Carbon-based platinum-silver-palladium ternary alloy catalyst and preparation method thereof

A ternary alloy and catalyst technology, applied in electrical components, nanotechnology for materials and surface science, structural parts, etc., can solve problems such as low cost, and achieve the effect of simple and easy synthesis method and easy operation

Active Publication Date: 2018-04-06
江苏群菱能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the main difficulty is how to solve the technical pr...

Method used

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  • Carbon-based platinum-silver-palladium ternary alloy catalyst and preparation method thereof
  • Carbon-based platinum-silver-palladium ternary alloy catalyst and preparation method thereof
  • Carbon-based platinum-silver-palladium ternary alloy catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1) The carbon black is acidified with nitric acid under the conditions of condensation and reflux at a temperature of 120°C: a quantitative amount of carbon black is added to a three-port container, and then an excessive amount of concentrated nitric acid (commercially purchased analytically pure, mass fraction 68%) 120 The solution was stirred for 1 hour under the condition of an oil bath. Raise the temperature to 1000°C, keep it warm for 10 hours, then cool the solution, centrifugally filter, wash until neutral, dry, and grind for later use. At this time, the carbon black is hollow carbon black. The volume of the prepared hollow carbon black is about 30% larger than that of the raw carbon black.

[0038] 2) Preparation of Alloy Pd-Pt-Ag / C Catalyst

[0039] First weigh 100mg of hollow carbon black and put it into a beaker, add 50ml of ethylene glycol solution (a mixture of ethylene glycol and water in a 2:1 mass ratio), ultrasonicate for 20min, and pipette an appropria...

Embodiment 2-7

[0043] Adopt the same operation as Example 1, change the addition ratio of silver ammonia solution, chloroplatinic acid solution, palladium nitrate solution and make Pt10Ag80Pd10 / C, Pt20Ag70Pd10 / C, Pt30Ag50Pd20 / C, Pt40Ag40Pd20 / C, Pt50Ag30Pd20 / C, Pt30Ag60Pd10 / C C catalyst.

[0044] Through TEM and SEM tests, it is known that the particle size of the metal particles is about 6.4nm, and they are evenly loaded on the surface of the carbon black carrier, see Figure 6 . Through XRD and XPS tests, it can be seen that the synthesized metal nanoparticles are alloy solid solution with silver as solvent and platinum and palladium as solute.

[0045] theoretical calculation

[0046] Figure 5 Schematic diagram for theoretical calculation of ORR activity on Pt-Pd-Ag(111) and Pt(111) surfaces. The activity was shown by calculating the electron transfer number for oxygen reduction. On the basis of the RDE of the rotating disc electrode, test the LSV curves at different speeds, and then...

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Abstract

The invention provides a carbon-based platinum-silver-palladium ternary alloy catalyst. According to the catalyst, a platinum-silver-palladium ternary alloy is uniformly supported on a carbon black surface with a hollow structure; the platinum-silver-palladium ternary alloy is an alloy solid solution taking silver as a solvent and taking platinum and palladium as solutes, and the particle size ofthe supported alloy particles is 6-8nm. The invention further provides preparation and application of the carbon-based platinum-silver-palladium ternary alloy catalyst. The carbon-based platinum-silver-palladium ternary alloy catalyst provided by the invention is a platinum-palladium-silver (Pt-Pd-Ag) ternary alloy layer redox catalyst with low Pt capacity, and an oxygen reduction catalyst with high activity and high stability. The mass activity of the catalyst is about 12 times that of a commercial Pt/C catalyst, and after tested by 50000 cycles, the stability of the catalyst is also kept invariable.

Description

technical field [0001] The invention belongs to the field of energy materials, and in particular relates to a fuel cell catalyst and a preparation method thereof. Background technique [0002] The development and utilization of new energy sources has been receiving much attention. Fuel cell energy, as a clean energy with high conversion rate, has been more widely used. The depletion of fossil fuels and the environmental crisis brought about by their combustion have gradually focused people's attention on new energy sources and their utilization methods; with the development of science and technology, electrochemistry has become the key and key to solving the current problem. important means. In the field of electrochemistry, fuel cells have attracted much attention and expectations due to their advantages such as no pollution, high energy conversion rate, and wide application range; there is no doubt that fuel cells will eventually become one of the important ways to obtain...

Claims

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Application Information

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IPC IPC(8): H01M4/92B82Y30/00
CPCB82Y30/00H01M4/921H01M4/926Y02E60/50
Inventor 姚乃元
Owner 江苏群菱能源科技有限公司
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