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Carbon-supported core-shell type platinum cobalt-platinum catalyst for fuel cells and preparation method for carbon-supported core-shell type platinum cobalt-platinum catalyst

A fuel cell and platinum catalyst technology, applied in the field of electrochemistry, can solve the problems of low catalytic activity and low utilization rate of platinum, and achieve the effects of promoting further development, reducing preparation cost, and improving utilization rate and stability

Active Publication Date: 2015-04-01
BEIJING UNIV OF CHEM TECH
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  • Summary
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  • Description
  • Claims
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Problems solved by technology

The structurally ordered core-shell FePt nanocatalyst prepared by this method has higher catalytic activity and stability than the commercial platinum catalyst Pt / C, and good dispersion, but its platinum utilization rate is low and the catalytic activity is still small, and it is not suitable for HClO. 4 catalytic oxygen reduction

Method used

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  • Carbon-supported core-shell type platinum cobalt-platinum catalyst for fuel cells and preparation method for carbon-supported core-shell type platinum cobalt-platinum catalyst
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  • Carbon-supported core-shell type platinum cobalt-platinum catalyst for fuel cells and preparation method for carbon-supported core-shell type platinum cobalt-platinum catalyst

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preparation example Construction

[0034] The preparation method of the core-shell platinum-cobalt-platinum catalyst for fuel cells of the present invention comprises two major steps. First, a co-reduction method is used to synthesize a carbon-supported cobalt-platinum alloy Pt- Co / C catalyst; then, the catalyst obtained in the previous step was 2 Structurally ordered core-shell platinum-cobalt-platinum catalyst prepared by annealing at high temperature. Specific steps are as follows:

[0035] (1) Weigh 60-90 mg of carbon spheres and place them in a tripod flask, add 30-50 ml of ethylene glycol (EG), ultrasonically disperse at room temperature for 0.5-1 h, and then add ethylene glycol (EG) of soluble cobalt salt under stirring Alcoholic solution and ethylene glycol solution of chloroplatinic acid, so that the mass ratio of carbon, cobalt ion and platinum ion in the mixed solution is 6~9:1.5:3, magnetically stirred for 3h;

[0036] (2) Use potassium hydroxide solution dissolved in ethylene glycol to adjust the...

Embodiment 1

[0041] (1) Weigh 80mg of carbon powder (XC-72 carbon black, the same below) into a conical flask, add 40ml of ethylene glycol, and ultrasonicate at room temperature for 1 to 2 hours to evenly disperse the carbon powder in ethylene glycol;

[0042] (2) 7.39mg cobalt chloride hexahydrate (CoCl 2 ·6H 2 O) and 48.27mg chloroplatinic acid (H 2 PtCl 6 ·H 2 O) Dissolve in ethylene glycol and sonicate for 1 h to make it homogeneous. Then, under strong stirring at room temperature, the above-mentioned precursors of Pt and Co were added dropwise and stirred for 3 h;

[0043] (3) Under room temperature and magnetic stirring, adjust the pH of the above reaction slurry to 10 with 1M KOH / EG solution, and stabilize it for 0.5h;

[0044] (4) Under nitrogen atmosphere protection and magnetic stirring, utilize oil bath to heat the above-mentioned reaction liquid, make its temperature reach 80 ℃, then slowly add 15ml of sodium borohydride (NaBH) dissolved in ethylene glycol dropwise 4 / EG,...

Embodiment 2

[0048] (1) Weigh 90mg of carbon powder into a conical flask, add 40ml of ethylene glycol, and ultrasonicate for 1-2 hours at room temperature, so that the carbon powder is evenly dispersed in ethylene glycol;

[0049] (2) 3.70mg cobalt chloride hexahydrate (CoCl 2 ·6H 2 O) and 23.14mg chloroplatinic acid (H 2 PtCl 6 ·H 2 O) Dissolve in ethylene glycol and sonicate for 1 h to make it homogeneous. Then, under strong stirring at room temperature, the above-mentioned precursors of Pt and Co were added dropwise and stirred for 3 h;

[0050] (3) Under room temperature and magnetic stirring, adjust the pH of the above reaction slurry to 10 with 1M KOH / EG, and stabilize it for 0.5h;

[0051] (4) Under nitrogen atmosphere protection and magnetic stirring, utilize oil bath to heat the above-mentioned reaction liquid, make its temperature reach 80 ℃, then slowly add 15ml of sodium borohydride (NaBH) dissolved in ethylene glycol dropwise 4 / EG, 2M) solution, make it react 3h;

[00...

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Abstract

The invention relates to a carbon-supported core-shell type platinum cobalt-platinum catalyst for fuel cells and a preparation method for the carbon-supported core-shell type platinum cobalt-platinum catalyst, belonging to the field of electrochemistry. The catalyst comprises the following components in percentage by weight: 60%-90% of a carrier, 1%-20% of cobalt, and 9%-20% of platinum. According to the invention, a mixed solution of ethylene glycol and sodium borohydride acts as a reducing agent, the core-shell type platinum cobalt-platinum catalyst Pt-Co@Pt / C with an ordered structure is prepared by high-temperature annealing treatment. The catalyst with the ordered structure, which is prepared by the invention, has the advantages of low Pt carrying capacity, high catalysis activity, high stability and the like, and the development of fuel cells can be promoted further.

Description

technical field [0001] The invention relates to a carbon-supported core-shell type platinum-cobalt-platinum catalyst for fuel cells and a preparation method thereof. The catalyst is a carbon-supported core-shell type platinum-cobalt-platinum catalyst (Pt-CoPt / C ), belonging to the field of electrochemistry. technical background [0002] In the face of today's global energy crisis, environmental pollution and climate warming, fuel cells that directly convert chemical energy into electrical energy are considered to be the most promising alternatives due to their high energy conversion efficiency, environmental friendliness, and high energy density. Renewable Energy. At present, platinum or its alloy nanocatalysts with good corrosion resistance, excellent electrocatalytic performance and electrochemical performance are still the best fuel cell catalysts. However, platinum resources are scarce and expensive. Reducing the cost of catalysts and preparing platinum-based catalysts...

Claims

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Application Information

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IPC IPC(8): B01J23/89H01M4/92
CPCY02E60/50
Inventor 朱红蔡业政骆明川王芳辉
Owner BEIJING UNIV OF CHEM TECH
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