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A catalyst and chemical technology, applied in the field of catalyst manufacturing, can solve the problems of high cost of platinum catalyst, and achieve the effects of easy expansion of production, simple preparation process and excellent durability
Inactive Publication Date: 2015-06-17
NANJING UNIV OF TECH
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Problems solved by technology
The research on proton exchange membrane fuel cells has made great progress, but there is still a certain distance from commercial application. One of the main reasons is the high cost of platinum catalysts.
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Embodiment 1
[0034] (1) Activated carbon is used as a carrier for activation treatment:
[0035] Weigh a certain amount of carbon powder and heat it in a tube furnace at 700°C for 80 minutes under an inert atmosphere
[0036] (2) Disperse the treated carbon powder with ethylene glycol, ultrasonically form a uniform slurry, add silver and cobalt precursor solutions to it, reduce it with sodium borohydride at room temperature for 48 hours, filter, wash, and dry for later use, and record it as Ag -Co / C
[0037] (3) Dissolve Ag-Co / C with ethylene glycol and ultrasonically form a uniform slurry
[0038] (4) Using the in-situ chemical reduction homogeneous deposition method, the platinum precursor and NaHSO 3 role, generate complex ions, and then use H 2 o 2 Oxidation to produce a metastable colloid, control the pH of the solution during the reaction = 6
[0039] (5) Add to the homogeneous slurry of Ag-Co / C, reduce with reducing agent formaldehyde, stir at 60°C for 1.5h
[0040] (6) After ...
Embodiment 2
[0043] (1) Carbon nanotubes are used as carriers for activation treatment:
[0044] Weigh a certain amount of carbon nanotubes, soak them in concentrated nitric acid for 12 hours, wash them with deionized water, and dry them at 80°C
[0045] (2) Disperse the treated carbon nanotubes with glycerol, form a uniform slurry by ultrasonication, add the silver and cobalt precursor solution to it, reduce it with sodium borohydride at room temperature for 10 h, filter, wash, and dry for later use. Ag-Co / C
[0046] (3) Disperse Ag-Co / C with glycerol and form a homogeneous slurry by ultrasonic
[0047] (4) Using the in-situ chemical reduction homogeneous deposition method, the platinum precursor and NaHSO 3 role, generate complex ions, and then use H 2 o 2 Oxidation to produce a metastable colloid, control the pH of the solution during the reaction = 8
[0048] (5) Add to the homogeneous slurry of Ag-Co / C, reduce with reducing agent sodium borohydride, stir at 40°C for 1.5h
[0049...
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Abstract
The invention relates to a preparation method of a proton exchange membrane fuel cell carbon-supported metal electrocatalyst. The active component of the electrocatalyst is Pt-Ag-Co, an atom ratio of Pt:Ag:Co is 20:1:0.01-1:20:0.01, and the mass percentage content of the active component is 10-50%. The preparation method comprises the following steps: 1, dissolving processed carbon powder in an alcohol solvent, carrying out ultrasonic treatment to obtain a uniform slurry, adding an Ag and Co precursor solution to the slurry, and mixing; 2, reducing a mixed solution obtained in step 1 by sodium borohydride for 10-24h, washing, and drying to obtain Ag-Co / C; 3, dissolving the Ag-Co / C by alcohol, and carrying out ultrasonic treatment to obtain a slurry; and 4, processing a Pt precursor through an in situ chemical reduction homogeneous precipitation process to prepare complexing ions, processing to prepare a colloid, and carrying out reduction deposition on the colloid in the slurry obtained in step 3 by using a reducing agent formaldehyde in order to prepare the Pt-Ag-Co / C catalyst. The method has the advantages of simple process, low cost and easy enlarged production, and the catalyst has good catalysis activity, and has better durability than commercial Pt / C electrocatalysts and binary Pt-Ag / C electrocatalysts.
Description
1. Technical field [0001] The invention relates to a method for preparing a carbon-supported metal electrocatalyst for a proton exchange membrane fuel cell, belonging to the technical field of catalyst manufacture 2. Technical Background [0002] As a new generation of green energy, proton exchange membrane fuel cells have attracted widespread attention, and have become the first choice to replace fossil fuels due to their characteristics such as fuel regeneration, zero emissions, mobility and high energy conversion efficiency. Hydrogen-powered electric vehicles have more advantages than lithium battery electric vehicles, such as: refueling takes only 5-10 minutes (nearly 100 times shorter than lithium batteries); long cruising range (up to 600-800 kilometers); weight Light (only 1 / 4 to 1 / 3 of lithium battery); long life, and no follow-up pollution problems. The research on proton exchange membrane fuel cells has made great progress, but there is still a certain distance fr...
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