Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A method of electrochemical reduction-thermochemical cycle decomposition of water to produce hydrogen

A thermochemical cycle and electrochemical technology, applied in chemical instruments and methods, hydrogen production, inorganic chemistry, etc., can solve the problems of difficult matching of heat sources and high temperature, and achieve the effect of avoiding material problems, being easy to implement, and simplifying the process route.

Active Publication Date: 2022-03-22
GUANGDONG UNIV OF PETROCHEMICAL TECH
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to provide a method of electrochemical reduction-thermochemical cycle decomposition of water to produce hydrogen, which is used to solve the problem of metal oxide thermochemical cycle decomposition of water to produce hydrogen The temperature required by the method is high, and the heat source is difficult to match

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method of electrochemical reduction-thermochemical cycle decomposition of water to produce hydrogen
  • A method of electrochemical reduction-thermochemical cycle decomposition of water to produce hydrogen
  • A method of electrochemical reduction-thermochemical cycle decomposition of water to produce hydrogen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: Electrochemical reduction generates iron.

[0029] Step 1: Weigh 23.55g of 56.5mol% Li 0.87 Na 0.63 K 0.50 CO 3 – 43.5mol% LiOH mixture, and then weighed 1.87 g of Fe 2 o 3 Grind and mix well, use a nickel sheet as the anode (1 cm × 3 cm), and a 304 stainless steel sheet (1 cm × 3 cm) as the cathode, fix the anode and cathode, and put the ground and mixed electrolyte into a corundum crucible.

[0030] Step 2: Put the corundum crucible into an electric furnace to heat up to 500°C, and connect the anode and cathode to a DC power supply.

[0031] Step 3: Turn on the power supply and perform constant current electrolysis at 0.5 A for 240 min.

[0032] Step 4: After the electrolysis, cut off the power supply, take out the cathode, and use XRD to analyze the electrolysis product on the electrolyte and the cathode. The results are shown in figure 1 ,Depend on figure 1 It can be seen that iron is generated on the cathode after electrolysis.

Embodiment 2

[0034] Step 1 and Step 2 of this embodiment are the same as Step 1 and Step 2 in Embodiment 1.

[0035] Step 3: Turn on the power, and electrolyze for 5, 10, 20, 40 and 60 min at a constant current of 0.5 A, respectively.

[0036] Step 4: Cut off the power supply after the electrolysis, and then use the N with a flow rate of 80 mL / min 2 Water vapor at 250°C was carried and blown to the stainless steel sheet cathode to react with the new ecological Fe formed by electrolysis for 120 min.

[0037] Step 5: The gas discharged from the electrolytic cell is collected by the drainage and gas collection method, and the hydrogen content is analyzed by gas chromatography. see results figure 2 , it can be seen from the figure that as the electrolysis time increases, the amount of hydrogen produced increases, and the current efficiencies at 5, 10, 20, 40 and 60 min are 13.3%, 28.9%, 21.5%, 23.1% and 27.1% respectively .

Embodiment 3

[0039] Step 1 and Step 2 of this embodiment are the same as Step 1 and Step 2 in Embodiment 1.

[0040] Step 3: Turn on the power supply, and electrolyze for 60 min at a constant current of 0.5 A.

[0041] Step 4 of this embodiment is the same as step 4 in specific embodiment 2.

[0042] Step 5: The gas discharged from the electrolytic cell is collected by the drainage and gas collection method, and the hydrogen content is analyzed by gas chromatography.

[0043] Step 6: Recycle back to Step 1 of this embodiment to carry out the next electrochemical reduction process - thermochemical water splitting process to produce hydrogen. see results image 3 , it can be seen from the figure that the hydrogen production and current efficiency of the electrochemical reduction process-thermochemical water splitting process for hydrogen production are basically constant for 4 cycles, indicating that the electrochemical reduction process-thermochemical water splitting process for hydrogen pr...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The present invention relates to a method of electrochemical reduction-thermochemical cycle decomposing water to produce hydrogen. The electrochemical reduction process is first carried out, and then the process of thermochemically decomposing water to produce hydrogen is carried out; the electrochemical reduction process uses a cathode and an anode in a molten salt Iron oxides are electrolyzed in the electrolyte to form new ecological Fe, the amount of iron oxides added is 0.25-1.0 mol / kg electrolyte, the electrolysis temperature is 450-600°C, the electrolysis current is 0.25-1.0 A, and the electrolysis time is 10- 60 min; the thermochemical water splitting hydrogen production process is completed after the electrochemical reduction process, and after the power is cut off, the steam generator feeds water while delivering water vapor, and the water vapor is fed into the cathode in the electrolytic cell, Carry out the hydrogen production reaction of water splitting; the water input rate is 0.1‑1.0 mL / min. The present invention decomposes water to produce hydrogen at 500°C, avoiding material problems at high temperatures.

Description

technical field [0001] The invention relates to a method for preparing hydrogen, in particular to an electrochemical reduction-thermochemical cycle decomposition method for hydrogen production. Background technique [0002] As a clean and efficient secondary energy carrier, hydrogen energy has the characteristics of rich sources, light weight, high calorific value, green environmental protection, and various utilization forms and storage methods. It can not only meet the current low-carbon development needs, but also be play an important role in the future energy landscape. Using solar energy to split water to produce hydrogen is the dream of human beings, but H 2 O is a very stable compound. Studies have shown that when the temperature is above 2250°C, the direct thermal decomposition of water to produce hydrogen is more obvious. Since the temperature required for direct decomposition of water is too high, and at high temperatures, it is difficult to separate hydrogen an...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C01B3/04C25C3/34
CPCC25C3/34C01B3/045Y02E60/36
Inventor 崔宝臣刘淑芝张佳宁刘先军陈辉张帮亮
Owner GUANGDONG UNIV OF PETROCHEMICAL TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com