Ruthenic acid nano sheet and its mfg. method
A technology of nano-sheets and manufacturing methods, which is applied in the field of ruthenium acid compounds, can solve the problems of insufficient electrodes, electrodes without strength, etc., and achieve high output effects
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Embodiment 1
[0106] "Process (a)"
[0107] 1. Synthesis of potassium-type layered ruthenate
[0108] Potassium-type layered ruthenic acid is synthesized according to the following solid-phase method or melting method.
[0109] (1) Synthesis by solid-phase method
[0110] K 2 CO 3 and RuO 2 They were mixed at a molar ratio of 0.625:1, and the resulting mixture was heated and calcined at 850° C. for 12 hours under the condition of feeding Ar gas. Next, the obtained calcined product was washed with distilled water to remove excess potassium. Finally, filtration or centrifugation is performed, and the solid content is recovered from the washed calcined product.
[0111] Here, K 2 CO 3 For RuO 2 The molar ratio of is preferably 0.2 to 1.5, more preferably 0.5 to 0.7. In addition, the calcination can also be performed in the air, but it is preferably performed in an inert atmosphere such as Ar gas. In addition, the calcination temperature is preferably 700 to 900°C.
[0112] (2) Manu...
Embodiment 2
[0203] In the present embodiment, the proton-type lamellar ruthenate hydrate (HRO=H 0.22 RuO 2.11 ·nH 2 0, n>0) Electrode for electrochemical supercapacitor is made, and the capacity of electrochemical supercapacitor is studied.
[0204] Disperse the proton-type layered ruthenium acid hydrate in water or dimethylformamide and other solvents (about 40 μg / L), and drop the resulting dispersion onto the cut surface of the glassy carbon rod (diameter 5mm), further as a fixed A perfluorocarboxylic acid ionomer sold by DuPont under the name of Nafion was dropped and dried to produce a glassy carbon (hereinafter referred to as HRO / GC) electrode loaded with proton-type layered ruthenate hydrate.
[0205] Use HRO / GC electrode, platinum mesh counter electrode, and Ag / AgCl reference electrode in 0.5M sulfuric acid electrolyte, scan at 500-2mV / s to obtain cyclic voltammetry spectrum (CV). 18 to 23 are CVs when the scanning speed is 500mV / s, 200mV / s, 50mV / s, 20mV / s, 5mV / s and 2mV / s respe...
Embodiment 3
[0220] In the above-mentioned embodiment 2, the capacity of the proton-type layered ruthenate hydrate in sulfuric acid is described, but the present invention is also applicable to the potassium-type layered ruthenate hydrate or various alkaline electrolytes.
[0221] (1) For the capacitance of the proton-type layered ruthenate hydrate in the alkaline electrolyte, the proton-type layered ruthenate hydrate was synthesized by the same method as in the above-mentioned Example 2, except that the KOH electrolyte of 1M was used instead of 0.5 M sulfuric acid electrolyte, other is identical with above-mentioned embodiment 2 to test electric capacity. The results are shown in Table 10. Compared with rutile-type ruthenium oxide nanoparticles with nanoscale particle size, 5 times capacitance can be obtained. The reason why the capacitance is smaller than that of the 0.5M sulfuric acid electrolyte is that the simulated capacity decreases due to redox in the alkaline electrolyte.
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Abstract
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