Device and method for producing hydrogen through step-by-step water electrolysis based on all-vanadium liquid flow redox medium

An all-vanadium liquid flow, electrolyzed water technology, applied in the field of electrolyzed water, can solve problems such as difficulty in large-scale regulation of gas production volume, and achieve the effects of reducing electrolysis voltage and regulating hydrogen production

Inactive Publication Date: 2021-09-21
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the mediators of these two methods are solid electrodes, and

Method used

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  • Device and method for producing hydrogen through step-by-step water electrolysis based on all-vanadium liquid flow redox medium
  • Device and method for producing hydrogen through step-by-step water electrolysis based on all-vanadium liquid flow redox medium
  • Device and method for producing hydrogen through step-by-step water electrolysis based on all-vanadium liquid flow redox medium

Examples

Experimental program
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Effect test

Embodiment 1

[0062] The cathode of tank 1 is connected to the storage tank to place 10 ml of electrolytically prepared 1 mol / L V 3+ 3 mol / L H 2 SO 4 , the anode connection storage tank is placed in 10 ml containing 1 mol / L VO 2+ 3 mol / L H 2 SO 4 , the cathode and anode electrodes are all graphite felts treated at 400°C for 24 hours in air. The catalytic electrode for the electrolysis of the anode of tank 2 to generate oxygen adopts an iridium dioxide / carbon composite electrode, and the anode is connected to the storage tank to place 10 milliliters of 3 mol / liter H 2 SO 4 , the cathode electrode is graphite felt treated at 400°C for 24 hours in air. The hydrogen evolution unit adopts the diaphragm electrolysis cell 3, and the catalytic electrode of the cathode electrolysis of the cell 3 to generate hydrogen adopts a platinum mesh electrode, and the cathode is connected to the storage tank to place 10 ml of 3 mol / L H 2 SO 4 , the cathode electrode is graphite felt treated at 400°C fo...

Embodiment 2

[0064] The cathode of tank 1 is connected to the storage tank to place 10 ml of electrolytically prepared 1 mol / L V 3+ 3 mol / L H 2 SO 4 , the anode connection storage tank is placed in 10 ml containing 1 mol / L VO 2+ 3 mol / L H 2 SO 4 , the cathode and anode electrodes are all graphite felts treated at 400°C for 24 hours in air. A ruthenium dioxide / carbon composite electrode is used as the catalytic electrode for the electrolysis of the anode of tank 2 to generate oxygen, and the anode is connected to the storage tank to place 10 milliliters of 3 mol / liter H 2 SO 4 , the cathode electrode is graphite felt treated at 400°C for 24 hours in air. The hydrogen evolution unit adopts the diaphragm electrolysis cell 3, and the catalytic electrode of the cathode electrolysis of the cell 3 to generate hydrogen adopts a platinum-carbon composite electrode, and the cathode is connected to the storage tank to place 10 ml of 3 mol / L H 2 SO 4 , the cathode electrode is graphite felt tr...

Embodiment 3

[0066] The cathode of tank 1 is connected to the storage tank to place 10 ml of electrolytically prepared 1 mol / L V 3+ 3 mol / L H 2 SO 4 , the anode connection storage tank is placed in 10 ml containing 1 mol / L VO 2+ 3 mol / L H 2 SO 4 , the cathode and anode electrodes are all graphite felts treated at 400°C for 24 hours in air. A ruthenium dioxide / carbon composite electrode is used as the catalytic electrode for the electrolysis of the anode of tank 2 to generate oxygen, and the anode is connected to the storage tank to place 10 milliliters of 3 mol / liter H 2 SO 4 , the cathode electrode is graphite felt treated at 400°C for 24 hours in air. The hydrogen evolution unit adopts a chemical catalytic solid-liquid reaction tank, and the catalyst uses molybdenum carbide particles. The area of ​​all electrodes is 10 square centimeters, and the diaphragm is selected from 10 square centimeters of Nafion117 film, and a constant current electrolysis is carried out by using a curren...

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Abstract

The invention belongs to the technical field of water electrolysis, and relates to a device and method for producing hydrogen through step-by-step water electrolysis based on an all-vanadium liquid flow redox medium The device comprises two diaphragm electrolytic cells (a cell 1 and a cell 2), a hydrogen evolution unit and an acidic all-vanadium electrolyte. According to the method, the water electrolysis is divided into two steps, charging an all-vanadium redox flow battery and producing hydrogen and oxygen. According to the first step, VO < 2 + > in an anode chamber in a tank 1 is oxidized into VO < 2 + >, and the VO 2 <+> is introduced into a tank 2; and V < 3 + > in a cathode chamber in the tank 1 is reduced into V < 2 + >, and meanwhile, the V < 2 + > is introduced into the hydrogen evolution unit. According to the second 2, in a tank 2, VO 2 <+> in the cathode chamber is reduced into VO < 2 + > and the VO < 2 + > is circulated back to the tank 1, and meanwhile, the anode generates oxygen; and V < 2 + > is oxidized into V < 3 + > in the hydrogen evolution unit and the V < 3 + > is circulated back to the tank 1, and hydrogen is generated at the same time. According to the method of the invention, hydrogen and oxygen can be separated out in different spaces and time, so that high-purity hydrogen is prepared; meanwhile, the electrolysis voltage is reduced, and the hydrogen production volume can be adjusted by controlling the amount of the electrolyte.

Description

technical field [0001] The invention belongs to the technical field of electrolyzed water, and in particular relates to a device and method for stepwise electrolyzing water to produce hydrogen based on an all-vanadium liquid flow redox medium. Background technique [0002] With the continuous progress of science and technology, the continuous development of national economy and military, and the continuous improvement of people's living standards, people's demand for energy is getting higher and higher. Coal, oil and natural gas are the main energy sources at present, but these fossil energy reserves are limited, and the mining, development and use process will cause a lot of pollution and carbon emissions. In order to solve the contradiction between energy shortage and economic development and environmental protection, it is necessary to develop clean energy sources that are widely sourced, renewable, low-carbon and pollution-free. This will also help my country achieve th...

Claims

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Application Information

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IPC IPC(8): C25B9/70C25B1/04H01M8/0656H01M8/18
CPCC25B9/70C25B1/04H01M8/0656H01M8/188Y02E60/36Y02E60/50
Inventor 王永刚孔涛逸
Owner FUDAN UNIV
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