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Anode for alkaline water electrolysis

an alkaline water, anode technology, applied in the field of anodes, can solve the problems of corrosiveness, ni anode performance degradation, and corrosiveness of concentration aqueous alkaline solution, and achieve the effects of improving electron conductivity of nickel oxide film, and reducing the surface area of nickel substra

Inactive Publication Date: 2016-08-18
NAT UNIV CORP YOKOHAMA NAT UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides an anode for alkaline water electrolysis that includes a lithium-containing nickel oxide catalytic layer with a specific molar ratio of lithium and nickel. The anode is suitable for use with large power fluctuations such as wind or solar power. The method involves applying a solution containing a lithium compound onto a conductive substrate made of nickel or a nickel-base alloy, heat-treating it in an oxygen atmosphere at high temperature, and maintaining the crystal structure and high-performance over a long-term use. The ratio of lithium to nickel and the heat treatment temperature control the surface area of the nickel substrate, resulting in a stabilized substrate and improved activity and durability of the electrode.

Problems solved by technology

As the temperature increases, a high-concentration aqueous alkaline solution has not only higher conductivity but also higher corrosiveness.
However, in alkaline water electrolysis that uses renewable energy as a power source, there have been problems such as degradation of Ni anode performance caused by severe conditions such as sudden operation stops and load variations (NPL 3).
In such a cell reaction, when a large cell is fabricated, leakage of electric current occurs through a shared pipe.
However, this requires special power control.
Furthermore, since oxygen and hydrogen are always generated, much effort is needed for maintenance.
However, this is not an appropriate process in the case where the electrolysis is assumed to be performed using electric power with large power fluctuations that is generated by using renewable energy.
Furthermore, it cannot be imagined at all what effects are provided by the catalytic layer of an electrode in an oxygen evolution anode used for alkaline water electrolysis that uses a high-concentration aqueous alkaline solution, in particular, under the application of electric power with large power fluctuations.

Method used

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  • Anode for alkaline water electrolysis
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  • Anode for alkaline water electrolysis

Examples

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example 1

[0075]A nickel plate subjected to mirror polishing (polishing with P8000 corresponding to a particle size of 1 μm) at room temperature was used as an electrode substrate. The nickel plate was immersed in 5 mass % lithium hydroxide for one hour, and baked in an air atmosphere at 1000° C. for one hour to produce a lithium-containing nickel oxide electrode. It was estimated from X-ray diffraction analysis in FIG. 3 that the produced lithium-containing nickel oxide electrode was mainly composed of Li0.208Ni1.792O2 and the molar ratio (Li / Ni) of lithium and nickel was 0.12 on average. It is clear from the X-ray diffraction analysis in FIG. 3 that the peaks estimated as Li0.208Ni1.792O2 are shown as sharp peaks before and after a cycle test.

[0076]An electrochemical measurement described below was conducted at 25±1° C. in a 25 mass % aqueous potassium hydroxide solution. In an electrochemical pretreatment, 100 cycles of cyclic voltammetry (CV) were performed at a potential of 0 to 1.5 Vvs....

example 2

[0078]A lithium-containing nickel oxide electrode was produced in the same manner as in Example 1, except that the oxidation treatment was performed in an air atmosphere at 900° C. for one hour. The molar ratio (Li / Ni) of lithium and nickel in the produced lithium-containing nickel oxide electrode was 0.14.

[0079]The same cycle test as in Example 1 was performed. The overvoltage at a current density of 100 mAcm−2 before the cycle test was 210 mV, and the overvoltage after the cycle test was 250 mV, which means that the overvoltage was substantially stable. In electron micrographs, a significant change in the crystalline state was not observed. Referring to the X-ray diffraction analysis before and after the cycle test, the same change as in Example 1 was observed.

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Abstract

An anode for alkaline water electrolysis includes a conductive substrate having at least a surface made of nickel or a nickel-base alloy and a lithium-containing nickel oxide catalytic layer formed on a surface of the substrate. The molar ratio (Li / Ni) of lithium and nickel in the catalytic layer is in the range of 0.005 to 0.15.

Description

TECHNICAL FIELD[0001]The present invention relates to an anode used in alkaline water electrolysis, and particularly to an oxygen evolution anode for alkaline water electrolysis that uses electric power with large power fluctuations.BACKGROUND ART[0002]Hydrogen is a secondary energy source that is suitable for storage and transport and has a low environmental load. Therefore, the spotlight is focused on a hydrogen energy system that uses hydrogen as an energy carrier. At present, hydrogen is mainly produced by, for example, steam reforming of fossil fuels, but the importance of alkaline water electrolysis that uses renewable energy as a power source has been increasing from the viewpoint of global warming and depletion of fossil fuels.[0003]Water electrolysis is broadly divided into alkaline water electrolysis in which a high-concentration aqueous alkaline solution is used as an electrolyte and solid polymer water electrolysis in which a solid polymer electrolyte (SPE) is used as an...

Claims

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Application Information

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IPC IPC(8): C25B11/04C25B1/04
CPCB01J23/78C25B1/04C25B11/0478Y02E70/10Y02P20/133C25B11/0405C25B11/0415C25B11/0431C25B11/0447Y02E60/366C25B11/061C25B11/057C25B11/075C25B11/051C25B11/091Y02E60/36C25B11/053
Inventor ICHIKAWA, HIROKIMITSUSHIMA, SHIGENORINAGASHIMA, IKUOSUNADA, YOSHIOKATO, AKIHIROYIN, LIANGMANABE, AKIYOSHINISHIKI, YOSHINON
Owner NAT UNIV CORP YOKOHAMA NAT UNIV
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