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Fe-Pd-based nano-porous material and preparation method thereof

A nanoporous, fe-pd technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem that it is difficult to efficiently prepare nanoporous materials in alloy systems, and achieve excellent electrocatalytic performance, Short production cycle, simple and efficient preparation process

Active Publication Date: 2018-11-06
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved in the present invention is to overcome the limitations of the alloying system applicable to the dealloying method and the difficulty in efficiently preparing nanoporous materials with excellent electrocatalytic properties, and provide a method for preparing nanoporous materials from Fe-Pd-based amorphous alloys method

Method used

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  • Fe-Pd-based nano-porous material and preparation method thereof
  • Fe-Pd-based nano-porous material and preparation method thereof
  • Fe-Pd-based nano-porous material and preparation method thereof

Examples

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Embodiment 1

[0028] Example 1: Fe 70 PD 20 P 10 Preparation of Nanoporous Materials by Chemical Dealloying of Amorphous Alloys.

[0029] Step 1: Ingredients

[0030] According to Fe 70 PD 20 P 10 The atomic percentage of the alloy composition is converted into a weight percentage, using high-purity Fe (99.9mass%), Fe 3 P (99.5mass%), Pd (99.9mass%) elements and compounds are weighed according to the composition of the alloy.

[0031] Step 2: Melting the master alloy ingot.

[0032] Place the prepared metal raw materials in the Nisshin Giken NEV-SM04 vacuum induction melting device, and vacuumize to 8×10 -3 Pa below, and under the protection of high-purity argon (purity 99.99%) fully smelted to obtain the master alloy ingot.

[0033] Step 3: Preparation and Characterization of Amorphous Alloy Ribbon.

[0034] Using Japan's Nisshin Giken NEV-SM04 vacuum quenching belt device, the vacuum degree is lower than 2.0×10 -3 Below Pa, and filled with high-purity argon protection (purity...

Embodiment 2

[0039] Example 2: Fe 70 PD 20 P 10 Amorphous alloy increases the chemical dealloying time to 5h to prepare nanoporous materials

[0040] Method is with embodiment 1, and difference is:

[0041] (1) Fe 70 PD 20 P 10 Nanoporous materials were prepared by dealloying amorphous alloy strips in 0.1 L of concentrated nitric acid solution with a mass fraction of 65% at 25 °C for 5 h.

[0042] (2) After chemical dealloying for 5 hours, a nanoporous material with a three-dimensional uniform network structure was prepared with a pore size of 55-90 nm and a pore wall size of 10-30 nm; Figure 4 shown.

[0043] (3) Increase the chemical dealloying time to 5h, which promotes Fe 70 PD 20 P 10 With the chemical dealloying of the amorphous alloy thin strip, the Fe element continues to corrode and dissolve, and the pore size of the nanoporous material continues to corrode and become larger. It shows that in the acidic solution, increasing the chemical dealloying time promotes the cor...

Embodiment 3

[0044] Example 3: Fe 60 PD 20 P 20 Preparation of nanoporous materials by chemical dealloying of amorphous alloys for 5 hours

[0045] Method is with embodiment 1, and difference is:

[0046] (1) Press Fe 60 PD 20 P 20 Nominal composition batch melting and vacuum quenching strip alloy prepared into 2 mm wide × 30 μm thick Fe 60 PD 20 P 20 Amorphous alloy thin strip;

[0047] (2) Fe with a width of 2 mm × thickness of 30 μm 60 PD 20 P 20 After chemical dealloying of the amorphous alloy ribbon in 0.1 L of concentrated nitric acid solution with a mass fraction of 65% at 25 °C for 5 h, the sample formed a large number of corrosion crack structures with a width of 50-180 nm, as shown in the attached Figure 5 shown.

[0048] (3) Fe 60 PD 20 P 20 Amorphous alloy ribbon with Fe 70 PD 20 P 10 Compared with amorphous alloys, due to the decrease of Fe element, Fe 70 PD 20 P 10 Amorphous alloys are more prone to corrosion and dissolution of Fe elements, and diffusio...

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Abstract

The invention provides a nanoporous material and a preparation method thereof, and belongs to the technical field of new materials. The nanoporous material, namely a catalytic material, with a uniformnet structure is prepared by adopting Fe-Pd-P amorphous alloy as precursor alloy and adopting a chemical dealloying process under the acid environment at room temperature, and the prepared Fe-Pd-based nanoporous material has a high electro-catalytic property on methanoic acid and the like. The prepared nanoporous material is used as an electrode material, so that the electro-catalytic property onmethanoic acid is obviously improved. Compared with traditional metal material, the prepared nanoporous material is uniform in structure, high in specific surface area and high in stability, and hasno CO poisoning phenomenon in the electro-catalytic process of methanoic acid; the chemical dealloying method is low in cost, simple and efficient, and easy to realize industrial production; and the prepared nanoporous material is widely applied in the field of new energy electrode materials such as fuel cells.

Description

technical field [0001] The invention belongs to the field of new materials, and in particular relates to a nanoporous material prepared from an Fe-Pd-based amorphous alloy and a preparation method thereof. Background technique [0002] Nanoporous materials are a research hotspot in the field of new materials. Compared with traditional metal materials, nanoporous metal materials have high specific surface area and special surface boundary properties, and are widely used in fuel cells, capacitors, sensors, catalysis and other fields. [0003] The methods for preparing nanoporous materials include dealloying method, template method, sintering method, layer-by-layer self-assembly technology, etc. Among them, the chemical dealloying method is a chemical corrosion process. In the solution, the more active elements in the alloy undergo corrosion and dissolution, and the inert elements diffuse and reorganize to form a nanoporous structure. The dealloying method is low in cost, si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/92H01M4/88B82Y30/00
CPCB82Y30/00H01M4/8825H01M4/9041H01M4/921Y02E60/50
Inventor 李雪卢公昊郑继波宁佳林黎曦宁刘瑜
Owner UNIV OF SCI & TECH LIAONING
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