Method and device for preparing hydrogen by electrolyzing ammonia

A technology for ammonia preparation and electrolysis of ammonia, applied in the direction of electrolysis process, electrolysis components, electrodes, etc., to achieve the effect of low energy consumption, low energy consumption and easy availability of raw materials

Inactive Publication Date: 2015-03-18
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the shortcomings of hydrogen storage and safe use have become a serious obstacle to its application in automotive fuels.

Method used

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  • Method and device for preparing hydrogen by electrolyzing ammonia

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation of cathode and anode:

[0031] Dip the clean foam nickel electrode into the solution containing 5mmol / L H 2 PtCl 6 In the 0.5mol / L HCl solution, use the i-t curve method to deposit Pt at -0.3V, and the deposition time is 600s-3600s, that is, 0.5mg / cm 2 -2mg / cm 2 Platinum deposited amount of nickel foam cathode electrode.

[0032] Dip the clean nickel foam electrode into the 2 PtCl 6 and IrCl 3 In the 0.5mol / L HCl solution, where the mass ratio of Pt to Ir is 7:1, use the i-t curve method to deposit Pt at -0.3V, and the deposition time is 600s-3600s, that is, 0.5mg / cm 2 -2mg / cm 2 Nickel foam anode electrode deposited by double noble metal Pt / Ir.

[0033] Special device for the method of electrolyzing ammonia to produce hydrogen:

[0034] Such as figure 1 As shown, the special device is an H-type electrolytic cell. The horizontal side of the H-type electrolytic cell is provided with a glass sand disc, and the two vertical sides are respectively indep...

Embodiment 2

[0036] Hydrogen production by electrolysis of ammonia: Put 100mL of electrolyte solution composed of 2mol / L ammonia water, 5mol / L potassium hydroxide and water into the H-type electrolytic cell.

[0037] The electrolytic cell is divided into an anode chamber and a cathode chamber with a glass sand disc, wherein the anode electrode and the cathode electrode prepared by the above-mentioned embodiment are placed respectively; between the anode electrode and the cathode electrode, 2.5mA / cm 2The current, the obtained electrolysis voltage is about 0.6V, and the electrolysis voltage remains stable within 40000s. The hydrogen production rate is about 0.09mL / min.

Embodiment 3

[0039] Hydrogen production by electrolysis of ammonia: Put 100mL of electrolyte solution composed of 2mol / L ammonia water, 5mol / L potassium hydroxide and water into the H-type electrolytic cell.

[0040] The electrolytic cell is divided into an anode chamber and a cathode chamber with a glass sand disc, wherein an anode electrode and a cathode electrode are placed respectively; a 5mA / cm 2 The current, the obtained electrolysis voltage is about 0.68V, and the electrolysis voltage remains stable within 30000s. The hydrogen production rate is about 0.2mL / min.

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Abstract

The invention belongs to a preparation method of hydrogen and specifically relates to a method and a device for preparing the hydrogen by electrolyzing ammonia. Ammonia is taken as a raw material and foamed nickel on which different noble metals are deposited is taken as an anode and a cathode for an electrolytic hydrogen production reaction; specifically, the cathode and the anode are simultaneously inserted into an ammonia-containing electrolyte, and the external voltage of 0.6-0.8V is applied between the cathode and the anode so that ammonia has an oxidizing reaction to generate nitrogen and water has a reduction reaction to generate hydrogen. The temperature of the electrolytic reaction is controlled between 50 and 60 DEG C. The method for preparing hydrogen by electrolyzing ammonia has the advantages that the electrolytic voltage can be controlled below 0.8V and hydrogen can be prepared economically and effectively.

Description

technical field [0001] The invention belongs to a method for preparing hydrogen, and in particular relates to a method and a device for preparing hydrogen by electrolyzing ammonia. Background technique [0002] Hydrogen is ideally the cleanest energy. However, the disadvantages of hydrogen storage and safe use have become a serious obstacle to its application as a vehicle fuel. What urgently needs to be developed at present is to find a convenient, cheap and safe hydrogen storage system, and to find an energy carrier with high hydrogen storage density to indirectly realize the application of hydrogen energy. Ammonia is a good hydrogen storage carrier, which can better overcome the shortcomings of hydrogen in storage, transportation and safety. Ammonia is the most suitable renewable fuel for production other than hydrogen. It is synthesized from hydrogen in water and nitrogen in air, and is reduced to water and air during oxidative combustion. As an alternative fuel, ammoni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/02C25B9/06C25B11/03C25B11/08C25B9/17
CPCC25B1/02C25B9/17C25B11/031C25B11/057C25B11/097
Inventor 赵学波蒋敏朱丹丹
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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