Fuel cell, catalyst with core-shell structure and preparation method thereof
A core-shell structure and catalyst technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, battery electrodes, etc., can solve the problems of low Pt content of catalysts, affecting the preparation efficiency of core-shell structure catalysts, and high cost, so as to maintain catalytic performance. Active, safe and reliable, simple technical solutions
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[0054] Such as figure 1 Shown, described preparation method comprises steps:
[0055] Step S100, dispersing the X salt solution into the platinum-carbon catalyst solution containing 30%-70% platinum to form a suspension.
[0056] In this step, X is the transition metal. Described X salt can be the nitrate of X (X(NO 3 ) 2 ), sulfate (XSO 4 ), chloride salt (XCl 2 ), fluoride salt (XF 2 ), Bromide (XBr 2 ) and iodized salt (XI 2 ).
[0057] The X salt solution is a solution of X metal ions. Taking X as cobalt metal as an example, the X salt solution may be a cobalt nitrate salt solution. A solvent of ethanol and water or an ethanol solvent can be selected to dissolve the X salt to obtain the X salt solution.
[0058] This application is based on a platinum-carbon catalyst with a high platinum content (platinum content is 30% to 70%). When preparing a platinum alloy carbon catalyst, the molar ratio of platinum and X is 1:3 to 3:1. Along with the increase of platinum c...
Embodiment 1
[0093] First, the liquid-phase reduction process of the platinum alloy carbon catalyst was realized.
[0094] The platinum carbon catalyst (0.303g) containing platinum 46.5wt% is dispersed in the mixed solvent of 6ml deionized water and 12ml ethanol by ultrasonic (instrument model 8892, Core-Parmer company) to form a uniform suspension, meanwhile, 0.22g Cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 (2) and 0.396g tetraoctylammonium bromide are dissolved in the ethanol solvent of 12ml to form cobalt nitrate solution, then described cobalt nitrate solution is added dropwise in the platinum carbon suspension solution to form mixed solution; Stir described mixed solution, and in While keeping stirring, mix the mixed solution into a uniform solution; adjust the pH value of the mixed solution to about 4 to make the mixed solution acidic. Next, pass an inert gas (the inert gas can be nitrogen, helium or argon) into the mixed solution to remove oxygen for more than 1 hour, so as to...
Embodiment 2
[0106] Different from Example 1, in this example, the type of X salt is cobalt chloride (CoCl 2 ).
[0107] In this embodiment, in the process of realizing the liquid phase reduction of the platinum alloy carbon catalyst, the cobalt chloride solution is added dropwise into the platinum carbon suspension solution to form the mixed solution.
[0108] Described cobalt chloride solution is about 0.1g effective cobalt chloride (CoCl 2 ) of the hydrated compound and 0.396g tetraoctylammonium bromide are dissolved in the ethanol solvent of 12ml to form.
[0109] In this embodiment, the molar ratio of platinum and cobalt is 1:1. The number of moles of tetraoctylammonium bromide is the same as that of cobalt nitrate. For other preparation processes, please refer to Example 1.
[0110] Carry out to the platinum alloy carbon particle catalyst prepared by the present embodiment:
[0111] After the cyclic voltammetry test was carried out on the platinum-cobalt alloy carbon particle ca...
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Abstract
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