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Preparing method and application of alpha-Fe2O3 porous nano bar array photo-anode 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: 2017-10-20
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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  • Preparing method and application of alpha-Fe2O3 porous nano bar array photo-anode material
  • Preparing method and application of alpha-Fe2O3 porous nano bar array photo-anode material
  • Preparing method and application of alpha-Fe2O3 porous nano bar array photo-anode material

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Experimental program
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Effect test

Embodiment 1

[0030] A kind of α-Fe 2 O 3 The porous nanorod array photoanode material is prepared by in-situ liquid-curing two-step synthesis. The specific steps are: (1) Immerse FTO conductive glass with 0.1mol / L FeCl 3 And 0.1mol / L dicyandiamide / formaldehyde polycondensate aqueous solution, then adjust pH=1.5 with dilute hydrochloric acid, react at 95℃ for 6h, cool, wash and dry to prepare β-FeOOH nanorod array; (2) Place the β-FeOOH nanorod array prepared in step (1) in N 2 In 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, it can be seen from the actual situation that the prepared material is uniformly covered on the FTO conductive glass substrate, and it is bright red. The prepared material is used as a photoanode material for photoelectric hydrolysis to produce hydrogen.

[0031] Figure 1a with Figure 1b Is α-Fe 2 O 3 Scanning electron micrograph of porous nan...

Embodiment 2

[0038] A kind of α-Fe 2 O 3 The porous nanorod array photoanode material is prepared by in-situ liquid-curing two-step synthesis. The specific steps are: (1) Immerse FTO conductive glass with 0.05mol / L FeCl 3 In the aqueous solution, the pH is adjusted to 1.5 with dilute hydrochloric acid, reacted at 95℃ for 9 hours, cooled, washed with water, and dried to prepare the β-FeOOH nanorod array; (2) The β-FeOOH nanorod array prepared in step (1) In N 2 In 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 Nanorod array materials, the prepared materials are used as photoanode materials for photoelectric hydrolysis to produce hydrogen.

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

Embodiment 3

[0041] A kind of α-Fe 2 O 3 The porous nanorod array photoanode material is prepared by in-situ liquid-curing two-step synthesis. The specific steps are as follows: (1) Immerse FTO conductive glass with FeCl containing 0.15mol / L 3 And 0.05mol / L dicyandiamide / formaldehyde polycondensate aqueous solution, then adjust pH=1.5 with dilute hydrochloric acid, react at 95℃ for 12h, cool, wash, and dry to prepare β-FeOOH nanorod array; (2) Place the β-FeOOH nanorod array prepared in step (1) in N 2 In 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 Nanorod array materials, the prepared materials are used as photoanode materials for photoelectric hydrolysis to produce hydrogen.

[0042] The test results show that: the prepared α-Fe 2 O 3 It is a porous nanorod array with a band gap of 2.03eV, and its photoelectric hydrolysis reaction starting potential is 0.80 V vs. RHE, and the photocurrent density at 1.23 V ...

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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 photoelectric catalytic hydrogen production, and is specifically 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 a bottleneck restricting the development of solar hydrolysis hydrogen production. The photoelectric reaction is usually carried out in a photoelectrochemical cell (PEC), and n-type semiconductor materials are usually used as the photoanode and metal as the cathode. When sunlight hits the photoanode material, the photoanode material excites the hole-electron pair (h + -e - ) Participate in the following electrode reactions to split water to produce H 2 And O 2 (Formulas 1, 2): [0003] [0004] Experiments have proved t...

Claims

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Application Information

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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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