Method for preparing hydrogen through photocatalytic decomposition of water by virtue of photosystem II and semiconductor hybrid system

A photosynthetic system and semiconductor technology, applied in hydrogen production, energy input, etc., can solve problems such as serious side reactions, power loss, and increased hydrogen release potential

Active Publication Date: 2015-02-11
ZHANGJIAGANG IND TECH RES INST CO LTD DALIAN INST OF CHEM PHYSICS CHINESE ACADEMY OF SCI +1
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0010] (1) It is necessary to apply a certain bias voltage to promote charge separation and increase the hydrogen discharge potential, resulting in the loss of electric energy;
[0011] (2) The PSII electrode hybrid material cannot effectively decompose water to generate oxygen, and the side reaction is serious, which leads to the rapid deactivation of the material;
[0012] (3) Due to the transmembrane transfer of electrons on the PSII acceptor side, electrons cannot be effectively transferred to the surface of the electrode material, so that the efficiency of water splitting is low;
[0013] (4) The preparation of PSII electrode hybrid materials is complicated, the photocurrent is low, and the working life is very poor

Method used

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  • Method for preparing hydrogen through photocatalytic decomposition of water by virtue of photosystem II and semiconductor hybrid system
  • Method for preparing hydrogen through photocatalytic decomposition of water by virtue of photosystem II and semiconductor hybrid system
  • Method for preparing hydrogen through photocatalytic decomposition of water by virtue of photosystem II and semiconductor hybrid system

Examples

Experimental program
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Effect test

Embodiment 1

[0044] This example illustrates the steps for isolating PSII from spinach leaves:

[0045] Clean the fresh spinach, remove the petiole, leave the intact green leaves, take a certain amount of green leaves and add the solution according to the ratio of 1mL:1g (50mM HEPES-NaOH, 400mM NaCl, 2mMMgCl 2 , 1mM EGTA, 2mg / ml BSA, pH7.5), cut the green leaves with a juicer until they are fine enough to form a slurry, filter the slurry through gauze, divide the filtrate into 250mL centrifuge bottles, and add an appropriate amount of solution (20mM MES-NaOH, 150mM NaCl, 4mM MgCl 2 , pH6.0) after homogenization, the slurry was centrifuged at 12000G and the precipitate was taken, and an appropriate amount of solution (50mM MES-NaOH, 15mM NaCl, 5mM MgCl 2 , pH6.0) after homogenization, slowly add Triton X-100 detergent and shake for 30 minutes, the slurry is centrifuged at 50000G, the green part of the precipitate is taken, and the solution (50mM MES-NaOH, 15mM NaCl, 400mM Sucrose, pH6 .0)...

Embodiment 2

[0047] This example evaluates the activity of PSII to decompose water and produce oxygen in buffer solutions with different pH values.

[0048] Take 100mL of buffer solution and put it in the reactor. Under the condition of weak green light, add a certain concentration of electron carrier and stir to dissolve it, then slowly add a certain amount of PSII, stir to make it evenly dispersed, and pump it under dark conditions. Vacuum, use a circulating water pump to control the temperature of the reaction system, use a xenon lamp for illumination, and use a filter and a filter water jacket to control the wavelength range of the incident light. The hydrogen and oxygen generated by the reaction are detected online by gas chromatography.

[0049] The reaction results are shown in Table 1:

[0050] Table 1

[0051]

[0052] In the above reaction, the buffer solution is 50mM sodium hydrogen phosphate-sodium dihydrogen phosphate and 5mM potassium hydrogen phosphate-potassium dihydrog...

Embodiment 3

[0054] This embodiment illustrates the preparation steps of the CdS photocatalyst used in the PSII and semiconductor hybrid system:

[0055] The semiconductor CdS photocatalyst was synthesized by precipitation hydrothermal method, and 0.14M Na 2 S aqueous solution was slowly added dropwise to 0.14M Cd(OAc) 2 After the aqueous solution forms a precipitate, continue to stir for 24 hours, then let it stand for 24 hours and then filter it. Put the filter cake into a hydrothermal kettle and treat it hydrothermally at 200°C for 72 hours. After filtering and washing, it is vacuum-dried to obtain a CdS sample (its crystal state is as follows: figure 1 ).

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Abstract

The invention provides a method for preparing hydrogen through photocatalytic decomposition of water by virtue of a photosystem II and semiconductor hybrid system, property of oxygen production through high-efficiency photocatalytic decomposition of water by a natural photosynthetic system II and hydrogen production through photocatalytic decomposition of water by a semiconductor material carrying metal cocatalyst can be combined, and hydrogen and oxygen production through full decomposition of water by using visible light can be realized. According to the invention, electron transfer between the photosynthetic system II and the semiconductor material in the hybrid system is realized by reduction and oxidation cycle processes of an iron complex, a cobalt complex, 2,6-dichlorphenolindophenol or quinone compound, under visible light condition, hydrogen production amount per hour of 1mum mol of the photosynthetic system II-semiconductor hybrid system through decomposition of the water can reach 4075 mum mol (calculating as 91 L hydrogen according to a standard state), and the quantum efficiency is 0.11%. The method provides a novel approach for producing cleaning fuel hydrogen by using solar energy.

Description

technical field [0001] The invention belongs to the technical field of solar photochemical conversion to produce clean fuel, and in particular relates to a method for producing hydrogen by photocatalytically decomposing water with a photosynthetic system II and a semiconductor hybrid system. Background technique [0002] With the increasing development of human society, the energy crisis and environmental problems brought about by the consumption of traditional fossil fuels seriously threaten the sustainable development of human beings, and the development of clean and renewable energy is imminent. Among many clean energy forms, solar energy has the advantages of being inexhaustible, clean and pollution-free, and widely distributed. Converting it into a clean fuel that can be stored and transported will be one of the ways to utilize solar energy. As another form of clean energy, hydrogen energy has the advantages of high combustion calorific value and zero emissions. Theref...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/04
CPCY02E60/36Y02P20/133
Inventor 陈钧李灿王旺银
Owner ZHANGJIAGANG IND TECH RES INST CO LTD DALIAN INST OF CHEM PHYSICS CHINESE ACADEMY OF SCI
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