Method for enhancing electrochemical performance of TiO2 electrode

An electrochemical and anodic oxidation technology, applied in the field of electrochemistry, can solve the problems of carrier recombination heat and electrochemical instability, achieve electrochemical performance, photoelectric catalytic performance and conductivity, and the processing method is simple and easy , the effect of solving energy problems and environmental pollution problems

Inactive Publication Date: 2013-06-19
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, issues such as carrier recombination and thermal and electrochemical instability due to the introduction of dopants remain elusive (R Asahi, et al. Science 293 (2001) 269)

Method used

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  • Method for enhancing electrochemical performance of TiO2 electrode
  • Method for enhancing electrochemical performance of TiO2 electrode
  • Method for enhancing electrochemical performance of TiO2 electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Preparation of TiO by Constant Pressure Oxidation 2 Electrode: Anodic oxidation is carried out in a two-electrode system with titanium foil as the working electrode and carbon rod as the counter electrode. The electrolyte is 0.5 wt % NH 4 F and 2 vol % H 2 O solution in ethylene glycol. First, put the titanium foil in the air at 450 ° C annealed for 20 min to eliminate structural stress, and then ultrasonically cleaned the titanium foil with acetone, ethanol, and water for 10 min. An anodic oxidation was carried out at a constant voltage of 60 V for 2 h, then the oxide film was removed by ultrasonication for 30 min, and the pitted titanium foil was cleaned with acetone, ethanol and water in sequence. Then carry out the second anodic oxidation, the oxidation conditions are the same as the first oxidation, and take out the TiO after the oxidation is completed. 2 The electrodes were rinsed with deionized water and dried. The prepared amorphous TiO 2 The electrode is ...

Embodiment 2

[0021] Preparation of TiO by Hydrothermal Method 2 Electrode: Add isopropyl titanate and isopropanol to acetic acid with pH=2 according to the volume ratio of 1:1 at room temperature, mix and stir, and then ° Heating in a C oil bath for about 1 h and stirring vigorously, then the solution was transferred to an autoclave, sealed at 250 ° Place under C for 12h. Finally, ultrasonically disperse the colloidal solution at 120 ° C Heated for a certain period of time to obtain a milky white colloid, which was applied to the cleaned conductive glass with a coating area of ​​1.2 cm 2 ,drying. The reverse voltage application process is the same as that in Embodiment 1. The test results show that the hydrothermal method to prepare TiO 2 The specific capacitance of the electrode is 63μF / cm 2 ; Treated TiO 2 Electrode specific capacitance reaches 1.06 mF / cm 2 . Hydrothermal preparation of TiO under UV at a wavelength of 365 nm and sunlight with an AM of 1.5 G 2 The photocurrents ...

Embodiment 3

[0023] Preparation of TiO by template method 2 Electrode: The template is porous alumina with an aluminum substrate (remove the barrier layer, the pore size is 60 nm, the thickness is 20 microns, and the area is 1.2 cm 2 ), using 0.1 M (NH 4 ) 2 TiF 6 for the precursor. Immerse the porous alumina with aluminum substrate in the precursor solution, take it out after reacting for 1 h, rinse it with deionized water, and dry it. The reverse voltage application process is the same as that in Embodiment 1. The test results showed that the treated TiO 2 Electrode specific capacitance is 5.89 mF / cm 2 ; Under UV with a wavelength of 365 nm and sunlight with an AM of 1.5 G, the photocurrents can reach about 136 μA and 163 μA, respectively.

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Abstract

The invention discloses a simple, convenient, low-cost and high-efficiency method for enhancing the electrochemical performance of a TiO2 electrode. The method is used for reversely applying voltage to the TiO2 electrode, electrochemical reaction treatment is preformed in a two-electrode system by taking neutral, acidic or alkaline solution as electrolyte, a negative electrode of the two-electrode system is the annealed TiO2 electrode, and a positive electrode of the two-electrode system is a carbon rod. In the method, special equipment is omitted, H+ ions in the solution are driven by an electric field, doping and defects are directly led into the TiO2 electrode, the electrochemical performance of the TiO2 electrode is enhanced, TiO2 energy gaps are reduced, the light absorption rate is increased, and electrical conductivity of the electrode is improved. The original TiO2 structure (such as a TiO2 nanotube and a nanowire array) cannot be damaged, so that the TiO2 electrode can be more effectively applied to the field of energy storage, photocatalysis, solar cells, photochromatism and the like.

Description

technical field [0001] The invention belongs to the field of electrochemical technology, and relates to a simple, cheap and efficient enhanced TiO 2 Methods for electrochemical performance of electrodes. This method can enhance the TiO 2 As an energy storage device electrode, a solar cell electrode and a photoelectric catalytic material, it can also be used as a good conductive material in other fields. Background technique [0002] With the rapid development of global informatization and industrialization, various computers, microelectronic devices and mobile communication devices are becoming more and more popular, and there is an urgent need for high-performance memory backup power. On the other hand, the consumption of fuel vehicles has caused energy shortage and serious environmental pollution, which has prompted people to design and produce low-energy and low-emission electric vehicles or hybrid electric vehicles. However, due to insufficient power density, the curr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G4/008C25D11/26
Inventor 朱绪飞吴慧杨斌宋晔
Owner NANJING UNIV OF SCI & TECH
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