Anode catalyst for preparing ozone through pure water electrolysis, membrane electrode and preparation method
A catalyst, pure hydropower technology, applied in the direction of electrodes, electrolytic components, electrolytic process, etc., can solve the problems of low voltage, high lead toxicity, hidden dangers for users, etc., and achieve good stability, good conductivity, and high safety.
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[0037] The preparation method of described anode catalyst comprises the steps:
[0038] Step a: adding precursors containing metal elements to the alkaline aqueous solution in different molar ratios to form a mixed solution, the metal elements including iridium and doping metals, the doping metals including at least one of niobium and tantalum .
[0039] Nb and Ta have high stability, good conductivity, and fast conduction speed of oxygen vacancies or active oxygen sites, which is conducive to ozone generation, can improve the ozone selectivity of the catalyst, and corrosion resistance, and improve the service life of the anode catalyst as an anode.
[0040] The precursors may be salts or oxides. Specifically, the molar percentage of the iridium-containing precursor is 30 mol% to 60 mol%, preferably, it may be 40 mol% to 60 mol%.
[0041] Precursors containing iridium elements include Ir, IrCl 3 and H 2 IrCl 6 At least one of; the precursor containing doping metal includes ...
Embodiment 1
[0068] (1) Soak and wash two polytetrafluoroethylene films in ethanol and deionized water in order to remove surface impurities.
[0069] (2) Prepare the anode catalyst, including: by IrO 2 For 50mol% ratio, weigh 1.815g IrCl 3 (Ir content ≥ 54.0%), 2.756g NbCl 5 , add 0.02mol / L KOH aqueous solution, mix evenly, heat up to 70°C, keep stirring for 3 hours, and obtain an alkaline precipitate solution; stir the alkaline precipitate solution, gradually cool to 50°C, and add 2 times the molar amount Stir the MgO powder of the alkaline precipitate for 1.5 h, and carry out suction filtration. After suction filtration, dry the filter residue in a drying oven at 60° C. overnight; calcinate the dried filter residue in an air atmosphere at 800° C. for 5 h, And cool naturally; use 0.5mol / LH for the cooled product 2 SO 4 The solution was stirred for 1.5 hours, then washed with deionized water, and repeated 4 times until the conductivity of the filtrate was ≤0.6 μS / cm, and then dried ov...
Embodiment 2
[0079] (1) First, pre-treat the polytetrafluoroethylene film in ethanol and deionized water to remove surface impurities.
[0080] (2) Preparation of anode catalyst: by IrO 2 For 45mol% ratio, weigh 1.602g IrCl 3 (Ir content ≥ 54.0%), 1.479g Nb 2 o 5 Add 0.02mol / L KOH aqueous solution, mix well, heat up to 70°C, heat and stir for 3h, after fully reacting, stir and cool to 50°C, add MgO powder with a molar mass twice that of the alkaline precipitate, stir for 1.5h, and Suction filtration was carried out, and the filter residue was dried overnight in a drying oven at 60°C after suction filtration. The dried filter residue was calcined at 800°C for 5h in air atmosphere, and cooled naturally. Use 0.5mol / L H for the cooled product 2 SO 4 The solution was stirred for 1.5 hours, then washed with deionized water, and repeated 4 times until the conductivity of the filtrate was ≤0.6 μS / cm, and then dried overnight in a drying oven at 60°C to obtain the anode catalyst, specifically...
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