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Nano Si/TiO2 ordered array compound photocatalytic water splitting hydrogen preparing cathode material and preparation method thereof

A technology of photo-splitting water to produce hydrogen and ordered arrays, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems that hinder the application of crystalline silicon, Si electrodes are easily corroded, and have poor stability and other issues to achieve the effect of improving photocurrent density and chemical stability and improving light absorption performance

Inactive Publication Date: 2014-07-09
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some problems hindering the application of crystalline silicon in the photolysis of water to produce hydrogen. One is that the light absorption ability of planar Si is very weak, and the other is that the Si electrode is easily corroded in the electrolyte and has poor stability.
In order to improve the light absorption of Si, the current common practice is to chemically etch one-dimensional Si nanowire arrays, but these nanowire arrays are disordered and dense, resulting in reduced light absorption and high carrier recombination probability.

Method used

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  • Nano Si/TiO2 ordered array compound photocatalytic water splitting hydrogen preparing cathode material and preparation method thereof
  • Nano Si/TiO2 ordered array compound photocatalytic water splitting hydrogen preparing cathode material and preparation method thereof
  • Nano Si/TiO2 ordered array compound photocatalytic water splitting hydrogen preparing cathode material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1 A kind of nano-Si / TiO 2 Ordered array composite photo-splitting water hydrogen production cathode material and its preparation method.

[0017] 1. First choose a piece of 2* 2 cm 2 Large and small P-type medium-resistance Si materials are used as the substrate, and the resistivity is 1-10Ω*cm.

[0018] 2. A two-dimensional hexagonal close-packed structure is formed on the Si substrate by self-assembly of polystyrene spheres with a size of 500 nm on the entire Si substrate. Then reactive ion beam etching was used to etch the polystyrene beads to 280nm-300nm, the etching parameters were flow rate 30Sccm, power 30W, air pressure 74mTorr, and etching time was 280s.

[0019] 3. Deposit 20nm Au as a catalyst on the Si substrate by ion sputtering method, and the deposition current is 10mA.

[0020] 3. Etching the ordered Si nanowire array, the specific process: first mix the HF and H2O2 solutions with a volume ratio of 4:1 evenly, and then put the Si substrate ...

Embodiment 2

[0022] Embodiment 2 A kind of nano-Si / TiO 2 Ordered array composite photo-splitting water hydrogen production cathode material and its preparation method.

[0023] 1. First choose a piece of 2* 2 cm 2 Large and small P-type medium-resistance Si materials are used as the substrate, and the resistivity is 1-10Ω*cm.

[0024] 2. A two-dimensional hexagonal close-packed structure is formed on the Si substrate by self-assembly of polystyrene spheres with a size of 500 nm on the entire Si substrate. Then reactive ion beam etching was used to etch the polystyrene beads to 280nm-300nm, the etching parameters were flow rate 30Sccm, power 30W, air pressure 74mTorr, and etching time was 280s.

[0025] 3. Deposit 20nm Au as a catalyst on the Si substrate by ion sputtering method, and the deposition current is 10mA.

[0026] 3. Etching the ordered Si nanowire array, the specific process: first, HF and H with a volume ratio of 4:1 2 o 2 The solution is mixed evenly, and then the Si subs...

Embodiment 3

[0028] Example 3 A nano-Si / TiO 2 Ordered array composite photo-splitting water hydrogen production cathode material and its preparation method.

[0029] 1. First choose a piece of 2* 2 cm 2 Large and small P-type medium-resistance Si materials are used as the substrate, and the resistivity is 1-10Ω*cm.

[0030] 2. A two-dimensional hexagonal close-packed structure is formed on the Si substrate by self-assembly of polystyrene spheres with a size of 500 nm on the entire Si substrate. Then reactive ion beam etching was used to etch the polystyrene beads to 280nm-300nm, the etching parameters were flow rate 30Sccm, power 30W, air pressure 74mTorr, and etching time was 280s.

[0031] 3. Deposit 20nm Au as a catalyst on the Si substrate by ion sputtering method, and the deposition current is 10mA.

[0032] 3. Etching the ordered Si nanowire array, the specific process: first, HF and H with a volume ratio of 4:1 2 o 2 The solution is mixed evenly, and then the Si substrate is pu...

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Abstract

The invention belongs to the technical field of preparation of electrochemical electrode materials and particularly relates to a nano Si / TiO2 ordered array compound photocatalytic water splitting hydrogen preparing cathode material and a preparation method thereof. According to the invention, nanospheres are photoetched on a P type Si substrate to prepare an ordered Si nanowire array which is coated by TiO2 to greatly improve the optical absorption property of the material, so that the photocurrent density and the chemical stability are improved, and the substrate can be used as a good photocatalytic water splitting hydrogen preparing cathode material. Experiments show that according to the material prepared by the method provided by the invention, when the Si nanowire array is 0.6-1.4 mu m long, the photocurrent density is great while when the Si nanowire array is 1.1 mu m long, the photocurrent density is maximum.

Description

technical field [0001] The invention belongs to the technical field of preparation of electrochemical electrode materials, in particular to nano-Si / TiO 2 Ordered array composite photo-splitting water hydrogen production cathode material and its preparation method. Background technique [0002] The continuous energy crisis and the sustainable development of the environment have caused people to attach great importance to the development of clean energy. Photolysis of water to produce hydrogen is a good way to convert solar energy into hydrogen energy. However, so far, the preparation of cathode materials for photolysis of water to produce hydrogen has encountered great problems. Generally speaking, an ideal cathode material for hydrogen production by photolysis usually has the following characteristics: (1) high light absorption rate and low carrier recombination rate, (2) high turn-on voltage, (3 ) with good enough chemical stability. Crystalline silicon is considered to...

Claims

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Application Information

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IPC IPC(8): C25B1/04C25B11/04C25B11/02B82Y30/00B82Y40/00
CPCY02E60/36
Inventor 蒋最敏黄树繁周通林东东
Owner FUDAN UNIV
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