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TiO2/BiVO4 photo-anode material and preparation method thereof

A photoanode, nanoparticle technology, applied in electrodes, electrolysis process, electrolysis components, etc., can solve the problem of less research, and achieve the effect of increasing specific surface area, improving the performance of photo-electrolyzed water, and reducing the probability of recombination

Inactive Publication Date: 2015-10-21
HUBEI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above studies have shown that TiO 2 -BiVO 4 The recombination of TiO can effectively improve the charge separation, however, the current research is limited to the recombination of nanoparticles, and the TiO 2 / BiVO 4 Composite methods have been less studied in one-dimensional nanorod arrays

Method used

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  • TiO2/BiVO4 photo-anode material and preparation method thereof
  • TiO2/BiVO4 photo-anode material and preparation method thereof
  • TiO2/BiVO4 photo-anode material and preparation method thereof

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preparation example Construction

[0020] On the other hand, the present invention provides the TiO 2 / BiVO 4 The preparation method of photoanode material, it comprises the following steps:

[0021] (1) Prepare 6ml-10ml of deionized water, 6ml-10ml of 36.5-38wt% concentrated hydrochloric acid and 0.18ml-0.23ml of 98wt% tetra-normal titanate solution, and immerse the substrate 1 in the mixed solution at 150°C-180°C Reaction for 4h-10h, and finally annealing in air at 450-550°C for 1h-2h to obtain TiO 2 nanorod arrays;

[0022] (2) Configure soluble Bi salt and soluble V 4+ The mixed solution of salt, adjust mixed solution pH to 4.7, with the TiO that step (1) obtains 2 The nanorod array is the working electrode, set the reference electrode and the counter electrode, and deposit BiVO under the condition of 2.1V-2.3V voltage and 1.5C-4C power condition 4 The nanoparticle layer is annealed at 450°C-550°C after deposition to obtain the TiO 2 / BiVO 4 Photoanode material.

[0023] Specifically, the substrate ...

Embodiment 1

[0035] Clean the surface of the FTO conductive glass first, then ultrasonically in deionized water, acetone, alcohol, and deionized water for 20 minutes, then dry it with a hair dryer, and soak it in alcohol for sealed storage. Carry out XRD analysis to FTO conductive glass, obtain as follows figure 2 (a) The curve shown.

[0036] (1) Prepare 8ml of deionized water, 8ml of 36.5-38wt% concentrated hydrochloric acid and 0.2ml of 98wt% tetra-n-decyl titanate solution, lean the FTO conductive glass at an angle of 45° and immerse it in the mixed solution. The reaction volume is 25ml polytetrafluoroethylene jar, then placed in an oven at 150°C for 10h, and finally annealed in air at 500°C for 2h to obtain TiO 2 nanorod arrays. To get TiO 2 Nanorod arrays were analyzed by XRD, as shown in figure 2 (b) The curve shown.

[0037] (2) Prepare 35mmol / l VOSO with pH4 solution, followed by 10mmol / l Bi(NO 3 ) 3 solution dissolved in VOSO 4 solution, and then use concentrated nitric...

Embodiment 2

[0040] Clean the surface of the FTO conductive glass first, then ultrasonically in deionized water, acetone, alcohol, and deionized water for 20 minutes, then dry it with a hair dryer, and soak it in alcohol for sealed storage.

[0041] (1) Prepare 8ml of deionized water, 8ml of 36.5-38wt% concentrated hydrochloric acid and 0.2ml of 98wt% tetra-n-decyl titanate solution, lean the FTO conductive glass at an angle of 45° and immerse it in the mixed solution. The reaction volume is 25ml polytetrafluoroethylene jar, then placed in an oven at 150°C for 10h, and finally annealed in air at 500°C for 2h to obtain TiO 2 nanorod arrays.

[0042] (2) Prepare 35mmol / l VOSO with pH4 solution, followed by 10mmol / l Bi(NO 3 ) 3 solution dissolved in VOSO 4 solution, and then use concentrated nitric acid to adjust the pH of the above mixed solution to below 0.5, and then use 2mol / l CH 3 The pH of the solution was adjusted to 5.1 with COONa solution, and finally the pH of the mixed solution...

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Abstract

The invention discloses a TiO2 / BiVO4 photo-anode material which comprises a substrate, a TiO2 nano-rod array perpendicularly grown on the surface of the substrate, and a BiVO4 nano-particle layer deposited on the surface of the TiO2 nano-rod array. Through adoption of the TiO2 / BiVO4 photo-anode material, the water photoelectrolysis property is improved; compared with other water photoelectrolysis materials, the TiO2 / BiVO4 photo-anode material effectively overcomes the lattice defect of an interface layer, reduces the composition of photo-generated electrons and hole pairs, improves the own stability, expands the absorption spectrum range of visible light, promotes the effective separation of the photo-generated electrons and the hole pairs, realizes the synchronous reaction of hydrogen production and oxygen production, ensures that the ratio of the hydrogen yield to the oxygen yield is close to 2: 1, and is a relatively ideal water photoelectrolysis material. Moreover, the invention further discloses a preparation method of the TiO2 / BiVO4 photo-anode material. The preparation method has the characteristics that the nano-structure control is easy to realize technically, the prepared binary nano-rod array is excellent in crystallization property, and the interface quality is relatively high.

Description

technical field [0001] The invention belongs to the field of solar electrolysis water, in particular to a TiO 2 / BiVO 4 Photoanode materials and methods for their preparation. Background technique [0002] Solar energy is a new type of green energy. Using sunlight to decompose water to produce hydrogen, the development of "solar fuel" can overcome the characteristics of low density, high dispersion, instability, and discontinuity of solar energy. In today's increasingly depleted fossil fuels and serious environmental pollution The society has attracted much attention [[1] Guo Liejin, Liu Tao, Ji Jun, et al. Science & Technology Review, 2005, 23 (2): 29-33]. In recent years, well-oriented 1D single-crystal wide-gap semiconductor nanorod arrays have received increasing attention. This structure can provide a direct path for photogenerated electron transport and increase the electron transport rate. Single crystal TiO 2 Nanorods (TiO 2 NRs) have high transmittance to visi...

Claims

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Application Information

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IPC IPC(8): C25B11/04C25B1/04
CPCY02E60/36
Inventor 童锐王喜娜周小龙王浩
Owner HUBEI UNIV
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