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Preparation of nano-structured DSA electrolytic electrode

A nanostructure, electrocatalysis technology, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems of non-dense electrode surface coating, low oxygen evolution potential, low specific surface area, etc., and achieve easy control and dense coating surface , the effect of increasing the specific surface area

Active Publication Date: 2007-01-17
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the problems that the DSA electrode obtained by the current preparation method has low oxygen evolution potential, the electrode surface coating is not dense, easy to fall off, and low specific surface area, the invention provides a method that can make the electrode have a higher oxygen evolution potential and the coating surface is dense. , The preparation method of the DSA electrocatalytic electrode of the nano structure that does not come off

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specific Embodiment approach 1

[0021] Embodiment 1: In this embodiment, on the basis of the papers published by the inventor, the influence of the usage amount of the complexing agent citric acid on the performance of the electrode is investigated in detail, and a set of experiments are designed:

[0022] keep SnCl 4 The concentration of the solution and ammonia water is 0.5mol / L unchanged, adding and SnCl 4 The molar ratios of citric acid were 0, 0.25:1, 0.5:1, 0.75:1, 1:1, and 1.5:1, respectively. 2 Preparation and performance study of nano-coating electrocatalytic electrodes”, the steps were prepared, heat treatment at 600 °C for 3 hours, and this process was repeated twice. Six electrodes were subjected to degradation experiments to investigate their effect on 100 mg / L phenol + 0.25 MNaSO 4 The degradation of the solution was followed by 4-aminoantipyrine spectrophotometry to track the change of phenol concentration during the degradation process. The solution volume is 100ml, and the current density...

specific Embodiment approach 2

[0045] Embodiment 2: The preparation method of the nanostructured DSA electrocatalytic electrode described in this embodiment includes the following detailed processes:

[0046] 1. Pretreatment of titanium substrate:

[0047] (1) Grinding: first grind with 40-mesh coarse sandpaper, then use 320-mesh fine sandpaper to make the surface of the titanium substrate appear silvery-white metallic luster, rinse with distilled water;

[0048] (2) Alkaline washing: then soak the titanium substrate with 40% NaOH solution by mass, heat it in a water bath at 95°C for 2 hours, and rinse it with distilled water;

[0049] (3) Pickling: soak the titanium substrate with oxalic acid solution with a content of 15% by mass, heat it in a water bath at 95°C for 2 hours, and rinse it with distilled water.

[0050] 2. Preparation process of sol to obtain precursors:

[0051] (1), weigh 0.44gSb 2 O 3 , add 3mL concentrated hydrochloric acid to dissolve it, add 7.6g citric acid (complexing agent) and...

specific Embodiment approach 3

[0058] Embodiment 3: The difference between this embodiment and the previous embodiment is that the following process is added between step a and step b in "B. Preparation of Sol ~10% rare earth nitrate or chloride, the rare earth is any one or any mixture of La, Ce, Pr, Nd, Sm, Eu, Gd, Dy.

[0059] The inventors have investigated the influence of various rare earth elements and the mixture of various rare earth elements on the performance of the electrode as a whole: the electrocatalytic performance of the electrode prepared by adding rare earth elements to the raw materials is not significantly improved, but the Doping increases the conductivity of the electrode, so that the electrode voltage drops under the condition of the same current density, thereby reducing the power consumption and improving the current efficiency. At the same time, the doping of rare earth elements also increases the oxygen evolution potential of the electrode.

[0060] Embodiment 4: The difference ...

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Abstract

A preparing process of a nanostructured DSA eletrocatalytic electrode aims at the problems of low potential of oxygen evolution, incompact and loose coating on the electrode surface and low specific sueface area at present. The preparing process of nanostructured DSA electrode provided by this invention includes the pretreatment of the Titanium substrate, the preparation of sol and the heat treatment of the surface nano-coating. By this process the electrode has a higher potential of oxygen evolution and a compact and fast coating. Compared with the electrodes in published papers, this preparing process improves the electrocatalytic ability significantly, reduces the degration time of equal amount of organic compounds by 33%, increases the oxygen evolution potential by 0.1V to above 1.9V(vs.SHE), elongates the lifespan of the electrode by two times and is convenient for spreading.

Description

technical field [0001] The invention relates to a preparation method of an electrode. Background technique [0002] DSA electrocatalytic electrodes are used in sulfuric acid and chlor-alkali industries, and their main functions are oxygen evolution and chlorine evolution. The current DSA electrodes have low oxygen evolution potential and poor catalytic degradation ability to organic substances. The electrocatalytic performance of the electrodes cannot meet the actual needs of wastewater treatment. , and the electrode surface coating is not dense, easy to fall off, and has a low specific surface area. The current DSA electrocatalytic electrode preparation method is complicated, and the mixing of raw materials is not uniform, thus affecting the quality of the final product. [0003] The inventor published "Titanium-based SnO" in "Materials Science and Technology" in April 2006. 2 "Preparation and performance research of nano-coated electrocatalytic electrodes", which disclos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/10
Inventor 冯玉杰刘峻峰
Owner HARBIN INST OF TECH
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