A method and device for electrolyzing water to produce hydrogen

A technology for electrolysis of water and hydrogen, applied in electrolysis components, electrolysis process, electrodes, etc., can solve the problems of high power consumption and high hydrogen production cost, and achieve the effect of reducing hydrogen production cost, improving power utilization rate, and reducing energy consumption

Active Publication Date: 2018-10-30
安徽清氢能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem solved by the present invention is to overcome the defects of large power consumption and high hydrogen production cost in the existing hydrogen production process by electrolysis of water, and further provide a method and device for hydrogen production by electrolysis of water with low energy consumption and low cost

Method used

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  • A method and device for electrolyzing water to produce hydrogen
  • A method and device for electrolyzing water to produce hydrogen

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Effect test

Embodiment 1

[0040] The device for producing hydrogen by electrolysis of water described in this embodiment includes:

[0041] The electrolytic cell 1 is provided with a temperature regulation and control system; preferably, the temperature regulation and control system is a constant temperature water bath interlayer arranged outside the cell body of the electrolytic cell 1;

[0042]A bipolar membrane 2 composed of a cation exchange membrane 3 and an anion exchange membrane 4, the bipolar membrane 2 is arranged perpendicular to the inner bottom surface of the electrolytic cell 1 and is sealed and connected with the inner bottom surface, in this embodiment , the bipolar membrane is sealed by being clamped between rubber gaskets fixed on the inner wall of the electrolytic cell; the bipolar membrane 2 separates the electrolytic cell 1 into an anode chamber 5 and a cathode that are not connected to each other chamber 6, wherein said cation exchange membrane 3 is disposed towards said cathode c...

Embodiment 2

[0050] The method for electrolyzing water to produce hydrogen described in this embodiment includes:

[0051] Inject the sulfuric acid aqueous solution of 1mol / L into the cathode chamber in the device of embodiment 1, inject the sodium hydroxide aqueous solution of 2mol / L in the anode chamber simultaneously;

[0052] At room temperature of 20°C, apply a voltage of 0.8V between the anode and the cathode, so that the hydrogen ions in the sulfuric acid aqueous solution undergo a reduction reaction at the cathode to produce hydrogen gas, and at the same time, the hydroxide ions in the sodium hydroxide aqueous solution undergo an oxidation reaction and precipitate at the anode oxygen.

[0053] According to the method of the present embodiment, the power consumption for producing one standard cubic meter of hydrogen is 1.8KWh.

Embodiment 3

[0055] The method for electrolyzing water to produce hydrogen described in this embodiment includes:

[0056] Inject the sulfuric acid aqueous solution of 2mol / L into the cathode chamber in the device of embodiment 1, inject the potassium hydroxide aqueous solution of 7mol / L in the anode chamber simultaneously;

[0057] At 80°C, a voltage of 1.4V is applied between the anode and the cathode, so that the hydrogen ions in the sulfuric acid aqueous solution undergo a reduction reaction at the cathode to produce hydrogen gas, and at the same time, the hydroxide ions in the potassium hydroxide aqueous solution undergo an oxidation reaction at the anode to release oxygen .

[0058] According to the method of this embodiment, the power consumption for producing one standard cubic meter of hydrogen is 3.1 KWh.

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Abstract

The invention provides a hydrogen production method and device through electrolysis of water. The method comprises the following steps: under the action of direct current, an H<+> has a reduction reaction at a cathode to produce hydrogen and an OH<-> has an oxidation reaction at an anode to separate oxygen out simultaneously; the H<+> and the cathode are both located in a cathode chamber, the OH<-> and the anode are both located in an anode chamber, and the cathode chamber and the anode chamber are formed through separation by a bipolar membrane. According to the method, the bipolar membrane is adopted for the first time to separate an electrolytic cell into the anode chamber and the cathode chamber which are not communicated with each other, so that a hydrogen evolution reaction in an acid environment in the cathode chamber and an oxygen evolution reaction in an alkaline environment in the anode chamber can be performed synchronously, the voltage of the electrolytic cell is reduced, and energy consumption is reduced. Meanwhile, the acid and alkaline environments during electrolysis can be supplied continuously by a bipolar membrane water dissociation process, accordingly, acid and alkali are not consumed and pollutants are not produced when the method is adopted, and the industrial hydrogen production requirement can be met. The hydrogen production device through electrolysis of water has the advantages of simple structure and convenience in operation.

Description

technical field [0001] The invention relates to the technical field of hydrogen production, in particular to a method and a device for preparing hydrogen by using diaphragm electrolysis technology. Background technique [0002] As a common industrial raw material and special gas, hydrogen has been widely used in petrochemical industry, electronics industry, metallurgical industry, food processing, fine organic synthesis and other fields. In addition, because the calorific value per unit mass of hydrogen is the highest among all kinds of fuels when it is burned, it is more than three times the calorific value of petroleum fuels, and its combustion product is only water; at the same time, electrolysis of water can also produce hydrogen and oxygen, thus The recycling between water and hydrogen is realized, and no environmental pollution is produced during the cycle, making hydrogen gradually become an ideal secondary energy source, which has received more and more attention in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/10C25B13/02C25B11/08
CPCC25B1/04C25B13/02C25B9/73C25B11/051C25B11/057Y02E60/36
Inventor 王保国王培灿雷青芦琛璘洪为臣
Owner 安徽清氢能源科技有限公司
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