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
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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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