Carbon layer-coated chromium-doped strontium titanate/titanium dioxide nanotube photoelectrode and its preparation and application

A titanium dioxide and chromium doping technology, applied in the direction of electrodes, electrolytic components, electrolytic process, etc., can solve the problems of low solar energy utilization and conversion rate, reduced photoelectric catalytic activity, poor stability, etc., and achieve excellent visible light absorption characteristics, increase The effect of large absorption and conversion efficiency and large specific surface area

Inactive Publication Date: 2018-12-18
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, many semiconductor photocatalyst materials have been widely used in photocatalytic hydrogen production, but the defects of semiconductors limit their practical applications, such as wide bandgap semiconductors (such as TiO 2 ) The catalyst can only strongly absorb ultraviolet light, but the ultraviolet spectrum only accounts for about 5% of the total energy of the solar spectrum, resulting in a low utilization and conversion rate of solar light energy by wide bandgap semiconductors
Although narrow-bandgap semiconductor catalysts can effectively absorb visible light energy, such semiconductors such as CdS have strong photocorrosion problems and poor stability, which significantly reduces their photoelectrocatalytic activity.

Method used

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  • Carbon layer-coated chromium-doped strontium titanate/titanium dioxide nanotube photoelectrode and its preparation and application
  • Carbon layer-coated chromium-doped strontium titanate/titanium dioxide nanotube photoelectrode and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A method for preparing a carbon layer-coated chromium-doped strontium titanate / titanium dioxide nanotube heterostructure photoelectrode, comprising the following steps:

[0041] (1) The titanium plate was polished with 100#, 300# and 800# sandpaper in turn until its surface was smooth and flat; then it was ultrasonically cleaned with double distilled water and ethanol solution for 10 min, and then its surface was blown dry with nitrogen. At room temperature, in the traditional two-electrode system, the platinum sheet and the titanium sheet are used as the cathode and the anode respectively, and the electrode spacing is 1 cm; multi-step electrochemical anodization is performed when the applied cell voltage is 60V. The electrochemical anodizing electrolyte solution is: 0.3wt% NH 4 F and 2.0vol%H 2 O solution in ethylene glycol. After anodization, the anodized product was ultrasonically treated with twice distilled water for 1 min, and then the crystallized anodized prod...

Embodiment 2

[0045] At room temperature, the traditional three-electrode system was used to perform photoelectrochemical performance tests on a CHI660c electrochemical workstation, and the carbon layer-coated chromium-doped strontium titanate / titanium dioxide nanotube heterostructure photoelectrode prepared in Example 1 was used as the photoanode , a saturated calomel electrode (SCE) and a Pt sheet were used as reference and counter electrodes, respectively. A 0.5mol / L KOH solution of 0.1mol / L glucose is used as the electrolyte. The test results of the ampere i-t curve show that the photocurrent density of the carbon-coated chromium-doped strontium titanate / titanium dioxide nanotube heterostructure photoelectrode is as high as 0.44mA / cm 2 . Compared with the oxidation photocurrent density value of pure water oxidation at its surface of 0.28mA / cm 2 , the results further show that the biomass derivative glucose is more likely to undergo oxidation reaction on the surface of the photoelectro...

Embodiment 3

[0047] In a sealed gas circulation system equipped with a self-made three-electrode reactor and a vacuum circuit, the carbon layer-coated chromium-doped strontium titanate / titanium dioxide nanotube heterostructure photoelectrode prepared in Example 1 was used as the photoanode, and the platinum sheet was used as the photoanode. The cathode and saturated calomel electrode (SCE) are used as reference electrodes, and 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, 2h, 3h, 4h, 5h, 6h from bottom to top), and the hydrogen production at the Pt cathode shows a gradual increa...

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Abstract

The invention relates to a chromium doped strontium titanate / titanium dioxide nanotube photoelectrode coated with a carbon layer, preparation and application and belongs to the field of photoelectrode materials. A chromium doped strontium titanate / titanium dioxide nanotube combination electrode is obtained by uniformly modifying the surface of a periodic ordered titanium dioxide nanotube array substrate electrode with a chromium doped strontium titanate nano-cube with visible light feature, and then the chromium doped strontium titanate / titanium dioxide nanotube photoelectrode coated with the carbon layer is prepared with a carbon source coating method through inert gas calcination treatment. The photoelectrode with a heterostructure is taken as a photo-anode material for a photo-electrocatalytic process and used for hydrogen production through efficient photo-electrocatalytic glucose oxidation. Compared with the prior art, a photo-electrocatalytic hydrogen production method is simple and feasible, the operation is simple, and application conditions are mild. Besides, the hydrogen production amount promoted by glucose oxidation by aid of the chromium doped strontium titanate / titanium dioxide nanotube photoelectrode coated with the carbon layer is 23.97 times that through water splitting, and excellent photo-electrocatalytic stability is realized.

Description

technical field [0001] The invention relates to a photoelectrode material, in particular to a carbon layer-coated chromium-doped strontium titanate / titanium dioxide nanotube photoelectrode and its preparation and application. Background technique [0002] As the most ideal pollution-free green high-energy new energy, hydrogen energy is widely distributed in nature mainly in the form of molecular water. According to statistics, hydrogen accounts for more than 75% of the earth's components. As an energy source, it has the following characteristics: (1) high energy, which is three times higher than gasoline; (2) easy to store and transport; (3) non-toxic and only water is generated during combustion, and will not pollute the surrounding environment . So far, the main methods of industrial hydrogen production are: hydrogen production from fossil energy, hydrogen production by electrolysis of water, hydrogen production by biology, and hydrogen production by photocatalytic water ...

Claims

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Application Information

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