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Gold nanoparticle-modified dendritic titanium dioxide nanorod array electrode, as well as preparation method and application of hydrogen production by photocatalytic water splitting

A nanorod array and gold nanoparticle technology, applied in the field of photoelectrochemistry, can solve the problems of not being able to use visible light, low photocatalytic activity, and small contact area, and achieve the effect of alleviating the shortage of fossil fuels, efficient and clean energy, and good repeatability

Inactive Publication Date: 2013-10-16
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] What the present invention will solve is traditional TiO 2 Nanorod array material with small contact area and dendritic TiO 2 Nanorod array materials cannot utilize visible light and have low photocatalytic activity, which limits the use of TiO 2 Technical problems in the application of nanorods in the field of photoelectric catalysis, providing a dendritic titania nanorod array electrode modified by gold nanoparticles and its preparation method and photoelectric water splitting application

Method used

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  • Gold nanoparticle-modified dendritic titanium dioxide nanorod array electrode, as well as preparation method and application of hydrogen production by photocatalytic water splitting
  • Gold nanoparticle-modified dendritic titanium dioxide nanorod array electrode, as well as preparation method and application of hydrogen production by photocatalytic water splitting
  • Gold nanoparticle-modified dendritic titanium dioxide nanorod array electrode, as well as preparation method and application of hydrogen production by photocatalytic water splitting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] (1) TiO 2 Fabrication of Nanorod Arrays

[0051] ① Sonicate the FTO conductive glass in deionized water, acetone and ethanol solution for 10 minutes successively, wash it with deionized water, and dry it for later use;

[0052] ② Prepare the precursor solution of titanium source: first mix 30ml of concentrated hydrochloric acid (37.5% mass concentration) with 30ml of deionized water, stir for 5 minutes, add 1ml of butyl titanate and continue stirring for 5 minutes to obtain the titanium source precursor solution ;

[0053] ③ Place the conductive surface of the FTO conductive glass obliquely downward in the crystallization kettle, add the titanium source precursor solution, and hydrothermally synthesize it at 150°C for 14 hours to prepare TiO 2 Nanorod arrays were washed with deionized water and dried at 80°C.

[0054] (2) Dendritic TiO 2 Fabrication of Nanorod Arrays

[0055] ① Prepare 0.2M TiCl 4 Aqueous solution: the preparation process is to take a certain amou...

Embodiment 2

[0073] (1) TiO 2 The preparation of the nanorod array is the same as in Example 1.

[0074] (2) Dendritic TiO 2 The preparation of the nanorod array is the same as in Example 1.

[0075] (3) Dendritic TiO modified with Au nanoparticles 2 Fabrication of Nanorod Arrays

[0076] ① Prepare 0.9mM HAuCl 4 aqueous solution.

[0077] ② Dendritic TiO 2 The nanorod array is used as the substrate, and the method of ultraviolet light reduction (ultraviolet light intensity is 80mW / cm 2 ) to prepare Au nanoparticles modified dendritic TiO 2 Nanorod arrays with a reduction time of 9 hours.

[0078] Experimental results show that the diameter of the backbone nanorods is 150-200nm and the length is 2.4μm, the diameter of the dendritic structure is 10-20nm and the length is 50-100nm, and the diameter of the Au nanoparticles is 10-20nm.

[0079] Photoelectrochemical performance tests showed that Au nanoparticles modified dendritic TiO 2 The photocurrent density of nanorod array is 2.0m...

Embodiment 3

[0081] (1) TiO 2 The preparation of the nanorod array is the same as in Example 1.

[0082] (2) Dendritic TiO 2 Fabrication of Nanorod Arrays

[0083] ① Prepare 0.1M TiCl 4 Aqueous solution: the preparation process is to take a certain amount of TiCl under stirring conditions 4 soluble in ice water;

[0084] ②The prepared TiO 2 Nanorod arrays placed in 0.2M TiCl 4 Amorphous dendritic TiO was prepared by chemical water bath deposition under sealed conditions in aqueous solution for 24 hours 2 nanorod arrays;

[0085] ③ The above-prepared amorphous dendritic TiO 2 Nanorod arrays were fired under air atmosphere for 30 min to form dendritic TiO 2 nanorod arrays.

[0086] (3) Dendritic TiO modified with Au nanoparticles 2 Fabrication of Nanorod Arrays

[0087] ① Prepare 1.5mM HAuCl 4 aqueous solution.

[0088] ② Dendritic TiO 2 The nanorod array is used as the substrate, and the method of ultraviolet light reduction (ultraviolet light intensity is 120mW / cm 2 ) to pr...

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Abstract

The invention discloses a gold nanoparticle-modified dendritic titanium dioxide nanorod array electrode, as well as a preparation method and an application of hydrogen production by photocatalytic water splitting. The gold nanoparticle-modified dendritic titanium dioxide nanorod array electrode comprises a trunk nanorod densely distributed with dendritic structures on the surface, wherein gold nanoparticles are uniformly loaded on the surfaces of the dendritic structures. The preparation method is composed of three steps, namely, preparation for a TiO2 nanorod array, preparation for a dendritic TiO2 nanorod array, and preparation for gold nanoparticle-sensitized dendritic TiO2 nanorod array. According to the nanorod array electrode, the preparation method, and the application, the compounding of electron-hole pairs is effectively suppressed; the photocatalytic water splitting efficiency of the material is increased; the light absorption range of the material is expanded to a visible region via the surface plasma resonance (SPR) effect of gold nanocrystalline, thus improving the activity of the photocatalytic water splitting of a photoelectrochemical cell, and the material is great in stability simultaneously. The preparation method disclosed by the invention is simple, excellent in the performance of hydrogen production by photocatalytic water splitting, good in chemical stability, and capable of realizing low-cost and large-scale application.

Description

technical field [0001] The invention relates to the field of photoelectrochemical technology, in particular to a nanorod array electrode and a preparation method thereof. Background technique [0002] The conversion of solar energy into hydrogen energy has attracted much attention in today's society where fossil fuels are increasingly depleted and environmental pollution is serious 1 . Titanium dioxide (TiO 2 ) has a large reserve in nature, good corrosion resistance, cheap and non-toxic, has superior photocatalytic and photocatalytic properties, and is widely used in the fields of photocatalysis and photoelectrolysis of water to produce hydrogen 2 . However, TiO 2 Under light conditions, the photogenerated electron-hole recombination is extremely fast, and the photocatalytic activity is low; at the same time, TiO 2 The forbidden band width is 3.2ev, the band gap is wide, and its light absorption range is limited to the ultraviolet region (accounting for only 5% of the ...

Claims

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Application Information

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IPC IPC(8): H01M4/04B82B3/00H01G9/04H01G9/20H01G9/042
CPCY02E60/12Y02E60/10
Inventor 巩金龙苏凤莉王拓吕睿张鹏卢健伟马新宾
Owner TIANJIN UNIV
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