Multicomponent nano porous palladium-base alloy and preparation method thereof
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A nanoporous, palladium-based alloy technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of difficult to control alloy ratio, inability to mass production, unfavorable promotion and application, etc. Achieve the effect of good alloying degree, high production efficiency and simple process
Inactive Publication Date: 2015-05-20
张忠华
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Although the above methods can prepare nano-scale Pd-based alloy catalysts, there are problems such as complex process and the need to precisely control experimental conditions, so it cannot be mass-produced, and it is difficult to control the alloy ratio, which is not conducive to industrial application.
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Embodiment 1
[0034] (1) Weigh pure Al powder, pure Cu powder, pure Ti powder and pure Pd powder (purity ≥ 99.5%, mass ratio) in sequence according to the atomic percentage of 60% Al, 30% Cu, 4% Ti and 6% Pd. Weigh 30g. Use a stainless steel ball mill tank, weigh stainless steel balls according to the ball-to-material ratio of 15:1, and weigh the grinding aid (stearic acid) with a mass ratio of 10 mm, 6 mm, and 4 mm in diameter of the grinding balls 1:1:1 , and its weight is 1~2% (mass ratio) of the powder.
[0035] (2) Add the powder and balls into the ball mill tank in the order of "ball first, then feed", set the speed of the high-energy ball mill to 400 rpm, stop for 10 minutes every 30 minutes, set the automatic forward and reverse, The ball milling time is 100 hours, and the Al-Pd-Cu-Ti alloy powder is obtained after the ball milling treatment.
[0036] (3) The Al-Cu-Pd-Ti alloy powder was ultrasonically cleaned in absolute ethanol, and the sample was rinsed with deionized water aft...
Embodiment 2
[0040]Except that the pure Al powder, pure Cu powder, pure Ti powder and pure Pd powder (purity ≥ 99.5%, mass ratio) are weighed sequentially according to the atomic percentage of 55% Al, 30% Cu, 5% Ti and 10% Pd, other same Example 1. The obtained multi-component nanoporous Pd alloy powder has a size of 300 nm and a nanopore diameter of 4 nm.
Embodiment 3
[0042] Except that the pure Al powder, pure Cu powder, pure Ti powder and pure Pd powder (purity ≥ 99.5%, mass ratio) are weighed sequentially according to the atomic percentage of 75% Al, 20% Cu, 4% Ti and 1% Pd, other same Example 1. The obtained multi-component nanoporous Pd alloy powder has a size of 100 nm and a nanopore diameter of 2.5 nm.
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Abstract
The invention discloses a multicomponent nano porous palladium-base alloy and a preparation method thereof. The alloy has a three-dimensional bicontinuous ligament/channel nano porous structure. The preparation method comprises the following steps: mixing Al powder, Cu powder, Pd powder and X powder together evenly, and then performing ball milling in a ball mill for mechanical alloying treatment, thereby obtaining an Al-Cu-Pd-X precursor alloy; cleaning the Al-Cu-Pd-X precursor alloy in absolute ethyl alcohol firstly, flushing with water, and then putting into a nitric acid solution for de-alloying treatment; washing the alloy obtained after the de-alloying treatment by use of water until the washing water is neutral, next, putting the alloy in water for ultrasonic crushing so that the alloy can be dispersed evenly, and drying after the ultrasonic crushing, thereby obtaining the multicomponent nano porous palladium-base alloy. According to the preparation method of the multicomponent nano porous palladium-base alloy, the precursor alloy is prepared by use of the mechanical alloying method; the process is simple, and the production efficiency is greatly improved; the obtained nano porous palladium-base alloy is relatively small in dimension, has extremely high methanol resistance, stability and catalytic activity, and can be used as a cathode catalyst of a fuel cell.
Description
technical field [0001] The invention relates to a multi-component nano-porous palladium-based alloy and a preparation method thereof, belonging to the technical field of nano-metal materials. Background technique [0002] With the environmental pollution caused by the excessive use of traditional fossil fuels and the energy crisis caused by the depletion of fossil fuels, the development of sustainable energy and efficient energy conversion devices has attracted more and more attention. Among them, fuel cells are more and more popular due to their advantages of environmental friendliness and designability. Proton exchange membrane fuel cells (PEMFC) exhibit the highest power density among all fuel cell types, and at the same time have the characteristics of the fastest start-up and switch cycles, so they are very suitable for portable power sources and transportation vehicles, and are more advanced in terms of technology and applications. prospect. [0003] In the compositi...
Claims
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