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Preparation method of micro/nano alpha-Fe2O3 photoelectrode

A micro-nano structure, -fe2o3 technology, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve the problems of high preparation temperature and cumbersome process, and achieve high current density and enhanced specific surface area , good thermal stability and chemical stability

Inactive Publication Date: 2014-01-29
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently α-Fe 2 o 3 The preparation methods of photoelectrodes mainly include solution method, magnetron sputtering, chemical vapor deposition, etc. The preparation temperature of this kind of method is high (> 400 ℃), and the process is cumbersome.

Method used

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  • Preparation method of micro/nano alpha-Fe2O3 photoelectrode
  • Preparation method of micro/nano alpha-Fe2O3 photoelectrode
  • Preparation method of micro/nano alpha-Fe2O3 photoelectrode

Examples

Experimental program
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Effect test

Embodiment 1

[0025] A specific mode of the present invention is that a kind of α-Fe with micro-nano structure 2 o 3 The preparation method of photoelectrode, its specific practice is:

[0026] a, processing metal substrates

[0027] Get stainless steel sheet and titanium sheet, make its area ratio be 2.5 (the area of ​​stainless steel sheet is 3.6cm 2 , the titanium sheet area is 1.44cm 2 ), polished with 400, 600, 800 mesh sandpaper in turn, and cleaned 3 times with deionized water and absolute ethanol; put the cleaned above-mentioned materials in absolute ethanol for 30 minutes, and take them out for later use;

[0028] b. Configure electroplating solution

[0029] The electroplating solution is 50mL of FeCl with a concentration of 450g / L 2 Solution, add 0.0722g of ascorbic acid, 0.0444g of ammonium fluoride, 0.0344g of compound amino acid as a stabilizer, and 0.0043g of citric acid as a buffer; add 2.5mL of hydrochloric acid with a concentration of 1mol / L to provide an acidic envir...

Embodiment 2

[0039] The specific approach in this example is:

[0040] a, processing metal substrates

[0041] Get stainless steel sheet and titanium sheet, make its area ratio be 2.5 (the area of ​​stainless steel sheet is 3.6cm 2 , the titanium sheet area is 1.44cm 2 ), followed by polishing with 400, 600, 800 mesh sandpaper, and cleaning 5 times with deionized water and absolute ethanol; put the cleaned above-mentioned materials in absolute ethanol for 30 minutes and take them out for later use;

[0042] b. Configure electroplating solution

[0043] The electroplating solution is 50mL of FeCl with a concentration of 450g / L 2 Solution, add 0.0722g of ascorbic acid, 0.0444g of ammonium fluoride, 0.0344g of compound amino acid as a stabilizer, and 0.0043g of citric acid as a buffer; add 2.5mL of hydrochloric acid with a concentration of 1mol / L to provide an acidic environment;

[0044] c. Electroplating

[0045] The titanium sheet is used as the cathode, the stainless steel sheet is u...

Embodiment 3

[0052] The specific approach in this example is:

[0053] a, processing metal substrates

[0054] Get stainless steel sheet and titanium sheet, make its area ratio be 2.5 (the area of ​​stainless steel sheet is 3.6cm 2 , the titanium sheet area is 1.44cm 2 ), polished successively with 400, 600, 800-purpose sandpaper, and cleaned 4 times with deionized water and absolute ethanol; the above-mentioned materials cleaned were placed in absolute ethanol for 30 minutes, and were taken out for subsequent use;

[0055] b. Configure electroplating solution

[0056] The electroplating solution is 50mL of FeCl with a concentration of 450g / L 2 Solution, add 0.0722g of ascorbic acid, 0.0444g of ammonium fluoride, 0.0344g of compound amino acid as a stabilizer, and 0.0043g of citric acid as a buffer; add 2.5mL of hydrochloric acid with a concentration of 1mol / L to provide an acidic environment;

[0057] c. Electroplating

[0058] The titanium sheet is used as the cathode, the stainless...

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Abstract

The invention discloses a preparation method of a micro / nano alpha-Fe2O3 photoelectrode, comprising the following steps: taking a stainless steel sheet and a titanium sheet, polishing with sand paper, cleaning, carrying out ultrasonic processing on the clean materials, and taking out for subsequent use; preparing a plating solution, using the titanium sheet as a cathode and stainless steel sheet as an anode, electroplating for 3-5 s at a room temperature of 30 DEG C by using a regulated DC power supply, then taking out the titanium sheet, cleaning and drying to obtain a nano iron cube, then sintering the titanium sheet covered with the nano iron cube in a muffle furnace, and taking out obtain the micro / nano alpha-Fe2O3 photoelectrode. According to the invention, the method has the advantages of simple device and low energy consumption, and is suitable for large scale production; simultaneously the prepared micro / nano alpha-Fe2O3 is speherical and can omni-directionally reflect a light; a plurality of nano ribbons are distributed on the surface of the micro / nano sphere, thus the specific surface area of the electrode can be further enhanced; the prepared micro / nano sphere used as the photoelectrode has high light utilization rate and large current density.

Description

technical field [0001] The invention relates to a kind of α-Fe with micro-nano structure 2 o 3 Preparation method of photoelectrode. Background technique [0002] With the raising of energy issues, finding clean and renewable energy has become an important research content. Among them, the use of solar photocatalytic water splitting to produce hydrogen is regarded as an important clean energy preparation technology, which has attracted great attention from scientists at home and abroad. The principle of solar photocatalytic water splitting to produce hydrogen is as follows: when light is irradiated on a semiconductor, when the energy of the photon is greater than or equal to the forbidden band width of the semiconductor, the electrons in the semiconductor are excited to transition from the valence band to the conduction band, while the holes remain In the valence band, the electrons and holes are separated, and then the water is reduced to hydrogen at different positions ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/745B01J35/08B01J37/34
Inventor 杨峰史占花赵勇
Owner SOUTHWEST JIAOTONG UNIV