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Nano-porous Pd material with electrooxidation catalytic performances and preparation method

An electro-oxidative catalysis and nano-porous technology, applied in the field of new materials, can solve the problems of easy pore size coarsening, precious metal recovery, brittleness, etc., and achieve uniform and controllable pore size, simple preparation process, and good structural integrity.

Inactive Publication Date: 2013-11-20
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The nanoporous Pd material prepared by the existing dealloying method has the following problems: the mechanical strength of the material is extremely poor, easy to break, and fragile, the integrity of the nanopore structure is poor, the pore size is easy to coarsen, and the recovery of precious metals, etc.

Method used

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  • Nano-porous Pd material with electrooxidation catalytic performances and preparation method
  • Nano-porous Pd material with electrooxidation catalytic performances and preparation method
  • Nano-porous Pd material with electrooxidation catalytic performances and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1Co 0.80 PD 0.195 sn 0.005 alloy

[0042] Step 1: Component weighing and alloy ingot melting

[0043] Will Co 0.80 PD 0.195 sn 0.005 The atomic percent composition of the alloy is converted to a weight percent composition:

[0044] High-purity components are used, and ingredients are made according to the alloy composition; the weighed metal raw materials are mixed and placed in a water-cooled copper crucible of a non-consumable arc melting furnace, and smelted under the protection of high-purity argon, and then the alloy ingot is put up and down Flip, so repeated smelting 3 times, to obtain alloy ingots with uniform composition;

[0045] Step 2: Preparation of broadband samples

[0046] 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 arg...

Embodiment 2

[0056] Example 2Co 0.70 PD 0.28 sn 0.02 alloy

[0057] Step 1: Component weighing and alloy ingot melting

[0058] Same as Step 1 in Example 1.

[0059] Step 2: Preparation of broadband samples

[0060] Same as Step 2 in Example 1.

[0061] Step 3: Microstructure analysis of the precursor alloy

[0062] With step 3 in embodiment 1, the result shows that Co 0.70 PD 0.28 sn 0.02 The broad band of the alloy is a nearly single FCC type solid solution structure, the grain size is about 0.5-3 μm, and there are a small amount of Sn-rich precipitates on the grain boundary and the surface of the matrix.

[0063] Step 4: Electrochemical performance test and dealloying test

[0064] Same as Step 4 in Example 1, the measured critical potential is about 0.3V. Porous materials with good integrity can be obtained by constant voltage dealloying in the range of 0.35-0.45V.

[0065] Step 5: Structure Characterization and Component Testing of Nanoporous Materials

[0066]Same as Ste...

Embodiment 3

[0069] Example 3Co 0.64 PD 0.35 sn 0.01 alloy

[0070] Step 1: Component weighing and alloy ingot melting

[0071] Same as Step 1 in Example 1.

[0072] Step 2: Preparation of broadband samples

[0073] Same as Step 2 in Example 1.

[0074] Step 3: Microstructure analysis of the precursor alloy

[0075] With step 3 in embodiment 1, the result shows that Co 0.64 PD 0.35 sn 0.01 The broad band of the alloy is a nearly single FCC type solid solution structure, the grain size is about 0.5-3 μm, and there are a small amount of Sn-rich precipitates on the grain boundary and the surface of the matrix.

[0076] Step 4: Electrochemical performance test and dealloying test

[0077] Same as Step 4 in Example 1, the measured critical potential is about 0.42V. Porous materials with good integrity can be obtained by constant voltage dealloying in the range of 0.45-0.55V.

[0078] Step 5: Structure Characterization and Component Testing of Nanoporous Materials

[0079] Same as S...

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Abstract

The invention provides a nano-porous Pd material with electrooxidation catalytic performances and a preparation method, belongs to the new material technical field. The nano-porous Pd material contains elements Pd, Co and Sn. The chemical composition of the alloy precursor materials is Co1-x-yPdxSny, wherein x and y are atomic percents, x is more than or equal to 10% and less than or equal to 40%, and y is more than 0% and less than or equal to 5%. According to different precursor alloy components, the diameters of hole sizes and ligaments are controlled between 2-20 nanometers. The preparation method is as follows: through combination of non-consumable arc melting and water cooling copper roller melt spinning technologies, Co-Pd-Sn broadband solid solution alloy precursor materials are prepared; then the precursor alloy materials are taken as working electrodes, and subjected to electrochemical dealloying at room temperature in weak acidic conditions to obtain nano- porous Pd material. The nano-porous Pd material is advantaged by low cost, simple preparation technology, good structural integrity and controllable and uniform hole sizes. The nano-porous Pd material has good catalytic performances to electrooxidation reactions of small organic molecules of ethanol, methanol and the like in alkaline solutions, and can be used as anodic reaction catalysts of alkaline ethanol fuel cells, or as anode supporting materials directly.

Description

technical field [0001] The invention relates to a nanoporous Pd material with electro-oxidation catalytic performance and a preparation method thereof, belonging to the technical field of new materials. Background technique [0002] Nanoporous metal is a metal material with special structure composed of nanoscale pores and metal ligaments in between, which has the characteristics of metallicity, high specific surface area and nanoscale structure. Due to surface effects, quantum size, and tunneling effects, nanoporous metals display many unique physical and chemical properties, which have promising applications in the fields of filtration, surface catalysis, surface-enhanced Raman scattering, surface plasmon resonance, sensing, and drug delivery. [0003] At present, the main ways to prepare nanoporous metal materials are: template method, Layer-by-Layer self-assembly technology and dealloying method. Among them, the dealloying method is widely used because of its simple pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C5/04C25C5/02
Inventor 王英敏羌建兵王宝林王清董闯
Owner DALIAN UNIV OF TECH
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