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Electrochemical reduction-thermochemical cycle water-splitting hydrogen production method

A thermochemical cycle and electrochemical technology, applied in chemical instruments and methods, inorganic chemistry, hydrogen production, etc., can solve problems such as high temperature and difficult matching of heat sources, and achieve easy implementation, avoid material problems, eliminate heat loss and time wasting effect

Active Publication Date: 2019-03-26
GUANGDONG UNIV OF PETROCHEMICAL TECH
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  • 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

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  • Electrochemical reduction-thermochemical cycle water-splitting hydrogen production method
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  • Electrochemical reduction-thermochemical cycle water-splitting hydrogen production method

Examples

Experimental program
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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, 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 productio...

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Abstract

The invention relates to an electrochemical reduction-thermochemical cycle water-splitting hydrogen production method. Firstly, an electrochemical reduction process is conducted, and then a thermochemical water-splitting hydrogen production process is conducted; in the electrochemical reduction process, a cathode and an anode are adopted for ferric oxide electrolysis in a molten salt electrolyte,through electrolysis, nascent state Fe is generated, the adding amount of ferric oxide is 0.25-1.0 mol / electrolyte kg, electrolysis temperature is 450-600 DEG C, electrolysis current is 0.25-1.0 A, and electrolysis time is 10-60 min; according to the thermochemical water-splitting hydrogen production process, after the electrochemical reduction process is completed and a power supply is cut off, water is introduced into a vapour generator while the vapour generator discharges vapour, and the vapour is introduced to the cathode in an electrolytic tank for water-splitting hydrogen production reaction; the water input is 0.1-1.0 mL / min. According to the electrochemical reduction-thermochemical cycle water-splitting hydrogen production method, water-splitting hydrogen production is conducted at 500 DEG C, so that the problem of a material at high temperature is solved.

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

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Application Information

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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
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