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Preparation method and application of double-layer electrode

A double-layer electrode, photocatalytic technology, applied in the field of environmental pollution treatment technology and material chemistry, to achieve the effect of improving electron transfer efficiency, photocatalytic activity and effect

Active Publication Date: 2017-09-19
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since {001}TiO 2 There will be a gap between the nanosheets and the substrate electrode during the stacking process

Method used

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  • Preparation method and application of double-layer electrode
  • Preparation method and application of double-layer electrode
  • Preparation method and application of double-layer electrode

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A double-layer D-{001}TiO 2 The preparation method of / Ti electrode specifically comprises the following steps:

[0027] (1) Under magnetic stirring, hydrofluoric acid (HF) was added dropwise to isopropyl titanate, and anatase {001}TiO was obtained by hydrothermal method 2 nanoparticles.

[0028] (2) At room temperature, mix absolute ethanol, tetrabutyl titanate, and concentrated nitric acid, stir vigorously, and let stand to form light yellow transparent TiO 2 Sol. The surface of the pure metal titanium sheet is polished, polished, cleaned and etched with metallographic sandpaper, fixed vertically on the pulling dipping machine, and the Ti base electrode is immersed in the TiO 2In the sol, pull and dip for 1 to 3 times at a speed of 1-2mm / min, and after natural drying, place it in a tube furnace for heat treatment with a temperature increase of 0.7°C / min-2°C / min Raise the temperature to 450°C-550°C for 30-60 minutes to obtain dense TiO 2 Oxide film conductive layer...

Embodiment 2

[0031] Comparative electrode S-{001}TiO 2 / Ti was prepared according to the method of Example 1. After the Ti plate was etched, the prepared {001}TiO 2 nanoparticles.

[0032] The prepared D-{001}TiO 2 / Ti electrode and S-{001}TiO 2 / Ti electrodes were characterized by field emission scanning electron microscopy, by figure 1 It can be observed that for D-{001}TiO 2 The TiO present between the / Ti electrode and the substrate electrode 2 The conductive layer of the oxide film is closely combined with the substrate, but for S-{001}TiO 2 / Ti electrode and its deposited {001}TiO 2 layer due to {001}TiO 2 There are gaps between the stacks of nanoparticles and a certain gap between them and the substrate electrode, which hinders the transport of electrons on the electrodes.

Embodiment 3

[0034] D-{001}TiO 2 / Ti electrode and contrast electrode photoelectrochemical measurement, concrete steps comprise as follows:

[0035] D-{001}TiO on CHI660c electrochemical workstation 2 / Ti and S-{001}TiO 2 / Ti electrode for photoelectrochemical performance test, the control electrode area is 0.5cm 2 , the device used is a three-electrode system electrochemical reaction cell with a quartz window, with a saturated calomel electrode (SCE) as the reference electrode, a Pt wire electrode as the counter electrode, and a 0.1mol L -1 Na 2 SO 4 The solution is an electrolyte. With 300W LA-410UV as the light source, apply a bias voltage of 0.4V, and measure its i-t curve. At the same time, at the open circuit potential, D-{001}TiO 2 / Ti and S-{001}TiO 2 AC impedance plots of the / Ti electrode under non-illuminated and illuminated conditions. Such as figure 2 As shown, D-{001}TiO 2 / Ti photocurrent is S-{001}TiO 2 / Ti photocurrent response value 8 times. Such as image ...

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Abstract

The invention relates to a preparation method and application of a double-layer electrode. The preparation method comprises the steps that a layer of TiO2 sol-gel is adhered to a substrate of a Ti plate through a lifting and steeping method, a compact TiO2 oxidation film is formed after calcination, then anatase {001}TiO2 nanosheets prepared through a hydrothermal method are deposited on the prepared electrode through an electrophoretic deposition technology, and a double-layer D-{001}TiO2 / Ti electrode is constructed. Compared with the prior art, a layer of the compact TiO2 oxidation film is adhered to the substrate electrode first to serve as a conducting layer, then a layer of anatase {001}TiO2 nanoparticles are deposited through the electrolytic deposition method, the double-layer D-{001}TiO2 / Ti electrode is prepared, and transmission of photo-induced electrons to the substrate electrode to an external circuit is enhanced; compared with a single-layer S-{001}TiO2 / Ti electrode, the D-{001}TiO2 / Ti electrode has the better photoelectrochemical properties, and meanwhile the efficiency of degrading dimethyl phthalate through photoelectrocatalytic oxidation of the D-{001}TiO2 / Ti electrode is improved by about 12%.

Description

technical field [0001] The invention belongs to the field of environmental pollution treatment technology and material chemistry, in particular to a double layer {001}TiO 2 / Ti plate electrode (D-{001}TiO 2 / Ti) and its application in efficient photocatalytic removal of dimethyl phthalate. Background technique [0002] Phthalates, commonly known as plasticizers, are widely used in the plastics industry because they can increase the plasticity and flexibility of plastics. Because it is connected with plastic molecules by weak hydrogen bonds or van der Waals forces, its binding force is weak and it is easy to diffuse from plastics to the external environment, thus becoming one of the widespread pollutants in the atmosphere, The presence of such pollutants can be detected in environmental media such as water bodies and soils. This kind of substance has the effect similar to biological hormones, can affect the endocrine system of organisms, and can cause harms such as decreas...

Claims

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Application Information

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IPC IPC(8): C23C28/04C23C18/12C25D13/02C02F1/461C02F1/72C02F101/34
CPCC02F1/4672C02F2001/46142C02F2101/34C23C18/1216C23C18/1254C23C28/042C25D13/02
Inventor 曹同成宋丹赵国华
Owner TONGJI UNIV
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