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Cu2O Quantum Dots Modified Titanium Dioxide Nanotube Photoelectrode and Its Preparation and Application

A technology of titanium dioxide and quantum dots, applied in the direction of electrodes, electrode shapes/types, electrolytic components, etc., can solve the problems of high recombination rate of photogenerated electrons and hole pairs, low photocatalytic activity, etc., to reduce energy consumption and increase stability Sexuality, increased absorption and transformation properties

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

However, TiO 2 It is a wide bandgap (3.2eV) semiconductor material that can only be excited by ultraviolet light with a wavelength 2 The high recombination rate of photogenerated electrons and hole pairs will lead to low photocatalytic activity.

Method used

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  • Cu2O Quantum Dots Modified Titanium Dioxide Nanotube Photoelectrode and Its Preparation and Application
  • Cu2O Quantum Dots Modified Titanium Dioxide Nanotube Photoelectrode and Its Preparation and Application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Cu 2 The preparation method of O quantum dot modified titanium dioxide nanotube photoelectrode comprises the following steps:

[0036] (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 for 10 min in double distilled water and ethanol solution, and then the surface was dried 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, the electrode spacing is 1cm, and the cell voltage is 60V for multi-step electrochemical anodization. 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 cleaned with double-distilled water for 1 min, and then the crystallized anodized product was calcined at 500 °C in an air atmosphere to prepare a periodic ...

Embodiment 2

[0039] Under room temperature conditions, the photoelectrochemical performance test was carried out on the CHI660c electrochemical workstation using the traditional three-electrode system, and the Cu prepared in Example 1 2 O quantum dots modified titanium dioxide nanotube photoelectrode was used as photoanode, saturated calomel electrode (SCE) and Pt sheet were used as reference electrode and counter electrode respectively, and 0.5mol / L KOH solution containing 0.1mol / L glucose was used as electrolyte. Ampere i-t curve test results show that Cu 2 O quantum dots modified titania nanotube heterostructure photoelectrode exhibited significantly increased photocurrent density value of 0.05mA / cm 2 . Compared with the oxidation photocurrent density value of pure water at its surface 0.02mA / cm 2 , the results further show that the biomass derivative glucose is more prone to oxidation reaction at the surface of the photoelectrode.

Embodiment 3

[0041] Equip self-made three-electrode reactor and vacuum air circuit in the sealed gas circulation system, with the Cu prepared in Example 1 2 The O quantum dot modified titanium dioxide nanotube photoelectrode was used as the photoanode, the platinum sheet was used as the cathode and the saturated calomel electrode (SCE) was used as the reference electrode. The electrolyte solution was: 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 to the Pt cathode. Finally, the collected gas was qualitatively and quantitatively determined by an online 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, and 6h from bottom to top), and the hydrogen production at the Pt cathode shows a gradually increasing trend with the increase of rea...

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Abstract

The invention relates to a Cu2O quantum dot-modified titanium dioxide nano-tube photoelectrode and a preparation and an application thereof, which belong to the field of a photoelectrode material. According to the invention, p-type semiconductor Cu2O quantum dots having visible luminous characteristic are uniformly modified on the surface of a n-1 periodic ordered titanium dioxide nano-tube array substrate electrode, and the Cu2O quantum dot-modified titanium dioxide nano-tube photoelectrode is prepared. The Cu2O quantum dot-modified titanium dioxide nano-tube photoelectrode is used for oxidation of a photoelectrocatalysis biomass derivative for promoting hydrogen production. Compared with the prior art, a high efficiency photoelectric catalytic oxidation technology and an electrocatalysis decomposition water hydrogen production technology are combined, the Cu2O quantum dot-modified titanium dioxide nano-tube photoelectrode is constructed in a reasonable mode and prepared for photoelectrocatalysis biomass derivative glucose oxidation for hydrogen production. The preparation method has the advantages of simple process and mild reaction condition. The hydrogen production amount through decomposition water by the Cu2O quantum dot-modified titanium dioxide nano-tube photoelectrode is 97.93 [mu]mol / cm<2>, and the photoelectrocatalysis stable performance is excellent.

Description

technical field [0001] The invention belongs to the field of photoelectrode materials, in particular to a Cu 2 O quantum dots modified titanium dioxide nanotube photoelectrode and its preparation and application. Background technique [0002] At present, the depletion of fossil energy and the environmental degradation caused by it has become an urgent problem to be solved in the development of human society, and the development of green, high-energy and new sustainable energy is imminent. Compared with traditional fossil energy, hydrogen energy is an ideal renewable energy type in today's human society, due to its relatively high energy reserve value. The highest and the final product of combustion is only water, and there is no harm to the surrounding environment. Since the 1970s, Honda and Fujishima first reported the TiO 2 The photoelectric catalytic water splitting hydrogen production marks that the water splitting hydrogen production has entered a new era. Directly ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/02C25B11/16C25B1/02
CPCC25B1/02C25B11/02C25B1/55C25B11/051C25B11/057C25B11/077Y02E60/36
Inventor 赵国华张亚军
Owner TONGJI UNIV
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