Large-scale solar water decomposition hydrogen production method based on photocatalysis - photoelectrocatalysis

A photocatalytic and photocatalytic technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of limited utilization of the solar spectrum of catalysts, insufficient efficiency, and safety Hidden dangers and other problems, to achieve the effect of promoting the separation of photogenerated charges, solving difficulties in storage, and good crystallinity

Active Publication Date: 2017-08-04
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the process equipment of the powder photocatalyst system is simple but the efficiency is very low, and the generated hydrogen and oxygen are mixed together, which will bring great safety hazards in future applications. H 2 with O 2 The problem of separation is a big challenge
However, this patent needs to provide additional electric energy input, and the required bias voltage is above 0.85V; and the photocatalyst (WO 3 、TiO 2 , SrTiO 3 etc.) The light absorption range is concentrated in

Method used

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  • Large-scale solar water decomposition hydrogen production method based on photocatalysis - photoelectrocatalysis
  • Large-scale solar water decomposition hydrogen production method based on photocatalysis - photoelectrocatalysis
  • Large-scale solar water decomposition hydrogen production method based on photocatalysis - photoelectrocatalysis

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Embodiment 1

[0056] With the photocatalyst BiVO described in the present invention 4 As an example, hydrothermal synthesis and deposition precipitation are used for synthesis. The synthesis process is as follows: respectively dissolve bismuth source (100mM) and vanadium source (100mM) in acid solution, mix them evenly at a volume ratio of 1:1, and add structure-oriented (0.05mM) solution, gradually adjust the pH value with ammonia solution, stir, then transfer to a round bottom flask at a certain temperature under normal pressure and keep it for a certain period of time. After the reaction, centrifuge, wash and dry in an oven. Wherein, the concentration of the bismuth source and the vanadium source is 1-1000mM (100mM here), the concentration of the acid solution is 0.1-15M (1M here), and the concentration of the structure-directing agent solution is 0.1-10mM (1mM here). ), the pH value is adjusted to 0-10 (here it is 5), the stirring time is 0.1-5h (here it is 3h), the reaction temperature...

Embodiment 2

[0059] Performance Evaluation of Photocatalysts in Water Oxidation in the Presence of Different Electron Carriers

[0060] 100mg of photocatalyst was dispersed in 150mL of different electron carrier solutions (10mM), and then the reaction system was evacuated, under the condition of 300W xenon lamp (λ>420nm) light, after reaction for 1h, samples were taken for analysis, and the gas phase products obtained from the reaction were detected online by gas chromatography , by detecting the amount of oxygen generated by the oxidation reaction to calculate the conversion rate of the high-valence electron carrier, the results are listed in Table 1.

[0061] Table 1. Reactivity of photocatalysts in the presence of different electron carriers

[0062]

[0063]

Embodiment 3

[0065] Photocatalyst in Fe 3+ Time-dependent evaluation of photocatalytic water oxidation reaction in ionic system (based on BiVO 4 Photocatalyst as an example)

[0066] 100mg photocatalyst BiVO 4 dispersed in Fe 3+ solution (150mL), then evacuate the reaction system, under the condition of 300W xenon lamp (λ>420nm) light, after a certain period of time, take a sample for analysis, and the gas phase product obtained by the reaction is detected online by gas chromatography. Fe 3+ Two solutions of 3.5mM and 10.0mM were selected respectively, and the reaction can make Fe 3+ Complete conversion of Fe 2+ , generating stoichiometric O 2 , which is in full agreement with the theoretical value, proving that the photocatalyst can completely convert Fe 3+ to Fe 2+ , that is, there is no reverse reaction, and the obtained data are as follows Figure 5 shown.

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Abstract

The invention provides a high-efficiency large-scale solar water decomposition hydrogen production technique based on photocatalysis - photoelectrocatalysis. The technique comprises the following steps that soluble high-valence electron carriers are converted into low-valence electron carriers by a powdered photocatalyst under illumination of the sun, so that large-area solar storage is realized, besides, oxygen is emitted, and protons are generated; an electrolyte solution storing the electron carriers and the protons is conveyed into a photoelectrocatalysis basin; and a photon-generated carrier is generated at the anode of the photoelectrocatalysis basin by utilizing the sunlight, so that the low-valence electron carriers are oxidized into the high-valence electron carriers, and protons are combined at the cathode of the photoelectrocatalysis basin to generate hydrogen. After the hydrogen is collected, the electrolyte solution is returned to a photocatalysis system for recycling. The whole reaction is driven by sunlight to realize the conversion of solar energy into hydrogen energy.

Description

technical field [0001] The invention relates to the technical field of photochemical conversion of solar energy to produce solar fuel, in particular to a technology for realizing large-scale solar water splitting hydrogen production through a coupling system of photocatalysis and photoelectric catalysis. Background technique [0002] As a clean energy, hydrogen has the advantages of high combustion value and zero pollution emission, and is often used as a hydrogen source for fuel cells and hydrogen-powered vehicles. At the same time, it is also a commonly used industrial raw material, widely used in synthetic ammonia, petroleum hydrocracking, and metallurgical industries. At present, the production of hydrogen mostly relies on catalytic reforming reactions based on fossil resources (such as: C+2H 2 O→2H 2 +CO 2 ), it can be seen that every ton of H produced 2 , needs to consume 3 tons of coal and generate 11 tons of CO 2 , Such a high carbon emission will undoubtedly ha...

Claims

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Application Information

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IPC IPC(8): C25B1/10C25B11/06C25B11/08B01J23/847B01J23/888B01J27/06B01J27/13B01J27/18B01J27/24B01J27/26C25B9/19
CPCB01J23/8472B01J23/888B01J27/06B01J27/13B01J27/1817B01J27/24B01J27/26B01J35/004C25B11/04C25B1/04C25B9/73B01J23/22B01J35/002Y02P20/133Y02E60/36C25B1/55C25B9/19
Inventor 李灿李仁贵赵越秦炜丁春梅董延宝
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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