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Preparation method of titanium-doped iron oxide photo-anode with high photoelectric water decomposition performance

A technology of decomposition performance and iron oxide light, applied in chemical instruments and methods, electrodes, electrolysis process, etc., can solve the problems of high turn-on voltage and low photocurrent density of titanium-doped iron oxide photoelectrode, so as to reduce turn-on voltage and improve Photoelectric water splitting performance and high yield effect

Active Publication Date: 2020-07-03
HUAQIAO UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a method for preparing a titanium-doped iron oxide photoanode with high photoelectric water splitting performance, and to solve the problem of the photocurrent density of the titanium-doped iron oxide photoelectrode in the above-mentioned background technology The problem with defects of low and high turn-on voltage

Method used

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  • Preparation method of titanium-doped iron oxide photo-anode with high photoelectric water decomposition performance
  • Preparation method of titanium-doped iron oxide photo-anode with high photoelectric water decomposition performance
  • Preparation method of titanium-doped iron oxide photo-anode with high photoelectric water decomposition performance

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Embodiment 1

[0029] A method for preparing a titanium-doped iron oxide photoanode with high photoelectric water splitting performance in this embodiment comprises the following steps:

[0030] 1) 0.61g ferric chloride hexahydrate (FeCl 3 ·6H 2 O) Dissolve in 100mL water, stir to dissolve, then add 0.34g sodium acetate (CH 3 COONa), after continuing to stir and dissolve, adjust the pH to 1.5 with 37% concentrated hydrochloric acid, after stirring for 10min, pour it into a 50mL hydrothermal reaction kettle, take 1×2cm 2 A clean FTO glass of the size is vertically immersed in the mixed solution. The reaction kettle was placed in an oven at 95°C for 3 h. After the reaction, the FTO glass was taken out, washed and dried to obtain a β-FeOOH electrode.

[0031] 2) Prepare a butyl titanate ethanol solution with a volume fraction of 1%. The specific preparation method is as follows: add 40 μL of butyl titanate into 4 mL of ethanol, shake to dissolve. Immerse the β-FeOOH electrode in the butyl ...

Embodiment 2

[0036] The difference between embodiment 2 and embodiment 1 is: 0.61g ferric trichloride hexahydrate (FeCl 3 ·6H 2 O) Dissolve in 100mL water, stir to dissolve, then add 0.34g sodium acetate (CH 3 COONa), after continuing to stir and dissolve, adjust the pH to 1.5 with 37% concentrated hydrochloric acid, after stirring for 10min, pour it into a 50mL hydrothermal reaction kettle, take 1×2cm 2A clean FTO glass of the size is vertically immersed in the mixed solution. The reaction kettle was placed in an oven at 95°C for 6 h. After the reaction, the FTO glass was taken out, washed and dried to obtain a β-FeOOH electrode. Prepare a butyl titanate ethanol solution with a volume fraction of 1%, put the obtained β-FeOOH:Ti electrode into a muffle furnace for roasting, and roast it at a heating rate of 10 °C / min to 750 °C for 15 min to obtain Fe 2 o 3 : Ti electrode. the Fe 2 o 3 : The Ti electrode was immersed in a 50mL hydrothermal kettle containing 10mL of methanol, placed ...

Embodiment 3

[0038] 0.61g ferric chloride hexahydrate (FeCl 3 ·6H 2 O) Dissolve in 100mL water, stir to dissolve, then add 0.21g sodium nitrate (NaNO 3 ), continue stirring and dissolving, adjust the pH to 1.5 with 37% concentrated hydrochloric acid, stir for 10 minutes, pour into a 50mL hydrothermal reaction kettle, take 1×2cm 2 A clean FTO glass of the size is vertically immersed in the mixed solution. The reaction kettle was placed in an oven at 95°C for 3 h. After the reaction, the FTO glass was taken out, washed and dried to obtain a β-FeOOH electrode. Prepare a butyl titanate ethanol solution with a volume fraction of 1%, immerse the β-FeOOH electrode in the butyl titanate solution, take it out after 5s, place it on a flat surface, and let it dry naturally. Put the obtained β-FeOOH:Ti electrode into a muffle furnace and bake it at a heating rate of 10°C / min to 750°C for 15 minutes to obtain Fe 2 o 3 : Ti electrode. the Fe 2 o 3 : The Ti electrode was immersed in a 50mL hydro...

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Abstract

The invention discloses a preparation method of a titanium-doped iron oxide photo-anode with a high photoelectric water decomposition performance. The preparation method comprises the following steps:generating beta-FeOOH on a conductive substrate through hydrothermal synthesis, and carrying out butyl titanate solution soaking and heat treatment to obtain a titanium-doped iron oxide (Fe2O3:Ti) photo-anode; then carrying out solvothermal treatment on the obtained titanium-doped iron oxide electrode to obtain Fe2O3:Ti-M; and finally, carrying out hydrothermal treatment on the Fe2O3: Ti-M through an acid solution. After two-step treatment, oxygen vacancies and other surface defects are introduced to the surface of the Fe2O3:Ti photo-anode, the surface hydrophilicity of the Fe2O3:Ti photo-anode is remarkably improved, the photoelectric water decomposition reaction performance of the Fe2O3:Ti photo-anode obtained through the method is remarkably improved, and the titanium-doped iron oxidephoto-anode has high application value in the future industrial aspect.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and in particular relates to a preparation method of a titanium-doped iron oxide photoanode with high photoelectric water splitting performance. Background technique [0002] In the field of photocatalytic water splitting, iron oxide (Fe 2 o 3 ) photoanodes have attracted extensive attention from researchers due to their wide light absorption range, good stability, low cost and non-toxicity. However, Fe 2 o 3 Poor conductivity and short lifetime of photogenerated carriers lead to short diffusion distance of photogenerated holes, resulting in low photocurrent density. Metal ions (such as Ti 4+ ) doping improves its electrical conductivity, which can increase the photocurrent density to a certain extent. In addition, Fe 2 o 3 There are a large number of surface states on the surface, and the surface charge recombination is serious, which makes the surface water oxidation reacti...

Claims

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Application Information

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IPC IPC(8): C25B1/04C25B11/06B01J23/745
CPCC25B1/04B01J23/745C25B1/55C25B11/051C25B11/091B01J35/33Y02E60/36
Inventor 肖静冉詹国武周树锋
Owner HUAQIAO UNIVERSITY
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