Two-step method and device for producing hydrogen through water electrolysis on basis of three-electrode system

A three-electrode system and electrolyzed water technology, which is applied in the field of electrolyzed water, can solve problems such as the effect is not very significant, and achieve the effect of reducing the cost of preparation

Active Publication Date: 2016-03-23
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although many new diaphragms have been researched an

Method used

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  • Two-step method and device for producing hydrogen through water electrolysis on basis of three-electrode system
  • Two-step method and device for producing hydrogen through water electrolysis on basis of three-electrode system

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Embodiment 1

[0038]In the three-electrode electrolyzer, platinum electrodes are used for electrolysis to generate hydrogen, iridium oxide is used for electrolysis to generate oxygen, and commercial nickel hydroxide electrodes are used for nickel hydroxide electrodes. The area of ​​the three electrodes is 20 square centimeters. The electrolytic solution uses 1 mol / liter of potassium hydroxide solution, and adopts 200 milliampere constant current to carry out electrolysis. Firstly, the cathode is connected to the platinum electrode, the anode is connected to the nickel hydroxide electrode, electrolyze with 200 mA current for 600 seconds, the average voltage is about 1.6V, and hydrogen gas is generated on the platinum electrode. Then the cathode is connected to nickel hydroxide, the anode is connected to the iridium oxide electrode, and the same 200 mA current is electrolyzed until the voltage rises to 1V, the time is 600 seconds, the average voltage is 0.5V, and oxygen is generated on the ir...

Embodiment 2

[0040] The catalytic electrode of the three-electrode electrolyzer to generate hydrogen by electrolysis uses a platinum electrode, the catalytic electrode for electrolysis of oxygen to generate oxygen uses a mixed electrode of CoO and carbon, and the nickel hydroxide electrode uses a commercial nickel hydroxide electrode that can be purchased in the market. The area of ​​the three electrodes is 20 square centimeters. The electrolytic solution uses a potassium hydroxide solution of 1 mole per liter, and electrolyzes with a constant current of 200 milliamperes. First, the cathode is connected to the platinum electrode, the anode is connected to the nickel hydroxide electrode, 200 mA constant current electrolysis, the electrolysis time is 600 seconds, the average voltage is about 1.6V, and hydrogen gas is generated on the platinum electrode. Then the cathode is connected to nickel hydroxide, and the anode is connected to the CoO and carbon composite electrode. The same 200 mA cur...

Embodiment 3

[0042] Single-layer MoS is used as the catalytic electrode for the electrolysis of hydrogen in a three-electrode electrolyzer 2 With the graphene composite electrode, the catalytic electrode for electrolytically generating oxygen uses iridium oxide, and the nickel hydroxide electrode uses a commercial nickel hydroxide electrode that can be purchased in the market. The area of ​​the three electrodes is 20 square centimeters. The electrolytic solution uses a potassium hydroxide solution of 1 mole per liter, and electrolyzes with a constant current of 200 milliamperes. First the cathode is connected to the MoS 2 / Graphene composite electrode, the anode is connected to the nickel hydroxide electrode, 200 mA constant current electrolysis, the electrolysis time is 600 seconds, the average voltage is about 1.65V, MoS 2 Hydrogen gas is generated on the graphene / graphene composite electrode. Then the cathode is connected to the nickel hydroxide electrode, and the anode is connected ...

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Abstract

The invention belongs to the technical field of water electrolysis, and particularly relates to a two-step method and device for producing hydrogen through water electrolysis on the basis of a three-electrode system. According to the device, an electrolytic bath comprises a hydrogen evolution catalysis electrode, an oxygen evolution catalysis electrode and a nickel hydroxide electrode. According to the method, water molecules are electrochemically reduced to hydrogen gas on the surface of the hydrogen evolution catalysis electrode, a Ni(OH)2 electrode is electrochemically oxidized to form a NiOOH electrode at the same time, and electrons flow to the hydrogen evolution catalysis electrode from the Ni(OH)2 electrode through an external circuit in the process; the NiOOH electrode is electrochemically reduced to the Ni(OH)2 electrode, hydroxyl ions are electrochemically oxidized to form oxygen gas on the surface of the oxygen evolution catalysis electrode, and the electrons flow to the NiOOH electrode from the oxygen evolution catalysis electrode through the external circuit in the process. According to the device and the method, the hydrogen production step and the oxygen production step which are synchronous in conventional water electrolysis are effectively separated, the high-purity hydrogen gas can be prepared without any diaphragms through the electrolysis device because the hydrogen production step and the oxygen production step are completely separated, and therefore the cost of producing the hydrogen through water electrolysis is lowered further.

Description

technical field [0001] The invention belongs to the technical field of electrolyzed water, and in particular relates to a novel method and device for producing hydrogen by electrolyzing water in two steps based on a three-electrode system. Background technique [0002] Energy is an important material basis for developing the national economy and improving people's quality of life, an important constraint that directly affects economic development, and one of the foundations for national strategic security. With the advent of the new century, human society will have more and more demands on the quantity and quality of energy, but due to endless exploitation and excavation, the energy resources that human beings rely on for survival are decreasing day by day, and as the main energy China's oil and coal reserves are also becoming increasingly depleted. At the same time, the traditional energy structure and a large amount of energy consumption have caused serious pollution to t...

Claims

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Application Information

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IPC IPC(8): C25B1/04C25B11/06
CPCC25B1/04C25B11/091C25B11/04Y02E60/36
Inventor 王永刚夏永姚陈龙
Owner FUDAN UNIV
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