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Preparation method and application of α-fe2o3 porous nanorod array photoanode material

A nanorod array, photoanode technology, applied in metal material coating process, electrode, liquid chemical plating and other directions, to achieve the effect of convenient operation, shortened transmission distance and excellent performance

Active Publication Date: 2019-02-22
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] while using FeCl 3 Two-step Synthesis of α-Fe with Dicyandiamide and Formaldehyde Condensate in Situ Liquid-Solidification Method 2 o 3 The invention method of porous nanorod array photoanode material has not been reported yet

Method used

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  • Preparation method and application of α-fe2o3 porous nanorod array photoanode material
  • Preparation method and application of α-fe2o3 porous nanorod array photoanode material
  • Preparation method and application of α-fe2o3 porous nanorod array photoanode material

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Experimental program
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Effect test

Embodiment 1

[0030] an α-Fe 2 o 3 Porous nanorod array photoanode material is synthesized and prepared by in-situ liquid-solidification method in two steps. The specific steps are: (1) Immerse the FTO conductive glass into FeCl containing 0.1mol / L 3 and 0.1mol / L dicyandiamide / formaldehyde polycondensate aqueous solution, then use dilute hydrochloric acid to adjust pH=1.5, react at 95°C for 6h, cool, wash, and dry to prepare β-FeOOH nanorod arrays; (2) The β-FeOOH nanorod array prepared in step (1) was placed on the N 2 Under the atmosphere, heat treatment at 550°C for 2h, continue heat treatment at 800°C for 0.1h, and cool naturally to obtain α-Fe 2 o 3 The porous nanorod array photoanode material can be seen from the actual production situation that the prepared material is uniformly covered on the FTO conductive glass substrate and is bright red. The obtained material is used as photoanode material for hydrogen production by photoelectric hydrolysis.

[0031] Figure 1a and Figure...

Embodiment 2

[0038] an α-Fe 2 o 3 Porous nanorod array photoanode material is synthesized and prepared by in-situ liquid-solidification method in two steps. The specific steps are: (1) Immerse FTO conductive glass into FeCl containing 0.05mol / L 3 in the aqueous solution, and then use dilute hydrochloric acid to adjust the pH=1.5, react at 95°C for 9h, cool, wash with water, and dry to obtain the β-FeOOH nanorod array; (2) the β-FeOOH nanorod array prepared in step (1) in N 2 Under the atmosphere, heat treatment at 550°C for 2h, continue heat treatment at 800°C for 0.1h, and cool naturally to obtain α-Fe 2 o 3 The nanorod array material is used as a photoanode material for hydrogen production by photoelectric hydrolysis.

[0039] The test results show that: the prepared α-Fe 2 o 3 It is a smooth nanorod array with a forbidden band width of 2.09eV, a photoelectric hydrolysis reaction onset potential of 0.90 V vs. RHE, and a photocurrent density of 0.65 mA / cm at 1.23 V vs. RHE 2 , the ...

Embodiment 3

[0041] an α-Fe 2 o 3 Porous nanorod array photoanode material is synthesized and prepared by in-situ liquid-solidification method in two steps. The specific steps are: (1) Immerse FTO conductive glass into FeCl containing 0.15mol / L 3 and 0.05mol / L dicyandiamide / formaldehyde polycondensate aqueous solution, then use dilute hydrochloric acid to adjust pH=1.5, react at 95°C for 12h, cool, wash, and dry to prepare β-FeOOH nanorod arrays; (2) The β-FeOOH nanorod array prepared in step (1) was placed on the N 2 Under the atmosphere, heat treatment at 550°C for 2h, continue heat treatment at 800°C for 0.1h, and cool naturally to obtain α-Fe 2 o 3 The nanorod array material is used as a photoanode material for hydrogen production by photoelectric hydrolysis.

[0042] The test results show that: the prepared α-Fe 2 o 3 It is a porous nanorod array with a forbidden band width of 2.03eV, its photoelectric hydrolysis reaction onset potential is 0.80 V vs. RHE, and the photocurrent d...

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Abstract

The invention relates to an alpha-Fe2O3 porous nano bar photo-anode material for photoelectric hydrolysis hydrogen production. The liquid-solid chemical method is used for in-situ preparing of an FTO conductive glass base body loaded alpha-Fe2O3 porous nano bar and the photo-anode material comprising the above alpha-Fe2O3 porous nano bar. According to the specific preparing method, in-situ growing of a beta-FeOOH nano bar array is conducted on an FTO conductive glass base body in an FeCl3 containing dicyandiamide and sulphonated acetone-formaldehyde plymer water solution, high-temperature heat treatment is conducted, and the one-dimension alpha-Fe2O3 porous nano bar array photo-anode material is obtained. By adoption of the alpha-Fe2O3 porous nano bar array photo-anode material prepared through the method, wetting of an electrolyte in the photo-anode material can be improved, the transmission distance of photon-generated carriers is shortened, and the photoelectric hydrolysis hydrogen production efficiency is improved. According to the preparing method, operation is convenient, simple and easy to control, and the prepared photo-anode material has important application potentials in the aspects such as photoelectric catalysis.

Description

technical field [0001] The invention belongs to the technical field of photoelectrocatalytic hydrogen production, in particular to an α-Fe 2 o 3 Preparation method and application of porous nanorod array photoanode material. Background technique [0002] Photoelectric hydrolysis hydrogen production technology is a promising way to convert solar energy into chemical energy. However, the photoelectrocatalytic efficiency of photoelectrode materials has always been the bottleneck restricting the development of solar hydrolysis hydrogen production. The photoelectric reaction is usually carried out in a photoelectrochemical cell (PEC), usually using an n-type semiconductor material as the photoanode and a metal as the cathode. When sunlight shines on the photoanode material, the photoanode material excites the generated hole-electron pairs (h + -e - ) to participate in the following electrode reactions to split water to produce H 2 and O 2 (Formula 1, 2): [0003] [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/06C25B1/04C23C18/12
CPCC23C18/1216C25B1/04C25B11/077Y02E60/36
Inventor 刘光李晋平赵勇王开放
Owner TAIYUAN UNIV OF TECH
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