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Cadmium Selenide Quantum Dots Sensitized Titanium Dioxide Nanorod Photoelectrode and Its Preparation and Application

A quantum dot sensitization, titanium dioxide technology, applied in electrodes, electrolytic components, energy input and other directions, can solve the problems of limited application and poor photostability, achieve large specific surface area, increase activity, and improve the effect of easy photocorrosion

Inactive Publication Date: 2019-01-25
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, cadmium selenide is a typical n-type narrow-band semiconductor photocatalyst material (Eg=1.7eV), which can effectively absorb and convert visible light, but its application is greatly limited due to its poor photostability.

Method used

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  • Cadmium Selenide Quantum Dots Sensitized Titanium Dioxide Nanorod Photoelectrode and Its Preparation and Application
  • Cadmium Selenide Quantum Dots Sensitized Titanium Dioxide Nanorod Photoelectrode and Its Preparation and Application

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Effect test

Embodiment 1

[0031] A preparation method of cadmium selenide quantum dot sensitized titanium dioxide nanorod photoelectrode, comprising the following steps:

[0032] (1) At room temperature, add 0.35mL tetrabutyl titanate (99%) dropwise to 15mL6mol / L HCl solution, and after stirring vigorously for 30min, transfer the above mixed solution to 25mL PTFE-lined stainless steel In the high-pressure reactor, the surface-cleaned FTO electrode was then placed in the mixed solution, and its conductive surface was placed downward; the reaction was continued at a constant temperature of 150 °C for 4 hours; when it was cooled to room temperature, the surface of the sample electrode was washed with twice distilled water to prepare TiO2 nanorod substrate electrodes were obtained.

[0033] (2) Place the titanium dioxide nanorod base electrode in step (1) in a newly prepared 8ml0.1mol / LNa 2 SeSO 3 and the same volume of 0.02mol / LCd(NO 3 ) 2 And 0.5mol / L sodium citrate mixed solution. Among them, Na 2 S...

Embodiment 2

[0035] At room temperature, the traditional three-electrode system was used to perform photoelectrochemical performance tests on a CHI660c electrochemical workstation. The cadmium selenide quantum dot-sensitized titanium dioxide nanorod photoelectrode prepared in Example 1 was used as the photoanode, and the platinum sheet was used as the cathode. A calomel electrode (SCE) was used as a reference electrode. In the 0.5mol / L KOH electrolyte solution containing 0.1mol / L glucose, the ampere i-t curve test was carried out on the cadmium selenide quantum dot-sensitized titanium dioxide nanorod photoelectrode. Compared to pure water oxidation (0.01mA / cm 2 ), the biomass derivative glucose is more likely to undergo oxidation reaction on the surface of the photoelectrode, thereby increasing the photocurrent density value of the sample electrode (0.07mA / cm 2 ).

Embodiment 3

[0037] In a sealed gas circulation system equipped with a self-made three-electrode reactor and a vacuum circuit, the cadmium selenide quantum dot-sensitized titanium dioxide nanorod photoelectrode prepared in Example 1 is used as the photoanode, the platinum sheet is used as the cathode and the saturated calomel electrode (SCE) As a reference electrode, the electrolyte solution is: 0.5mol / L KOH electrolyte solution containing 0.1mol / L glucose. A 300W short-arc Xe lamp was equipped with a visible light filter as a visible light source and a -0.3V (vs. SCE) bias was applied at the Pt cathode. Finally, the collected gas was qualitatively and quantitatively determined by on-line gas chromatography (GC) equipped with a thermal conductivity sensor (TCD). Such as figure 2 as shown ( figure 2 , the curves are 1h, 1.5h, 2h, 2.5h, 3h, 4h, 5h, 6h from bottom to top), and the hydrogen production at the Pt cathode shows a gradually increasing trend with the increase of reaction time. ...

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Abstract

The invention relates to a cadmium selenide quantum dot sensitized titanium dioxide nano-rod optical electrode, and preparation and application thereof, and belongs to the field of optical electrode materials. A cadmium selenide quantum dot sensitized titanium dioxide nano-rod hetero-structure optical electrode is prepared by uniformly depositing cadmium selenide quantum dots with the characteristics of visible light to coat the surface of a titanium dioxide nano-rod array substrate electrode. The cadmium selenide quantum dot sensitized titanium dioxide nano-rod optical electrode is used for photoelectrocatalytic oxidation of biomass derivatives to promote hydrogen production. Compared with the prior art, the cadmium selenide quantum dot sensitized titanium dioxide nano-rod hetero-structure optical electrode is constructed for the photoelectrocatalytic oxidation of biomass derivative glucose to promote the hydrogen production. The cadmium selenide quantum dot sensitized titanium dioxide nano-rod hetero-structure optical electrode has excellent photoelectrochemical properties and repeatability, and moreover, has super-high activity on photocatalytic oxidation of glucose for producing hydrogen.

Description

technical field [0001] The invention relates to a photoelectrode material, in particular to a cadmium selenide quantum dot sensitized titanium dioxide nanorod photoelectrode and its preparation and application. Background technique [0002] Since the 21st century, solar energy, as an inexhaustible energy source, has been vigorously developed and applied by scientific researchers, such as directly converting solar energy into electrical energy, or hydrogen energy. At present, it is the urgent desire of people all over the world to develop new energy sources with high efficiency and environmental protection, control pollution and reduce energy consumption, and realize sustainable development. Therefore, converting solar energy into hydrogen energy has become one of the research hotspots and priorities in the world today. At present, the use of solar energy to split water to produce hydrogen is mainly realized through the following three ways: (1) Photo-assisted complexation c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/06C25B1/02
CPCY02P20/133
Inventor 赵国华张亚军
Owner TONGJI UNIV
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