Unlock instant, AI-driven research and patent intelligence for your innovation.

A large-scale solar photocatalytic-photocatalytic water splitting method for hydrogen production

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

Active Publication Date: 2019-04-30
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 the ultraviolet part, and the WO with the widest light absorption range 3 The utilization of the solar spectrum by the catalyst is also very limited, it can only absorb sunlight below 470nm, and the number of photons below 470nm in the solar spectrum is only 3%; WO 3 The highest apparent quantum efficiency reported at present is only 31% (RSC Adv., 2014, 4, 8308-8316), and the conversion efficiency of solar energy to hydrogen energy in the photocatalytic-electrolytic coupling system is less than 0.5%.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A large-scale solar photocatalytic-photocatalytic water splitting method for hydrogen production
  • A large-scale solar photocatalytic-photocatalytic water splitting method for hydrogen production
  • A large-scale solar photocatalytic-photocatalytic water splitting method for hydrogen production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] With the photocatalyst BiVO described in the present invention 4 As an example, hydrothermal synthesis and deposition precipitation method 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 adjusted the pH value with ammonia solution, stirred, then transferred to a round bottom flask at a certain temperature under normal pressure for a certain period of time, after the reaction, centrifuged, washed and dried in an oven. Wherein, the concentration of bismuth source and vanadium source is 1-1000mM (100mM here), the concentration of acid solution is 0.1-15M (1M here), and the concentration of 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 is 15-2...

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 6 shown.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a high-efficiency large-scale solar photocatalysis-photoelectrocatalysis water splitting hydrogen production technology, that is, the powder photocatalyst converts the soluble high-valence electron carrier into a low-valence state under sunlight to realize the large-area storage of solar energy and release simultaneously Oxygen and protons are generated, and an electrolyte solution that stores electron carriers and protons is delivered to the photocatalytic cell. The anode of the photocatalytic cell utilizes sunlight to generate photogenerated carriers to oxidize low-valence electron carriers to high-valence states, and combines protons at the cathode to generate hydrogen. After the hydrogen gas is collected, the electrolyte solution is returned to the photocatalytic system for recycling. The whole reaction is driven by sunlight to realize the conversion of solar energy to 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/10C25B11/06C25B11/08B01J23/847B01J23/888B01J27/06B01J27/13B01J27/18B01J27/24B01J27/26C25B9/19
CPCB01J23/8472B01J23/888B01J27/06B01J27/13B01J27/1817B01J27/24B01J27/26C25B11/04C25B1/04C25B9/73B01J35/39B01J23/22Y02P20/133Y02E60/36C25B1/55C25B9/19
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