solvent to obtain platinum dioxide Platinum solution; the metal ion concentration of platinum salt is 0.05-0.3mol L -1 , adding sodium nitrate concentration is 0.4-2.4mol L -1 ; The sintering process is sintering at 500° C. for 30 minutes.

[0027] (3) Configuration of the coating solution: disperse the iridium salt into the solvent, and then add the above-mentioned platinum dioxide solution so that the metal ion concentration is 0.05-0.3mol L -1 , and then adjust the pH val...

Embodiment 1

[0035] A 10cm×5cm TA1 titanium plate was first sandblasted, then washed with 10% sodium carbonate solution for 10 minutes under the action of ultrasonic waves to remove oil, then washed with deionized water under the action of ultrasonic waves, and then washed with 10wt% oxalic acid Activated at 96°C for 40min, finally rinsed with deionized water, dried in the air, and stored in absolute ethanol.

[0036] 2.590g H 2 PtCl 6 Dissolve in 50 mL of ethanol and isopropanol solvent with a volume ratio of 1:1, so that the concentration of metal ions in the solution is 0.1 mol L -1 , stir well. Then add 3.400 g of solid sodium nitrate to the solution, stir and heat to 60° C., and keep stirring until the solvent evaporates completely. The mixture was then completely dried in an oven at 80°C to obtain a dry salt mixture, which was thoroughly ground in an agate mortar to make it evenly mixed. Then bake in a tube furnace at 500 °C for 30 min with a heating rate of 5 °C min -1 , to obt...

Embodiment 2

[0050] A 10cm×5cm TA1 titanium plate was first sandblasted, then washed with 10% sodium carbonate solution for 10 minutes under the action of ultrasonic waves to remove oil, then washed with deionized water under the action of ultrasonic waves, and then washed with 10wt% oxalic acid Activated at 96°C for 40min, finally rinsed with deionized water, dried in the air, and stored in absolute ethanol.

[0051] 2.590g H 2 PtCl 6 Dissolve in 50 mL of ethanol and isopropanol solvent with a volume ratio of 1:1, so that the concentration of metal ions in the solution is 0.1 mol L -1 , stir well. Then add 3.400 g of solid sodium nitrate to the solution, stir and heat to 60° C., and keep stirring until the solvent evaporates completely. The mixture was then completely dried in an oven at 80°C to obtain a dry salt mixture, which was thoroughly ground in an agate mortar to make it evenly mixed. Then bake in a tube furnace at 500 °C for 30 min with a heating rate of 5 °C min -1 , to obt...

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Abstract

The invention discloses a making method of a platinum iridium oxide alloy electrode. The method includes the following steps: heating and stirring a platinum salt and sodium nitrate mixed solution to 55-65DEG C, carrying out evaporating crystallization, drying, grinding, calcining to obtain a mixture, washing the mixture by water to remove impurities, carrying out full wet grinding, and dispersing the wet ground mixture in a solvent to obtain a platinum dioxide solution; dispersing an iridium salt in the solvent, adding the platinum dioxide solution, adjusting the pH value to 14 by using sodium hydroxide, and dissolving and dispersing to obtain a coating solution; and coating a titanium plate with the coating solution, drying, calcining at 400-700DEG C, and cooling in air to obtain the platinum iridium oxide alloy electrode. The above platinum iridium oxide titanium anode electrocatalysis material prepared in the invention has the characteristics of fine crystsal grains and honeycomb shape; and the anodic chlorine evolution electrocatalytic activity is high, and the service life is long, so the electrode is suitable for preparing electrolyzed oxidizing water, and the use cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of electrode materials, and in particular relates to a preparation method of a platinum-iridium oxide alloy titanium anode. Background technique [0002] In the electrochemical industry, the key technology is the research and development of electrode materials in the electrolytic cell. The composition and structure of the anode material determine its electrochemical activity and stability. In the chlor-alkali industry, seawater electrolysis and oxidative electrolysis water preparation, the three are all realized by electrolysis of sodium chloride solution, but the concentration of sodium chloride solution is very different, respectively 25wt%, 2-5wt% and 0.05- 0.1wt%, such a large concentration difference causes the difference in electrocatalytic reaction type and electrolysis efficiency, so the requirements for anode materials will also be different. Especially in the preparation of oxidized electrolyzed w...

Claims

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Application Information

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IPC IPC(8): C25B11/10C25B11/08
Inventor 任占冬朱玉婵张奇刘晔吴祯祯
Owner 武汉丽辉新技术有限公司
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