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Method and device for producing hydrogen through water electrolysis

A technology for electrolyzing water and electrolyte, applied in electrolysis process, electrolysis components, cells, etc., can solve problems such as increased energy consumption, achieve the effect of reducing energy consumption and improving electrolysis efficiency

Inactive Publication Date: 2020-02-14
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the problem of increased energy consumption caused by the concentration difference potential in the existing SPE electrolyzed water hydrogen production technology, and to provide a method and device for electrolyzing water to produce hydrogen by utilizing the pH difference between the electrolyte solution on the cathode side and the anode side

Method used

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  • Method and device for producing hydrogen through water electrolysis

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Embodiment 1

[0052] The electrolyte on the cathode side is water at 80°C, the electrolyte on the anode side is 30% by weight KOH solution at 80°C, the absolute value of the pH difference between the electrolyte on the cathode side and the electrolyte on the anode side is 8, and the ion exchange membrane uses Nafion117 membrane (purchased from DuPont (DuPont Company), the same below), the cathode catalyst and the anode catalyst are both Pt, apply a 2.2V DC voltage, and generate H under the action of the cathode side electrolyte cathode catalyst 2 , the anode side electrolyte produces O under the action of the anode catalyst 2 , energy consumption is 4.0kWh / Nm 3 .

Embodiment 2

[0054] The cathode side electrolyte is 20 wt% H at 80°C 2 SO 4 solution, the electrolyte on the anode side is water at 80°C, the absolute value of the pH difference between the electrolyte on the cathode side and the electrolyte on the anode side is 5, the ion exchange membrane is Nafion117 membrane, the cathode catalyst and the anode catalyst are both Pt, and 2.2 V DC voltage, so that the electrolyte on the cathode side generates H under the action of the cathode catalyst 2 , the anode side electrolyte produces O under the action of the anode catalyst 2 , energy consumption is 3.9kWh / Nm 3 .

Embodiment 3

[0056] The electrolyte on the cathode side is water at 50°C, the electrolyte on the anode side is 30% by weight KOH solution at 50°C, the absolute value of the pH difference between the electrolyte on the cathode side and the electrolyte on the anode side is 7.8, and the ion exchange membrane adopts X37-50 anion exchange membrane (purchased from Dioxide Materials (carbon dioxide material company)), the cathode catalyst and the anode catalyst are both Ni, and a 2.2V DC voltage is applied to make the cathode side electrolyte generate H under the action of the cathode catalyst. 2 , the anode side electrolyte produces O under the action of the anode catalyst 2 , energy consumption is 4.9kWh / Nm 3 .

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Abstract

The invention relates to the field of hydrogen production through water electrolysis, and discloses a method and a device for producing hydrogen through water electrolysis. The method comprises: underthe action of direct current, carrying out a reduction reaction on a cathode side to produce hydrogen, and carrying out oxidation reaction on an anode side to produce oxygen, wherein the electrolyticsolution on the cathode side and the electrolytic solution on the anode side have pH difference, the cathode side and the anode side are isolated by an electrode assembly, and the electrode assemblyis an ion exchange membrane with two side surfaces respectively coated with an anode catalyst and a cathode catalyst. According to the invention, the ion exchange membrane can selectively permeate anions or cations, and the pH difference between the electrolytic solutions on the cathode side and the electrolyte on the anode side can accelerate the ion conduction rate, so that the electrolysis efficiency is improved, and the energy consumption is reduced.

Description

technical field [0001] The invention relates to the field of hydrogen production by electrolysis of water, in particular to a method and device for production of hydrogen by electrolysis of water. Background technique [0002] In recent years, problems such as global warming, environmental pollution, and reduction of underground resources have become increasingly serious, and renewable energy at home and abroad has been vigorously developed. However, renewable energy is geographically unbalanced, and its output fluctuates greatly, and there is a limit to the transmission of electricity generated by natural energy to the general power system. In addition, the difference in weather and seasons will lead to fluctuations in the amount of electricity generated. Substantial changes. Therefore, hydrogen production by electrolysis of water has become a means of new energy storage and peak regulation. With the development of hydrogen energy, electrolysis of water to produce hydroge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/10C25B9/10C25B9/23
CPCC25B1/04C25B9/73C25B9/23Y02E60/36
Inventor 郭秀盈许壮何广利李先明缪平
Owner CHNA ENERGY INVESTMENT CORP LTD
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