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Preparation method of carbon-supported nano platinum alloy catalyst

A technology of alloy catalyst and nano-platinum, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems affecting the uniformity of catalyst composition performance, quality reduction, etc., to improve the area specific activity, Effect of reducing carbon loss and reducing carbon carrier loss

Active Publication Date: 2015-05-06
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But at present, this method faces an urgent problem to be solved: when the carrier carbon is in the conditions of platinum, transition metal compound, reducing atmosphere and high temperature, its mass will be significantly reduced, which will cause the migration of nanoparticles on the carrier, Fusion grows, which ultimately affects catalyst composition and performance uniformity

Method used

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  • Preparation method of carbon-supported nano platinum alloy catalyst
  • Preparation method of carbon-supported nano platinum alloy catalyst
  • Preparation method of carbon-supported nano platinum alloy catalyst

Examples

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Embodiment 1

[0037] The present embodiment relates to a kind of preparation method of carbon-supported nanometer platinum alloy catalyst (Pt-alloy / C), described method comprises the steps:

[0038] Step 1, 1g Pt / C catalyst (platinum content is 30wt%) is added to 200ml acid copper sulfate solution (0.05M CuSO 4 , 0.05MH 2 SO 4 ), and ultrasonically disperse for 30mins, and remove oxygen for 30mins; the negative and anode materials are both graphite, and the reference electrode is a saturated calomel electrode. The three-electrode system is accompanied by a mechanical stirring device; the cathode is set at the underpotential deposition potential of Cu Nearby, maintain a constant potential for 2mins to obtain Cu-Pt / C.

[0039] Step 2, impregnating Cu-Pt / C in Co(NO 3 ) 2 ·6H 2 In the 20ml aqueous solution of O 2.695g, follow-up adopts the combination mode of ultrasonic and ordinary mechanical stirring, ultrasonic 30mins, ordinary mechanical stirring 30mins, repeat twice, obtain Cu-Pt / C su...

Embodiment 2

[0046] This embodiment is a modification of Embodiment 1, and the only difference is that in step 2, the 3d transition metal ions are derived from nickel nitrate.

[0047] Effect: The mass specific activity value of the catalyst prepared in this example measured at a voltage of 0.9V is 0.48A mg Pt -1 .

Embodiment 3

[0049] This embodiment is a modification of Embodiment 1, and the only change is that in step 2, Co(NO 3 ) 2 ·6H 2 The concentration of O is 0.20mmol / L.

[0050] Effect: The mass specific activity value of the catalyst prepared in this example is 0.45Amg when the cell voltage is 0.9V Pt -1 .

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Abstract

The invention provides a preparation method of a carbon-supported nano platinum alloy catalyst. The method comprises the following steps: I. depositing Cu on the surfaces of Pt / C carbon-supported nano platinum catalyst particles by utilizing an underpotential deposition method to obtain Cu-Pt / C; II. dispersing Cu-Pt / C in a solution containing 3d transition metal ions uniformly to obtain Cu-Pt / C suspension, and drying the Cu-Pt / C suspension to obtain a dried sample; III. ball-milling the dried sample, and putting the dried sample in a reducing atmosphere to be reduced and alloyed; IV. dealloying the sample obtained in the step III, and washing and drying to obtain the carbon-supported nano alloy catalyst. The preparation method provided by the invention has the beneficial effects that the losses caused because carbon support materials undergo high temperature can be effectively reduced, thus relieving the problem of severe fused growth of carbon-supported Pt alloy nanoparticles at high temperature; the nano platinum alloy catalyst prepared by the method has the advantages of small platinum alloy particle size, good dispersibility and high catalytic oxygen reduction property.

Description

technical field [0001] The invention relates to a preparation method of a carbon-supported nano-platinum alloy catalyst (Pt-alloy / C), which belongs to the technical fields of material synthesis and electrochemistry. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) has attracted extensive attention due to its low operating temperature (about 80 °C), high power density, fast start-up, and fast power matching speed. In many types of fuel cells, H 2 / Air PEMFC is the first choice for powering light vehicles and buildings. Recently, Thomas et al. compared pure electric fuel cell vehicles with secondary battery pure electric vehicles. The research on weight, volume, cost, CO 2 A comprehensive comparison of emissions, fuel supply or charging time, energy conversion efficiency, service life and other factors shows that when the cruising range of the car is above 160km (100miles), fuel cells have more advantages than secondary batteries. [0003] At presen...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/92B82Y30/00
CPCB82Y30/00B82Y40/00H01M4/8853H01M4/8878Y02E60/50
Inventor 章俊良朱凤鹃夏国锋沈水云胡宸溢
Owner SHANGHAI JIAO TONG UNIV
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