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Positive electrode for alkaline water electrolysis

A technology of water electrolysis and alkalinity, applied in the direction of electrodes, electrolysis components, electrolysis process, etc., can solve the problems of undisclosed stability, undisclosed manufacturing conditions of lithium content ratio, etc., and achieve the effect of maintaining corrosion resistance

Inactive Publication Date: 2016-06-15
NAT UNIV CORP YOKOHAMA NAT UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] However, Patent Documents 1 to 3 do not disclose the content ratio of lithium to nickel and its production conditions, nor do they disclose stability under electric power with severe power fluctuations.
[0018] It is disclosed that in the electrolysis of common salt, in order to prevent the cathode of generating hydrogen in the alkaline aqueous solution from deteriorating the nickel matrix due to the oxidation reaction under reverse current conditions, a nickel oxide is formed between the cathode catalyst containing noble metals and noble metal oxides and the nickel matrix. However, in Patent Documents 4 and 5, in order to form an intermediate layer mainly composed of nickel oxide, the substrate is heated at a relatively low temperature of 350°C to 550°C. After firing, such an intermediate layer is used for the stabilization of the catalyst layer and cannot be used as the catalyst layer of the electrode, not to mention the anode for generating oxygen used in the electrolysis of alkaline water using a high-concentration alkaline aqueous solution, especially in It is unimaginable what kind of effect will be brought by the catalyst layer as the electrode under the effect of electric power with sharp power fluctuations

Method used

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  • Positive electrode for alkaline water electrolysis
  • Positive electrode for alkaline water electrolysis
  • Positive electrode for alkaline water electrolysis

Examples

Experimental program
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Effect test

Embodiment 1

[0079] As the electrode substrate, a mirror-polished (P8000, 1-micron particle size) nickel plate at room temperature was used, immersed in 5 mass % lithium hydroxide for 1 hour, and calcined in an air atmosphere of 1000° C. for 1 hour to prepare a lithium oxide electrode with nickel oxide. As the electrode of the obtained lithium nickel oxide from image 3 X-ray presumption of , Li 0.208 Ni 1.792 O 2 As the main component, the molar ratio of lithium to nickel (Li / Ni) was 0.12 on average. from image 3 It can be seen from the X-ray diffraction analysis of 0.208 Ni 1.792 O 2 The peaks are shown as sharp peaks.

[0080] The temperature of the following electrochemical measurement was set to 25±1° C., and it was measured in a 25 mass % potassium hydroxide aqueous solution. As an electrochemical pretreatment, in the potential range: 0 ~ 1.5Vvs.RHE, scanning speed 100mVs -1 Cyclic Voltammetry (CV) was performed for 100 cycles. Cycle test at potential 1.0~1.8Vvs.RHE, scan...

Embodiment 2

[0083] An electrode having a lithium oxide and a nickel oxide was produced in the same manner as in Example 1, except that it was fired in an air atmosphere at 900° C. for 1 hour as an oxidation treatment. The molar ratio of lithium to nickel (Li / Ni) of the obtained lithium nickel oxide electrode was 0.14.

[0084] When performing the same cycle test, 100mAcm -2 The overpotential at the initial stage is 210mV, and the overpotential after the cycle test is 250mV, which is basically stable. No large crystal state change was recognized in the electron microscope photographs. In the X-ray diffraction analysis of the electrodes before and after the cycle test, the same changes as in Example 1 were confirmed.

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Abstract

The purpose of the present invention is to provide a positive electrode for alkaline water electrolysis, capable of producing hydrogen by using water electrolysis using power having high output fluctuation, such as renewable energy, said positive electrode having high durability against output fluctuation. The positive electrode for alkaline water electrolysis comprises: a conductive base body containing nickel or a nickel-base alloy on at least the surface thereof; and a lithium-containing nickel oxide catalyst layer formed on the base body surface. The positive electrode for alkaline water electrolysis is characterized by the molar ratio (Li / Ni) between the lithium and nickel in the catalyst layer being within the range of 0.005-0.15.

Description

technical field [0001] The present invention relates to an anode used in alkaline water electrolysis, and more particularly to an oxygen-generating anode used in alkaline water electrolysis with large power fluctuations. Background technique [0002] Hydrogen is a secondary energy suitable for storage and transportation and has a small burden on the environment. Therefore, a hydrogen energy system using hydrogen as an energy carrier has gradually attracted attention. Currently, hydrogen is mainly produced by steam reforming of fossil fuels. From the viewpoint of global warming and depletion of fossil fuels, the importance of alkaline water electrolysis using renewable energy as a power source is increasing. [0003] There are roughly two types of water electrolysis, and one type is alkaline water electrolysis, which uses a high-concentration alkaline aqueous solution as an electrolyte. The other is solid polymer water electrolysis, which uses a solid polymer membrane (SPE) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/06B01J23/78C25B1/04
CPCB01J23/78C25B1/04C25B11/061C25B11/057C25B11/075C25B11/051C25B11/091Y02P20/133Y02E60/36C25B11/053
Inventor 市川裕纪光岛重徳永岛郁男砂田良雄加藤昭博殷良真锅明義锦善则
Owner NAT UNIV CORP YOKOHAMA NAT UNIV
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