Method for producing hydrogen by visible light-driven microalgae electrolytic cell-based decomposition of water

An electrolysis battery and visible light technology, applied in the electrolysis process, electrolysis components, etc., can solve the problems of complex and expensive protein separation and stabilization technology, restriction of electron transfer efficiency, serious diffusion limitation, etc., to reduce the diffusion distance and reduce the recombination. Risk, the effect of simple process

Inactive Publication Date: 2013-06-12
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

M. Separated PSII, PSI and hydrogenase to carry out the assembly and photocurrent research of important protein bodies and electrochemical systems of photosystems, and obtained the highest current density of 18 microamperes / cm 2 photocurrent, but its electrode area is small, only 2 square millimeters, and protein separation and stabilization techniques are complex and expensive
[0003] Looking at these similar studies, the key issue is how to realize the efficient transfer of electrons between the biochemical reaction center and the electrode of the battery. Immobilizing microalgae cells or photosynthetic hydrogen production centers on the electrode materials can effectively solve this problem. In the existing research, carbon paste electrodes are mostly used, with small area and serious diffusion limitation, which restricts the improvement of electron transfer efficiency.
Although there are a lot of reports on the immobilization of algae cells in existing studies, green algae bioelectrodes are prepared on large-area flat-plate electrode materials by immobilizing algae cells, and combined with the use of mediators, they are applied to the research of light-induced electron transfer and hydrogen production from water decomposition. , have not been reported at home and abroad

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  • Method for producing hydrogen by visible light-driven microalgae electrolytic cell-based decomposition of water
  • Method for producing hydrogen by visible light-driven microalgae electrolytic cell-based decomposition of water
  • Method for producing hydrogen by visible light-driven microalgae electrolytic cell-based decomposition of water

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Embodiment example

[0034] Two embodiments of the present invention are described in detail below.

[0035] like figure 2 As shown, the microalgae electrolysis cell includes an anode chamber and a cathode chamber. The anode chamber and the cathode chamber are connected in a liquid phase at the bottom, and the upper and middle parts are separated by a gas separator to collect the released oxygen and hydrogen separately, without the need for hydrogen and oxygen separation; A proton exchange membrane or a porous plate is arranged as a separator at the direct connection between the anode chamber and the cathode chamber bottom of the microalgae electrolysis cell.

[0036] The described visible light-driven microalgae electrolysis cell decomposes water to produce hydrogen, uses the microalgae bioelectrode as the photoanode, constitutes a three-electrode system with the cathode and the reference electrode, and adds an electron mediator to the electrolytic cell solution to perform oxygen release and De...

Embodiment 1

[0043] Photoresponse of Subcardioid Tetraspermum Photoelectrode to Light

[0044](1) Preparation of silica sol: slowly drop 10mL tetraethoxysilane into a stirring system of 60mL water and 30mL 0.01M HCl, react for 50h, adjust the pH to 7.50 with 1M NaOH solution, then react for 48h, the silica sol The pH is 7.81, and the prepared silica sol is ready for use.

[0045] (2) In the late logarithmic period of growth, the concentration is about 3.50×10 6 cells / mL of 57 mL of Tetraspermum subcardiac, concentrated by centrifugation at 2000 r / min for 1 min, and after discarding the supernatant, the algal cells were obtained. The algal cells obtained by centrifugation were resuspended in 2 mL of silica sol, the volume of the algae-silica sol mixture was pipetted to 50 μL, and air-dried to prepare a green algae bioelectrode.

[0046] (3) In the three-electrode system, the anode is a bioelectrode of green algae, the cathode is a platinum electrode or a titanium electrode, the reference ...

Embodiment 2

[0049] Visible light-driven microalgae electrolysis cell decomposes water to release hydrogen and oxygen

[0050] (1) Preparation of silica sol: slowly drop 10mL tetraethoxysilane into a stirring system of 60mL water and 30mL 0.01M HCl, react for 48h, adjust the pH to 7.49 with 1M NaOH solution, and then react for 4 days, the silica sol The pH is 8.0, and the prepared silica sol is ready for use.

[0051] (2) Take the concentration of about 2.64×10 6 38mL of cells / mL Tetraspermia subcardiac, Fv / Fm=0.754, yield=0.606 of the algal cells, concentrated by centrifugation at 2000r / min for 1min, and poured off the supernatant, the algal cells were obtained. The algal cells obtained by centrifugation were resuspended in 1 mL of silica sol, and the volume of the algae-silica sol mixture was pipetted to 50 μL, and air-dried to prepare a green algae bioelectrode.

[0052] (3) In the three-electrode system, the anode is a bioelectrode of green algae, the cathode is a platinum electrode ...

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Abstract

The invention relates to a method for producing hydrogen by visible light-driven microalgae electrolytic cell-based decomposition of water. The method comprises the following steps that in a microalgae electrolytic cell with an electrolyte solution, in the presence of a microalgae photoelectrode as an anode, an electronic mediator is added into the electrolyte solution and external voltage is applied between the anode and a cathode; under visible light driving, microalgae cells decompose water into oxygen, electrons and protons by a photosynthetic system II; and the electrons are carried to the anode by the electronic mediator, then are carried to the cathode under the applied voltage and then are bonded with the protons in the electrolyte solution to produce hydrogen. The microalgae electrolytic cell can realize water anodic oxidation under visible light driving. Under synchronous irradiation of light currents and visible light, oxygen and hydrogen are synchronously released from surfaces of the anode and the cathode. The method has a hydrogen production rate of 16.4 microliters per hour and compared with the indirect hydrogen production method, the method provided by the invention improves the hydrogen production rate by 40 times. The method has a low electrode preparation cost and high hydrogen production efficiency, avoids hydrogen-oxygen separation and realizes efficient, sustaining and table preparation of hydrogen energy.

Description

technical field [0001] The invention relates to a method for producing hydrogen by decomposing water in a microalgae electrolytic cell driven by visible light, that is, in a microalgae electrolytic cell added with an electrolyte solution, a planar porous electrode material is used as a base material, and microalgae cells are fixed thereon to prepare microalgae The photoelectrode is used as the anode, and constitutes a three-electrode system with the cathode and the reference electrode. An electron mediator is added to the electrolyte solution, and an external voltage is applied between the anode and the cathode; driven by visible light, the microalgal cells decompose through the photosynthetic system II of photosynthesis Water generates oxygen, electrons and protons, and the electrons pass through the cell membrane through the electron mediator to reach the surface of the substrate material of the electrode, and the electrons are transferred to the cathode under the action of a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/06
CPCY02E60/36
Inventor 陈兆安吕艳霞陆洪斌邓麦村张卫薛松周建男
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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