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Method and device for hydrogen production by electrochemical decomposition of hi in sulfur-iodine cycle hydrogen production

An electrochemical, sulfur-iodine technology, applied in the direction of electrolysis components, electrolysis process, diaphragm, etc., can solve the problems of complex process, high equipment requirements, large energy consumption, etc., to achieve mild conditions, low equipment requirements, simplified process and equipment Effect

Active Publication Date: 2019-04-23
ZHEJIANG UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0012] The technical problem to be solved by the present invention is to overcome the problems of high energy consumption, complicated process and high requirements on equipment in the HI module process of the sulfur-iodine circulation system in the prior art, and to provide a method for electrochemical hydrogen production in the sulfur-iodine circulation system. Method and device for decomposing HI to produce hydrogen

Method used

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  • Method and device for hydrogen production by electrochemical decomposition of hi in sulfur-iodine cycle hydrogen production
  • Method and device for hydrogen production by electrochemical decomposition of hi in sulfur-iodine cycle hydrogen production
  • Method and device for hydrogen production by electrochemical decomposition of hi in sulfur-iodine cycle hydrogen production

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specific Embodiment 1

[0060] Two 10cm×10cm graphite electrodes with a thickness of 1cm were used as the cathode and anode electrodes respectively, and the N115 proton exchange membrane of 5.5cm×5.5cm (effective area 5cm×5cm) separated the cathode and yang graphite electrodes. Use a high temperature circulator and a water circulation system to control the temperature of the anode and cathode liquid storage tanks.

[0061] The operating temperature is respectively 30°C, 45°C, 60°C, and 75°C, and the molar concentration ratio is HI:I 2 :H 2 The HIx solution of O=1:1.2:6.17 was pumped into the anode of the single cell as the anolyte. The deionized water in the cathode storage tank is pumped into the cathode of the single cell. The temperature of the positive and negative electrodes of the electrolytic cell is controlled by the heating plate of the single cell and the temperature controller. Turn on the online hydrogen analyzer, and at the same time feed high-purity argon with a certain mass flow rat...

specific Embodiment 2

[0067] Two 10cm×10cm graphite electrodes with a thickness of 1cm were used as the cathode and anode electrodes respectively, and the N117 proton exchange membrane of 5.5cm×5.5cm (effective area 5cm×5cm) separated the cathode and yang graphite electrodes. When the operating temperature is 60°C, the molar concentration ratio is HI:I 2 :H 2 The HIx solution of O=1:0.6:6.17, 1:0.8:6.17, 1:1:6.17 and 1:1.2:6.17 is used as the anolyte to stabilize the current density at 100mA / cm 2 , the experimental results are as Figure 5 shown.

[0068] At 60°C, the current density is 100mA / cm 2 , the initial HI concentration is 9mol / kg H2O , with the initial iodine concentration from 5.4mol / kg H2O rise to 10.8mol / kg H2O , the current efficiency dropped from 92.36% to 91.30%, but it was basically in the range of 89-94%, and the energy consumption per mole of hydrogen production was from 648.58kJ / mol H2 rose to 787.85kJ / mol H2 . This shows that I 2 The higher the concentration is, the mo...

specific Embodiment 3

[0069] Referring to Example 1, a device for electrochemically decomposing HI to produce hydrogen was built, and the HIx phase solution was injected into the anode side of the single cell, and deionized water was injected into the cathode side of the single cell. The concentration of HI in the control solution is 6mol / kgH 2 O, the iodine element concentration is 7.2mol / kgH 2 O.

[0070] The decomposition reaction is carried out by electrification, and the current density in the single cell is controlled to be constant at 100mA / cm 2 , the operating reaction conditions are normal pressure, and the operating temperatures are 30°C, 45°C, 60°C, and 75°C respectively; the electrolysis voltage of the single cell is measured every two minutes; after the decomposition reaction, the HIx phase solution on the anode side is circulated back to the In the Bunsen reactor, the deionized water mixed with hydrogen on the cathode side is recycled back to the cathode liquid storage tank. Experi...

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Abstract

The invention relates to the technology of sulphur and iodine circulation hydrogen production, and particularly provides a hydrogen production method adopting electrochemistry to disintegrate HI in sulphur and iodine circulation hydrogen production and a device. The method includes the steps that a monocell is used as a reactor, the monocell has anode graphite electrode and cathode graphite electrode, and a proton exchange membrane is used as a diaphragm; HIx homogeneous solution in the sulphur and iodine circulation hydrogen production system is injected into the anode side, and deionized water is injected into the cathode side; power supply is turned on to carry out decomposition reaction, I- of the anode side HIx homogeneous solution is oxidized to I2, and generated H+ passes through proton exchange membrane to reach the cathode side and is reduced to hydrogen; HIx homogeneous solution of the anode side enters a Bunsen reactor to be Bunsen reaction raw material in a circulating modeafter electrolytic reaction, and hydrogen generated from cathode side is sent out. According to the hydrogen production method adopting electrochemistry to disintegrate HI in sulphur and iodine circulation hydrogen production, an HIx solution is directly decomposed adopting electrochemistry method, the original process of concentration and distillation is omitted, and the process and the device are greatly simplified. Hydrogen is generated from cathode, and the separation problem with HI gas does not need to be considered.

Description

technical field [0001] The invention relates to the technical field of sulfur-iodine cycle hydrogen production, in particular to a method and device for hydrogen production by electrochemically decomposing HI in the sulfur-iodine cycle hydrogen production. Background technique [0002] As a clean, safe and sustainable alternative energy source, hydrogen energy has attracted more and more attention. Many countries have introduced hydrogen energy economic routes and planning policies. Large-scale low-cost hydrogen production is the basis of the future hydrogen energy economy, among which thermochemical cycle hydrogen production has more development prospects. In the field of thermochemical hydrogen production, thermochemical sulfur-iodide cycle hydrogen production is considered to be an ideal cycle for large-scale hydrogen production. The thermochemical sulfur-iodine circulating water splitting hydrogen production mainly includes the following three reaction processes: [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/10C25B1/24C25B13/02C25B9/00C25B15/02
CPCC25B1/04C25B1/24C25B9/00C25B13/02C25B15/02C25B9/73Y02E60/36
Inventor 王智化何勇张彦威岑可法周志军杨卫娟刘建忠黄镇宇
Owner ZHEJIANG UNIV
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