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A kind of titanium electrode and its preparation method and application
Active Publication Date: 2021-11-23
GUANGDONG INST OF RARE METALS
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[0003] At present, the short working life of tin oxide electrodes commonly used in coated titanium electrodes severely limits their large-scale application.
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[0027] In addition, the present application also provides a method for preparing the above-mentioned titanium electrode, which may include the following steps: preparing a silver interlayer on the surface of the titanium substrate, and setting a bismuth titanium tin active layer on the surface of the silver interlayer away from the titanium substrate , followed by annealing.
[0028] Wherein, the preparation of the silver intermediate layer includes: using methods such as magnetron sputtering, electroplating, evaporation coating or chemical vapor deposition to cover silver on the surface of the titanium substrate to form a silver intermediate layer of required thickness.
[0029] In some embodiments, before the silver interlayer is provided, pretreatment of the titanium substrate is also included. The pretreatment may include, for example: grinding or sandblasting the titanium substrate, alkali washing and pickling.
[0030] As an option, grinding may be repeated rubbing the ...
Embodiment 1
[0040] Titanium substrate pretreatment:
[0041] The titanium substrate was repeatedly polished with 80-grit and 400-grit sandpaper in turn until the titanium plate showed a metallic luster. The polished titanium substrate was ultrasonicated with deionized water for 10 min, then placed in 40 wt% NaOH solution, and heated for 1 h in a water bath at 95°C. After alkali washing, the titanium sheet was taken out and ultrasonicated with deionized water for 10 minutes, then the titanium sheet was placed in 50 vol% HCl solution, and kept in a water bath at 90° C. for 1 hour. After pickling, it was ultrasonically cleaned with deionized water, and then dried with nitrogen flow.
[0042]Preparation of the middle layer:
[0043] A silver intermediate layer with a thickness of 100nm was prepared on the treated titanium substrate by magnetron sputtering. The background vacuum during deposition is 4.5×10 -4 Pa, the flow rate of argon gas is 20sccm, and the working pressure is controlled ...
Embodiment 2
[0048] Titanium substrate pretreatment:
[0049] The titanium substrate was sandblasted with 220 mesh quartz sand. The sandblasted titanium substrate was ultrasonicated with deionized water for 10 minutes, then placed in acetone solution, and ultrasonicated for 40 minutes. After degreasing, the titanium sheet was taken out and ultrasonicated with deionized water for 10 minutes, and then the titanium sheet was placed in a 10 wt% oxalic acid solution and kept in a water bath at 95° C. for 1 hour. After pickling, the titanium plates were ultrasonically cleaned in deionized water, and then dried with nitrogen flow for later use.
[0050] Preparation of the middle layer:
[0051] A silver intermediate layer with a thickness of 1000nm is prepared on the treated titanium substrate by electrodeposition. Silver foil with a purity of 99.99% is used as the anode, the titanium substrate is used as the cathode, and the electrolyte is a mixed solution of silver chloride (30g / L), potassiu...
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Abstract
The invention provides a titanium electrode and its preparation method and application, which belong to the technical field of electrodes. The titanium electrode comprises a titanium substrate, a silver intermediate layer and a bismuth-titanium-tin active layer; the silver intermediate layer is arranged on the surface of the titanium substrate, and the bismuth-titanium-tin active layer is arranged on the surface of the silver intermediate layer away from the titanium substrate. The titanium electrode has a higher oxygen evolution potential and a longer working life. The preparation method includes: preparing a silver intermediate layer on the surface of the titanium substrate, setting a bismuth titanium tin active layer on the surface of the silver intermediate layer away from the titanium substrate, and then performing annealing treatment. The method has the advantages of simple process, good repeatability and easy operation, and can effectively delay the passivation speed of the titanium substrate, prolong the working life of the electrode, and at the same time make the electrode have a higher oxygen evolution potential. The titanium electrode can be used in various waste water treatment environments, and can effectively degrade pollutants in waste water.
Description
technical field [0001] The invention belongs to the technical field of electrodes, and in particular relates to a titanium electrode and its preparation method and application. Background technique [0002] Coated titanium electrodes, also known as shape-stable anodes, are widely used in many fields such as chlor-alkali industry, wastewater treatment, electroplating, and cathodic protection. [0003] Currently, tin oxide electrodes commonly used in coated titanium electrodes have a short working life, which severely limits their large-scale applications. [0004] Therefore, it is necessary to develop a new coated titanium electrode that can replace the tin oxide electrode. Contents of the invention [0005] One of the objectives of the present invention includes providing a titanium electrode which has a higher oxygen evolution potential and a longer working life. [0006] The second object of the present invention includes providing a preparation method of the above-men...
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