Equipment that can directly produce hydrogen by using salt difference and its application method

A salt difference energy and direct technology, applied in the direction of electrolysis components, electrolysis process, diaphragm, etc., can solve the problems of high energy consumption, harsh selection of metal electrodes, high energy consumption of hydrolysis, etc., to reduce energy consumption, improve electrode stability, and produce The effect of high hydrogen efficiency

Active Publication Date: 2019-05-17
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] If a conventional reverse electrodialysis device is used to generate electric energy as an energy source to drive a conventional electrolyzer to prepare hydrogen, there will be the following problems: (1) Both sets of devices need to have a pair of electrodes on both sides, and an electrochemical reaction occurs, Large energy consumption; (2) There is only one diaphragm between the cathode and the anode in the water electrolyzer, and the hydrogen and oxygen generated on the electrodes on both sides of the diaphragm will pass through the diaphragm to mix; (3) In the conventional water electrolyzer, the standard electrode Potential E 0 =1.229V, the energy consumption of hydrolysis is high, and the electrolyte is the same in the cathode chamber and the anode chamber, the selection of metal electrodes is very harsh

Method used

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  • Equipment that can directly produce hydrogen by using salt difference and its application method
  • Equipment that can directly produce hydrogen by using salt difference and its application method
  • Equipment that can directly produce hydrogen by using salt difference and its application method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] This example uses figure 1 The equipment shown in the figure can directly produce hydrogen by using the salt difference. The concentrated solution used is an aqueous sodium chloride solution with a concentration of 4.0mol / L, the light solution used is an aqueous sodium chloride solution with a concentration of 0.017mol / L, and the lye used is an aqueous sodium hydroxide solution with a concentration of 0.5mol / L , and the acid solution used is an aqueous hydrochloric acid solution with a concentration of 2.0 mol / L.

[0071] Construction basis figure 1 The equipment that can directly produce hydrogen by utilizing the salt difference shown in , in which 20 cation exchange membranes and 20 anion exchange membranes are used in total, and 19 concentrated solution chambers and 20 dilute solution chambers are formed in the reverse electrodialysis device combination unit. The anode and cathode plates used are ruthenium-coated titanium plates produced by Baoji Qixin Titanium In...

Embodiment 2

[0081] In a similar manner to Example 1 by figure 1 The equipment that can directly produce hydrogen by using the salt difference shown in , the difference is that the concentration of hydrochloric acid in the acid solution is changed to 1.0mol / L, and the concentration of sodium hydroxide in the lye is changed to 0.5 mol / L.

[0082] Measure the change of current and hydrogen production rate in the direct hydrogen production process of the salt difference, the results are shown in image 3 and Figure 4 ,in image 3 It is the current diagram in the direct hydrogen production process of the embodiments 1, 2, 3 and 4; Figure 4 It is the change diagram of hydrogen production rate in the process of direct hydrogen production by salt difference.

[0083] In this embodiment, the device can continuously generate current, and a stable hydrogen production rate of 1.89ml / min can be detected.

Embodiment 3

[0085] In a similar manner to Example 1 by figure 1 The equipment shown in that can directly produce hydrogen by using the salt difference, the difference is that the concentration of hydrochloric acid in the acid solution is changed to 0.5mol / L, and the concentration of sodium hydroxide in the lye is changed to Change to 0.5mol / L.

[0086] Measure the change of current and hydrogen production rate in the direct hydrogen production process of the salt difference, the results are shown in image 3 and Figure 4 ,in image 3 It is the current diagram in the direct hydrogen production process of the embodiments 1, 2, 3 and 4; Figure 4 It is the change diagram of hydrogen production rate in the process of direct hydrogen production by salt difference.

[0087] In this embodiment, the device can continuously generate current, and a stable hydrogen production rate of 1.79ml / min can be detected.

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Abstract

The invention provides a device capable of directly producing hydrogen by utilizing the salt difference and a use method thereof. Specifically, the equipment capable of directly producing hydrogen by utilizing the salt difference includes a reverse electrodialysis device, an anolyte storage tank, a catholyte storage tank, a concentrated solution storage tank and a dilute solution storage tank. According to the technical scheme of the present invention, under the condition of no external power supply, using the potential energy difference of salt solutions with different concentrations, the anode chamber and the cathode chamber on both sides of the reverse electrodialysis device respectively use alkaline electrolyte and acid electrolyte, directly in the reverse electrodialysis device. The hydrolysis half-reaction occurs on the electrode of the electrodialysis device to generate hydrogen and oxygen, and the gas is separated online by the gas-liquid separation system. The device and its use method can not only reduce the energy consumption of hydrogen production by hydrolysis and improve the stability of electrodes, but also have simple process, no need of external energy, no pollution, and high hydrogen production efficiency.

Description

technical field [0001] The invention belongs to the technical field of hydrogen energy, and specifically relates to a device for directly producing hydrogen through reverse electrodialysis by using the salt difference energy as a direct driving force and a method for using the same. Background technique [0002] With the development of the world economy, traditional fossil energy sources such as oil, natural gas, and coal are facing the plight of being exhausted, and the problems of global warming and air pollution caused by burning fossil energy sources are also becoming more and more serious. Research and development of new renewable energy sources is the solution An important tool for the energy and environmental crisis. Studies have proved that renewable energy such as wind energy, solar energy, tidal energy, salt difference energy and hydrogen energy can replace traditional fossil fuels. Hydrogen energy has no pollution to the environment due to its easy storage, high e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/10C25B13/02C25B9/08C25B9/00C25B9/19
CPCC25B9/00C25B13/02C25B1/04C25B9/73C25B9/19Y02E60/36
Inventor 徐铜文陈霞蒋晨啸王秋月
Owner UNIV OF SCI & TECH OF CHINA
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