A kind of graded porous silver and preparation method thereof

A technology of hierarchical pores and secondary pores, applied in the direction of nanotechnology, can solve the problems of difficult industrial production, single silver pore structure, and difficulty in control, and achieve low production cost, controllable pore size and porosity distribution, and easy implementation Effect

Active Publication Date: 2018-11-27
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Template method, the process is relatively complicated, the cost is high, and it is difficult to realize industrial production. At the same time, the pore structure of silver prepared by the above method is single and difficult to control.

Method used

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  • A kind of graded porous silver and preparation method thereof
  • A kind of graded porous silver and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: configuration contains the solution of 0.005M NaCl and 0.1M NaOH and it is used as electrolytic solution, and the silver lump electrode that diameter is 5mm is as working electrode, and platinum sheet is counter electrode, and mercury / mercuric oxide electrode is reference electrode, Electrochemical treatment at 1.0V (relative to the reversible hydrogen electrode) for 2h followed by electrochemical reduction in 0.1M NaOH electrolyte at 0.15V (relative to the reversible hydrogen electrode) for 5min to obtain porous silver.

Embodiment 2

[0023] Embodiment 2: configuration contains the solution of 0.001mM NaCl and it is used as electrolyte, with silver sheet as working electrode, graphite rod is counter electrode, and silver / silver chloride electrode is reference electrode, at 1.5V (relative to reversible hydrogen electrode) under electrochemical treatment for 100 h, and then irradiated under strong light of 200,000 lux for 1 h to obtain porous silver.

Embodiment 3

[0024] Embodiment 3: configure the solution containing 2M NaCl and 0.1M HCl and use it as electrolyte, use silver rod as working electrode, silver sheet as counter electrode, saturated calomel electrode as reference electrode, electrochemical treatment at 5.0V After 360s, copper target X-rays were irradiated for 1h to obtain porous silver.

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Abstract

The invention relates to a method for preparing hierarchical porous silver, in particular to a method for preparing silver halide electrochemically by using silver with any structure as a precursor, and then reducing and preparing hierarchical porous silver under certain conditions. Compared with the prior art, the hierarchical porous silver of the present invention is composed of primary pores formed by the aggregation of silver nanoparticles and secondary pores formed by the interconnection of silver nano-aggregates; and the primary pores and secondary pores are evenly distributed, The difference in pore size is significant, which is helpful for its mass transfer reaction when it is used as an oxidation source catalyst and other special field applications. The preparation method of the hierarchical porous silver of the present invention has the advantages of environmental protection, convenience, easy implementation, low production cost, controllable pore diameter and porosity distribution of the hierarchical porous silver during the preparation process, and the like. When it is used as an oxidation source electrocatalyst, the oxygen reduction catalytic activity per unit mass of silver catalyst is greatly improved.

Description

technical field [0001] The invention belongs to the field of nanometer material preparation, and in particular relates to a hierarchical porous silver and a preparation method thereof. Background technique [0002] Nanoporous metals are a new class of nanostructured materials developed this year. Because of their large specific surface area, low density, flexible and adjustable structure, and good permeability, porous materials are widely used in separation, catalysis, and transmission. Induction, medicine, electrodes, machinery and other fields. Due to its excellent physical and chemical properties, porous silver has broad application prospects in the fields of catalyst materials, electronic ceramic materials, antistatic materials, and biosensor materials. [0003] A common method for preparing porous metals is the dealloying method and the templating method. The dealloying method generally uses special alloys as raw materials. The alloys are usually prepared by metallurg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B82Y40/00
Inventor 孙公权袁丽只姜鲁华
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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