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Method for preparing porous alpha-Fe2O3 photo-anode

A technology of photoanode and thin film, applied in the direction of coating, electrolysis process, electrolysis components, etc., can solve the problems of complicated and expensive preparation process, low photoelectrode performance, etc., and achieve the effect of simple preparation method, easy operation and mild conditions

Active Publication Date: 2016-05-25
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Currently, preparation α -Fe 2 o 3 The main methods of photoanodes are atmospheric pressure chemical vapor deposition, spray pyrolysis, sol spraying, etc., but the preparation of these methods α -Fe 2 o 3 There are still some problems in the photoanode: for example, the performance of the photoelectrode is not high; the preparation process is complicated and expensive

Method used

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Effect test

Embodiment 1

[0025] Porous α -Fe 2 o 3 The preparation steps of the photoanode include: ultrasonically cleaning the FTO sheet with acetone and absolute ethanol for 20 minutes to remove chemical oil stains, then rinsing with deionized water, and air-drying for later use; and 6.0 mu mol of isopropyl titanate was dissolved in 20mL deionized water; the solution was transferred to a stainless steel reactor with a volume of 30mL lined with polytetrafluoromaterial, and a piece of size 2×4cm 2 Place the clean FTO sheet in the reaction kettle and react at 100°C for 10h. After the reaction, let it cool naturally. , then place it flat in a porcelain boat pre-installed with graphite, and heat it in a microwave oven for 12 minutes to obtain the porous α -Fe 2 o 3 film.

Embodiment 2

[0027] Porous α -Fe 2 o 3 The preparation steps of the photoanode include: ultrasonically cleaning the FTO sheet with acetone and absolute ethanol for 20 minutes to remove chemical oil stains, then rinsing with deionized water, and air-drying for use; 15mmol of ferric nitrate, 7.5mmol of Isopropyl titanate was dissolved in 15mL deionized water, and the solution was transferred to a 30mL stainless steel reaction kettle lined with polytetrafluoro material, and a piece of size 2×4cm 2 Place the clean FTO in the reaction kettle and react at 80°C for 24h. After the reaction, let it cool naturally. , then place it flat in a porcelain boat pre-installed with silicon carbide powder, and heat it in a microwave oven for 3 minutes to obtain the porous α -Fe 2 o 3 film.

Embodiment 3

[0029] Porous α -Fe 2 o 3 The preparation steps of the photoanode include: ultrasonically cleaning the FTO sheet with acetone and absolute ethanol for 20 minutes to remove chemical oil stains, then rinsing it with deionized water, and drying it naturally for use; Dissolve 0.3mmol of titanium oxychloride in 24mL of deionized water, transfer the solution to a 30mL stainless steel reaction kettle lined with polytetrafluoromaterial, take a piece with a size of 2×4cm 2 Place the clean FTO in the reaction kettle and react at 120°C for 4 hours. After the reaction, let it cool naturally. , put it flat in a porcelain boat pre-installed with silicon carbide powder, and heat it in a microwave oven for 20 minutes to obtain the porous α -Fe 2 o 3 film.

[0030] prepared porous α -Fe 2 o 3 The photoanode is used in photoelectric water splitting. The test conditions for its performance: In the three-electrode system, 1.0mol / L NaOH aqueous solution is the electrolyte solution, α -Fe...

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Abstract

The invention discloses a method for preparing a porous alpha-Fe2O3 photo-anode and belongs to the technical field of photoelectric water decomposition. The method uses fluorine doped SnO2 conductive glass (FTO) as a substrate, a FeOOH film uniformly grows on an FTO surface through hydrothermal reaction, and then a photo-anode material of an alpha-Fe2O3 film with pores formed in the surface is prepared through microwave assisted heating. The method is simple in operation, mild in reaction condition, short in reaction period and high in repeatability, raw materials are cheap and are easy to obtain, complicated and expensive devices are not needed, the preparation cost is low, the prepared material has excellent oxygen production performance when being applied to photoelectric water decomposition, the photoelectric current density can be up to 2.4 mA / cm<2> under the simulated sunlight irradiation compared with a reversible hydrogen electrode 1.23 V, and the method has wide application prospect on the aspect of development of sustainable clean energy.

Description

technical field [0001] The invention belongs to the technical field of photoelectric water splitting, in particular to a method for preparing porous α -Fe 2 o 3 Photoanodic method. Background technique [0002] Hydrogen is a clean, recyclable substance that is considered an ideal energy carrier that can be efficiently converted into usable effective energy without causing environmental problems. Hydrogen production by photoelectric water splitting is one of the most promising and cleanest hydrogen production methods, but since the oxygen production process is a relatively difficult reaction in the process of photolytic water splitting, the development of highly active photoanodes The topic of materials to improve hydrogen production efficiency has been extensively studied. Among many photoanode materials, α -Fe 2 o 3 It has attracted much attention because of its suitable energy band structure, good sunlight absorption, cheap and non-toxic, and good chemical stability...

Claims

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Application Information

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IPC IPC(8): C03C17/34C25B1/04
CPCC03C17/3417C03C2218/111C25B1/04Y02E60/36
Inventor 侯乙东郑冲丁正新戴文新王心晨
Owner FUZHOU UNIV
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