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

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...

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Problems solved by technology

Although many new diaphragms have been researched and explored, the effect is still not very significant

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