Tin-antimony oxide coating titanium anode material for electrosynthesis of ferrate

A technology of oxide coating and ferrate, which is applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the hidden dangers of batteries with sealed structure, low generation potential, carcinogenicity and other problems, and achieve simple and mature preparation process and technology, mechanical strength High, low-cost effect

Inactive Publication Date: 2005-11-23
BEIJING INSTITUTE OF TECHNOLOGYGY +1
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Problems solved by technology

However, the existing research shows that the preparation of ferrate by electrochemical method is electrochemically oxidized with elemental metal iron as the raw material, which is inconsistent with the product formed after the discharge of ferrate is completed; another problem is also the current The biggest obstacle is that the potential of oxygen evolution reaction in strong alkaline aqueous solution is lower than that of ferrate (thermodynamic sequence), which means that ferric iron is not oxidized to hexavalent iron when the high-iron battery is charged. , but it is equivalent to electrolyzing water (generating oxygen, which brings great hidden dangers to sealed structure batteries), so, in order to use electrochemical methods to regenerate ferrate, many special conditions must be met, the most important ones are: ferrate Regenerative electrode materials should have excellent electrochemical stability and excellent selective electrochemical oxidation performance for ferrate
[0003] From the principle of sewage treatment, the current electrochemical treatment method uses hypochlorous acid as the electrogenerated oxidant, but it has been found that ferrate has advantages that hypochlorous acid does not have, such as not making the treated sewage Contains chlorinated substances, which often have certain toxicity and carcinogenic potential

Method used

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  • Tin-antimony oxide coating titanium anode material for electrosynthesis of ferrate
  • Tin-antimony oxide coating titanium anode material for electrosynthesis of ferrate

Examples

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Effect test

Embodiment 1

[0026] Tin antimony oxide coating anode material: the synthesis condition is Sn:Sb=57~5:1 (mol ratio), after drying by infrared lamp and burning at 150~1050°C. respectively containing Fe(OH) 3 and does not contain Fe(OH) 3Cyclic voltammogram in 14mol / L NaOH solution. The scanning speed adopted is 50mV / s, which is equivalent to the working mode of fast charging and discharging (the time to complete a charging and discharging cycle is 46 seconds. (Note: the scanning in the direction of potential increase is relative to charging, that is, ferrate is generated; the opposite Direction scanning relative to discharge, ferrate reduction). The Fe electrode is the counter electrode, and the reference electrode is the Hg / HgO electrode of the same solution. Under this working mode, the ferrate is almost regenerated under its thermodynamic equilibrium condition, that is, the charging process is very Rapid, suitable for the working mode of fast charging. Or it is considered that the disch...

Embodiment 2

[0028] The synthesis conditions of the above-mentioned coated anode material are slightly different from those in Example 1, and the synthesis conditions are Sn:Sb=56˜3:1 (mol ratio). Slow scanning is still carried out in the above-mentioned similar strong alkaline solution, which is equivalent to the working mode of slow charging and discharging. It takes 1.8 hours to complete a charge-discharge cycle. During the charge-discharge process, the electrochemical oxidation / reduction cycle of ferrate is highly reversible, with a difference of 110mV, which is favorable from the perspective of energy conversion.

Embodiment 3

[0030] Carry out 30 charge-discharge cycles (or redox cycles) with the coated anode materials used in the above two implementation examples in a similar strong alkaline solution, and then measure the oxidation current and reduction current to measure the coating anode material The results show that the material is very stable, that is, resistant to electrochemical corrosion and strong oxidant corrosion.

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Abstract

The present invention provides a preparation method of Sn-Sb oxide coated anode material, which is used in direct electrochemical synthesis of super ferrate. This anode material has very high over-voltage of oxygen evolution and excellent stability and therefore electrochemical oxidation reaction can happen to trivalent iron compound, forming super ferrate without oxygen evolution. Besides, electrochemical redox reaction between super ferrate and trivalent iron compound on this anode material has good reversibility. It is easy to realize mass production. The anode material is cheap and does not pollute environment, therefore, the method is suitable for the preparation of high specific energy second batteries. It also has application value and potential in the treatment of alkaline waste water.

Description

technical field [0001] The invention belongs to the field of novel green chemical power supply and the field of water pollution treatment. Background technique [0002] Green secondary chemical power sources have many advantages such as high specific energy, long cycle life and environmental friendliness, and have been widely valued in the past ten years. At present, there are many kinds of chemical power sources that can be called green secondary chemical power sources, such as nickel-metal hydride batteries and lithium-ion batteries. These chemical power sources are all single-electron processes in terms of charging / discharging principle, so there are some limitations inevitably. In recent years, emerging research on high-iron batteries and published patents (such as CN 1416190A) have shown that it is possible to make it a member of the family of green secondary chemical power sources. This chemical power source not only has the above advantages, but also has abundant raw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/00
Inventor 吴锋张存中刘震王芳苏岳峰单忠强
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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