Nano-porous Pd material prepared through quasi-crystal de-alloying and preparation process of nano-porous Pd material

A nanoporous, dealloying technology, applied in the fields of nanotechnology, nanotechnology, nanotechnology for materials and surface science, can solve problems such as dealloying, achieve low cost, uniform interconnection size, structural integrity high effect

Inactive Publication Date: 2014-07-23
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In many quasicrystal alloy systems, the Al reference crystal containing a small amount of noble metal Pd has the above material characteristics, and it is possible to achieve dealloying

Method used

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  • Nano-porous Pd material prepared through quasi-crystal de-alloying and preparation process of nano-porous Pd material
  • Nano-porous Pd material prepared through quasi-crystal de-alloying and preparation process of nano-porous Pd material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1 Al 70 PD 20 mn 10 alloy

[0035] Step 1: Component weighing and alloy ingot melting

[0036] Will Al 70 PD 20 mn 10 The atomic percent composition of the alloy is converted to a weight percent composition:

[0037] Using industrial purity components, weighing ingredients according to the mass percentage of the alloy; mixing the weighed metal raw materials in a water-cooled copper crucible of a non-consumable arc melting furnace, melting under the protection of high-purity argon, and then Flip the alloy ingot up and down, and smelt it repeatedly for 3 times to obtain an alloy ingot with uniform composition;

[0038] Step 2: Preparation of broadband samples

[0039] The alloy ingot is crushed and put into a quartz tube. The size of the nozzle of the quartz tube is: length 8mm×width 1mm. Put the charged quartz tube in the induction heating coil, use the vacuum copper roll stripping technology, under the protection of high-purity argon, melt the alloy s...

Embodiment 2

[0049] Example 2 Al 72 PD 25 V 3 alloy

[0050] Step 1: Component weighing and alloy ingot melting

[0051] Same as Step 1 in Embodiment 1.

[0052] Step 2: Preparation of broadband samples

[0053] Same as Step 2 in Embodiment 1.

[0054] Step 3: Microstructure analysis of the precursor alloy

[0055] With the step 3 in the embodiment 1, the result shows that Al 72 PD 25 V 3 The alloy is a nearly single-phase three-dimensional icosahedral quasicrystal structure. The grain size is about 0.5-3 μm.

[0056] Step 4: Electrochemical performance test and dealloying test

[0057] Same as Step 4 in Embodiment 1, the measured critical potential is about 0 V. A nanoporous Pd material that can be obtained by dealloying with a constant voltage in the range of 0.0-0.2V.

[0058] Step 5: Structure Characterization and Component Testing of Nanoporous Materials

[0059] Same as Step 5 in Example 1, it is found that the size of the alloy broadband sample before and after deal...

Embodiment 3

[0062] Example 3 Al 74 PD 21 Mg 5 alloy

[0063] Step 1: Component weighing and alloy ingot melting

[0064] Same as Step 1 in Embodiment 1.

[0065] Step 2: Preparation of broadband samples

[0066] Same as Step 2 in Embodiment 1.

[0067] Step 3: Microstructure analysis of the precursor alloy

[0068] With the step 3 in the embodiment 1, the result shows that Al 74 PD 21 Mg 5 The alloy is a nearly single-phase two-dimensional tenth order quasicrystal structure, containing a small amount of Al 3 Pd phase. The grain size is about 1-3 μm.

[0069] Step 4: Electrochemical performance test and dealloying test

[0070] Same as Step 4 in Embodiment 1, the measured critical potential is about 0 V. A nanoporous Pd material that can be obtained by dealloying with a constant voltage in the range of 0.0-0.2V.

[0071] Step 5: Structure Characterization and Component Testing of Nanoporous Materials

[0072] Same as Step 5 in Example 1, it was found that: the dealloying ...

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Abstract

The invention discloses a nano-porous Pd material prepared through quasi-crystal de-alloying and a preparation process of the nano-porous Pd material, belonging to the technical field of new materials. The nano-porous Pd material contains 8-12at.% of Al, less than 1at.% of TM and the balance of Pd in percentage by atom. A precursor namely a quasi-crystal alloy required for preparing the material is low in cost, and the overall technological process is environment-friendly, simple and efficient; a prepared nano-porous structure is complete. The quasi-crystal alloy with special structures is used as the precursor, and the chemical composition of the quasi-crystal alloy is Al1-x-yPdxTMy (TM is Mn, Co, Fe, Cr, V or Mg, wherein x is more than or equal to 10at.% and is less than or equal to 25at.%, and y is more than or equal to 3at.% and is less than or equal to 15at.%); by putting the quasi-crystal alloy into a dilute saline solution under room temperature, the nano-porous Pd material can be obtained through an electro-chemical de-alloying process with a constant-voltage mode in a voltage range of 0-0.2V (a reference electrode is a saturated calomel electrode). Prepared nano-porous Pd is uniform in structure, stable in pore and ligament size and unordered in crystallographic orientation, shows excellent room-temperature ethanol/methanol electro-oxidation reaction catalytic performances in alkaline solutions, can keep the high catalytic performances after being used repeatedly for many times, and can be applied to an anode catalyst of a fuel cell such as an alkaline ethanol cell and the like.

Description

technical field [0001] The invention relates to a nanoporous Pd material prepared by quasicrystal dealloying and a preparation process thereof, belonging to the technical field of new materials. Background technique [0002] Nanoporous metal is a porous metal functional material composed of three-dimensional nanometal ligaments and nanopores connected between them. The material has structural characteristics such as good electrical and thermal conductivity, high specific surface area, and three-dimensionally connected nanopores, and exhibits many unique physical and chemical properties. It has application prospects in areas such as sensory and drug delivery. [0003] The main ways known to prepare nanoporous metals are: template method, Layer-by-Layer self-assembly technology and dealloying method. Among them, the dealloying method has a simple preparation process, high material preparation efficiency, and can directly obtain bulk nanomaterials. The so-called dealloying m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C5/04C22C1/08B82Y40/00B82Y30/00
Inventor 王英敏羌建兵王宝林王清董闯
Owner DALIAN UNIV OF TECH
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