Direct methanol fuel cell positive pole catalysts and method for producing the same
A methanol fuel cell and catalyst technology, which is applied in catalyst activation/preparation, battery electrodes, chemical instruments and methods, etc., can solve the problem of low electrocatalytic activity of catalysts and achieve the effect of high electrocatalytic activity
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[0021] According to the preparation method provided by the present invention, the preparation process of the suspension includes mixing the carbon carrier, the dispersion liquid and the platinum compound, molybdate, vanadate and cobalt salt.
[0022] In the preparation method provided by the present invention, preferably, the preparation method of the suspension comprises the following steps:
[0023] (1) Disperse the carbon carrier in the dispersion liquid at 30-90°C;
[0024] (2) Add platinum compounds, molybdates, vanadates and cobalt salts into the above-mentioned dispersion liquid dispersed with carbon carriers, control the temperature at 30-90°C, and pH at 3-10, so that the carbon carriers can absorb platinum compounds, molybdenum salts, vanadates and cobalt salts.
[0025] In the preparation method of the above-mentioned suspension, preferably, after the step (1), it also includes the step of adding the dispersion liquid dispersed with the carbon carrier into a protect...
Embodiment 1
[0036] Grind 200 mg of powdered VXC-72 activated carbon for 2 hours, then place the ground activated carbon in a muffle furnace and sinter at 700°C for 3 hours under a nitrogen atmosphere, then grind for 2 hours, pass through a 800-mesh sieve, and place in a desiccator for later use.
[0037] Prepare 40 ml of a mixed solution of ethylene glycol and tartaric acid (1:1), and add it into the reaction vessel as a protective solvent for preparing the catalyst. Use 20 grams of isopropanol as the dispersion liquid, stir the above-mentioned activated carbon powder with the dispersion liquid evenly, then ultrasonically disperse at a frequency of 50 kHz for 10 minutes at 30 ° C, and then transfer to a container containing the above-mentioned protective solvent. In the reaction vessel, keep stirring for 0.1 hour, so that the dispersion liquid dispersed with activated carbon and the protective solvent are uniformly mixed.
[0038] According to the atomic molar ratio of Pt:Mo:V:Co=1:0.1:0....
Embodiment 2
[0043] Grind 200 mg of powdered VXC-72 activated carbon for 3 hours, then place the ground activated carbon in a muffle furnace and sinter at 600°C for 4 hours under an inert gas atmosphere, then grind for 3 hours, pass through a 800-mesh sieve, and place in a desiccator for later use .
[0044] Prepare 50 ml of a mixed solution of water and tartaric acid (1:1), and add it into the reaction vessel as a protective solvent for preparing the catalyst. Using 200 grams of isopropanol as the dispersion liquid, the activated carbon powder prepared above was stirred evenly with the dispersion liquid, and then ultrasonically dispersed at a frequency of 20 kHz at 90 ° C for 80 minutes, and then transferred to a container containing the above protective solvent. In a reaction vessel, the stirring was continued for 4 hours, so that the dispersion liquid dispersed with activated carbon and the protective solvent were uniformly mixed.
[0045] 267 mg of chloroplatinic acid, 62.5 mg of sodi...
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