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Preparation method of long-life DSA (Dimension Stable Anode) electrode

A long-life, electrode technology, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems of reducing catalytic efficiency, increasing energy consumption, reducing electrode conductivity, etc., achieving simple process, improving service life, and improving catalytic activity. Effect

Inactive Publication Date: 2013-06-12
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existence of the titanium dioxide layer also reduces the conductivity of the electrode, increases energy consumption and reduces catalytic efficiency.
Other studies have shown that coating an intermediate layer containing Mn, Co, Ru and other elements between the substrate and the active layer can improve the life of the electrode, but the doping of these elements will also reduce the catalytic activity of the electrode.

Method used

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  • Preparation method of long-life DSA (Dimension Stable Anode) electrode
  • Preparation method of long-life DSA (Dimension Stable Anode) electrode
  • Preparation method of long-life DSA (Dimension Stable Anode) electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0017] (1) Cut a titanium sheet with a thickness of 250 μm into 3×4cm 2 After being polished and washed with alkali, they were put into 10wt% oxalic acid, etched in a water bath at 100°C for 3 hours, then rinsed with deionized water and dried to obtain a titanium sheet with a clean surface.

[0018] (2) With the treated titanium sheet as the cathode and the stainless steel sheet as the anode, first put the 3 citric acid solution at 15mA / cm 2 Electroplating at a current density of 2min, and then transferred to a solution containing 0.09M SnCl 4 in sulfuric acid solution at 20mA / cm 2 Electroplating at a current density of 20min; repeat the above steps twice, rinse and dry it and bake it at 500°C for 2h.

[0019] (3) Configure a n-butanol solution with a Sn:Sb:Ce molar ratio of 100:10:3, use the dipping and pulling method to evenly coat the active layer on the surface of the titanium sheet with the intermediate layer plated, and dry it at 120°C. Heat treatment at 450°C for 10...

Embodiment 2

[0022] (1) Cut a titanium sheet with a thickness of 250 μm into 3×4cm 2 After polishing and alkaline washing, put them into 10wt% oxalic acid, etch in a water bath at 100°C for 3 hours, then rinse them with deionized water and dry them to obtain a titanium sheet with a clean surface, which is then used as an anode , nickel sheet as the cathode, in the HF, H 2 O and CH 3 Anodized at a voltage of 20V for 20min in an electrolyte composed of COOH, and calcined at 500°C for 3h.

[0023] (2) The titanium sheet treated in step (1) is used as the cathode, and the stainless steel sheet is used as the anode, and the titanium sheet containing 0.01M SbCl 3 and 0.1M SnCl 4 In the citric acid solution, at 10mA / cm 2 Electroplating at a current density of 1h, rinsed and dried, then baked at 500°C for 2h.

[0024] (3) Configuration Sn: Sb: Ce molar ratio is the ethylene glycol solution of 100:10:3, the active layer is evenly brushed on the surface of the titanium plate that has electropla...

Embodiment 3

[0027] (1) Cut the titanium mesh into 2×2cm 2 After ultrasonic degreasing by alkaline cleaning, put it into 10wt% oxalic acid, etch in a water bath at 100°C for 3 hours, then rinse it with deionized water and dry it to obtain a titanium mesh with a clean surface.

[0028] (2) The titanium mesh treated in step (1) is used as the cathode, and the stainless steel sheet is used as the anode, and the titanium mesh containing 0.01M SbCl 3 and 0.1M SnCl 4 In the citric acid solution, at 10mA / cm 2 Electroplating at a current density of 1h, rinsed and dried, then baked at 500°C for 2h.

[0029] (3) The titanium mesh electroplated with the tin-antimony intermediate layer was used as the anode, and the clean titanium mesh of the same size was used as the cathode. Under the condition of 40°C water bath, the titanium mesh was heated at 20mA / cm in a saturated NaOH solution of PbO. 2 The current density electrodeposition 1h; then containing 0.5MPb (NO 3 ) 2 and 40mMNaF nitric acid solut...

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Abstract

The invention provides a preparation method of a long-life DSA (Dimension Stable Anode) electrode. The preparation method comprises the steps of: by taking metallic titanium or titanium alloy as a matrix, carrying out certain surface treatment on the matrix; by taking the matrix as the negative pole, carrying out constant-current electroplating for a certain time in a solution containing Sn<4+> and Sb<3+> to obtain a compact electroplating intermediate layer; and finally uniformly coating an active layer on the surface of the intermediate layer. The preparation method provided by the invention is simple in process and convenient for operation and has the advantages that the large-scale production can be easily realized; the prepared DSA electrode is capable of effectively preventing dissolved oxygen from spreading into the matrix and passivating the matrix; and the service life of the electrode is greatly prolonged.

Description

technical field [0001] The invention relates to the preparation of a DSA electrode. Specifically, a dense tin-antimony intermediate layer is electroplated on the substrate first, and then an active layer is coated. The existence of the dense electroplating intermediate layer can effectively prevent dissolved oxygen from entering the substrate. Diffusion, slow down the process of electrode passivation, so as to achieve the purpose of improving the life of the electrode. Background technique [0002] The shape-stable anode, that is, the DSA electrode, is an electrode composed of titanium-based metal oxides coated with active elements such as Ir, Pt, Ru, and Sn. It has the advantages of high catalytic activity, good reaction selectivity, and corrosion resistance. DSA electrode not only overcomes some shortcomings of traditional graphite electrode, platinum electrode, lead-based alloy electrode, lead dioxide electrode, etc., but also can design the composition and structure of e...

Claims

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Application Information

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IPC IPC(8): C25B11/00C25C7/02C25D17/10
Inventor 周幸福邵长林
Owner NANJING UNIV OF TECH
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