Preparation method and application of a heterojunction photoelectrode

A heterojunction and photoelectrode technology, applied in the direction of material electrochemical variables, can solve problems such as limiting photoelectric conversion efficiency, and achieve the effects of cheap and easy-to-obtain materials, good repeatability, and good chemical stability

Active Publication Date: 2017-11-17
HUAWEI TEHCHNOLOGIES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Titanium dioxide (TiO 2 ) is the earliest known semiconductor for solar hydrogen production, however, due to TiO 2 The wide band gap (about 3.2 eV) can only respond to ultraviolet light (about 5% of sunlight), which greatly limits the ability of TiO 2 The photoelectric conversion efficiency; graphene has the ability to promote the transfer of photogenerated charges between different semiconductors and enhance the performance of PEC water splitting. Graphene, as an excellent charge transport medium, has been applied to α-Fe 2 o 3 / BiV 1–x Mo x o 4 and Fe 3 o 4 Construction of / ZnO heterojunction photoelectrode

Method used

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  • Preparation method and application of a heterojunction photoelectrode
  • Preparation method and application of a heterojunction photoelectrode
  • Preparation method and application of a heterojunction photoelectrode

Examples

Experimental program
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Effect test

Embodiment 1

[0035] A. TiO was prepared on FTO substrate 2 nanorod array

[0036] The described preparation of TiO on the FTO substrate 2 The steps of nanorod array are:

[0037] (1) Dissolve 15 mL of hydrochloric acid solution in 15 mL of deionized water, then slowly add 0.35 mL of butyl titanate to the solution and stir until the solution becomes clear to obtain mixed solution A.

[0038] (2) Transfer the mixed solution A to a reaction kettle lined with tetrafluoroethylene, put the cleaned FTO substrate in it, with the conductive side facing down, raise the temperature to 180 °C for 6 h, and cool naturally to obtain the surface Deposited with monolayer TiO 2 FTO substrate of nanorod arrays.

[0039] (3) Add 2 mL of acetic acid to 100 mL of ethanol, and then add 1.5 mL of butyl titanate and stir to form a uniform mixed solution B.

[0040] (4) Take out the above-mentioned FTO substrate, wash it with deionized water, and then soak it in solution B for 1 h.

[0041] (5) Put the soaked...

Embodiment 2

[0047] A. TiO was prepared on FTO substrate 2 Nanorod Arrays:

[0048] The described preparation of TiO on the FTO substrate 2 The steps of nanorod array are:

[0049] (1) Dissolve 15 mL of hydrochloric acid solution in 15 mL of deionized water, then slowly add 0.35 mL of butyl titanate to the solution and stir until the solution becomes clear to obtain mixed solution A.

[0050] (2) Transfer the mixed solution A to a reaction kettle lined with tetrafluoroethylene, put the cleaned FTO substrate in it, with the conductive side facing down, raise the temperature to 180 °C for 6 h, and cool naturally to obtain the surface Deposited with monolayer TiO 2 FTO substrate of nanorod arrays.

[0051] (3) Add 2 mL of acetic acid to 100 mL of ethanol, and then add 1.5 mL of butyl titanate and stir to form a uniform mixed solution B.

[0052] (4) Take out the above-mentioned FTO substrate, wash it with deionized water, and then soak it in solution B for 1 h.

[0053] (5) Put the soak...

Embodiment 3

[0059] A. TiO was prepared on FTO substrate 2 nanorod arrays.

[0060] The described preparation of TiO on the FTO substrate 2 The steps of nanorod array are:

[0061] (1) Dissolve 15 mL of hydrochloric acid solution in 15 mL of deionized water, then slowly add 0.35 mL of butyl titanate to the solution and stir until the solution becomes clear to obtain mixed solution A.

[0062] (2) Transfer the mixed solution A to a reaction kettle lined with tetrafluoroethylene, put the cleaned FTO substrate in it, with the conductive side facing down, raise the temperature to 180 °C for 6 h, and cool naturally to obtain the surface Deposited with monolayer TiO 2 FTO substrate of nanorod arrays.

[0063] (3) Add 2 mL of acetic acid to 100 mL of ethanol, and then add 1.5 mL of butyl titanate and stir to form a uniform mixed solution B.

[0064] (4) Take out the above-mentioned FTO substrate, wash it with deionized water, and then soak it in solution B for 1 h.

[0065] (5) Put the soak...

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Abstract

The invention belongs to the field of photoelectrochemical technology, and specifically refers to a preparation method and application of a heterojunction photoelectrode. First, a double-layer TiO2 nanorod array is synthesized on an FTO substrate, and then a uniform spin-coating method is used to spin-coat it on the FTO substrate. Layer redox graphene, and finally use chemical deposition and photodeposition methods to load CdS@Au core-shell structure nanoparticles on the surface of redox graphite / TiO2. The Au@CdS / RGO / TiO2 heterojunction photoelectrode prepared by simple hydrothermal synthesis method, spin coating method, chemical deposition method and photodeposition method has good chemical stability and good photoelectrochemical performance. ; The process of the present invention is simple, the repeatability is good, and the materials used are cheap and easy to obtain, which meets the requirements of environmental friendliness.

Description

technical field [0001] The invention belongs to the field of photoelectrochemical technology, and particularly refers to a preparation method and application of a heterojunction photoelectrode. First, double-layer TiO is synthesized on an FTO substrate. 2 Nanorod arrays, and then uniformly spin-coat a layer of redox graphene on it by spin coating (, and finally use chemical deposition and photodeposition on redox graphite / TiO 2 Surface loaded CdS@Au core-shell nanoparticles. Background technique [0002] Since the 21st century, the excessive use of fossil energy has caused serious damage to the global environment, so the development and utilization of green energy has become one of the most important challenges facing mankind; photoelectrochemical (PEC) water splitting hydrogen production is a It is a promising technology, which can realize the conversion of solar energy to chemical energy, and the non-polluting combustion process makes hydrogen have incomparable advantages...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/30
Inventor 范伟强李春发陈超吴国玲陈继斌
Owner HUAWEI TEHCHNOLOGIES CO LTD
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