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Preparation method of self-supporting nanometer porous silver electrode

A nanoporous silver, self-supporting technology, applied in nanotechnology, nanotechnology, nanotechnology and other directions for materials and surface science, can solve the problem of high process energy consumption, achieve low energy consumption, reduce energy consumption, oxygen reduction Activity enhancing effect

Inactive Publication Date: 2019-01-25
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process of this method is simple, but the oxidation and reduction of silver require the application of voltage, and the energy consumption of the process is high. It is urgent to invent a method for preparing nanoporous metals with low energy consumption.

Method used

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  • Preparation method of self-supporting nanometer porous silver electrode
  • Preparation method of self-supporting nanometer porous silver electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] After polishing the Ag electrode with a diameter of 5 mm to the mirror surface with 50 nm alumina abrasive, the surface of the electrode was cleaned with deionized water, and then ultrasonicated in ethanol and ultrapure water for 15 s, respectively. Put the polished Ag electrode into the solution containing 10mM Cu 2+ Sodium chloride electrolyte, rinse with water after soaking for 10 minutes. The soaked Ag electrode is used as the working electrode, the Pt wire is used as the counter electrode, and the Hg / HgO is used as the reference electrode. The electrolyte is 0.1M NaOH. -1 Carry out cyclic voltammetry scan (20 circles) at the scan rate of 1000°C, electrochemically reduce the electrode to generate nanoporous silver, and carry out electron microscope scanning to the Ag electrode after reduction, the result is as follows figure 1 shown.

[0022] The ORR polarization curve was tested at an electrode rotation speed of 1600rpm, and the ORR half-wave potential was 0.672V...

Embodiment 2

[0024] After polishing the Ag electrode with a diameter of 5 mm to the mirror surface with 50 nm alumina abrasive, the surface of the electrode was cleaned with deionized water, and then ultrasonicated in ethanol and ultrapure water for 15 s, respectively. Put the polished Ag electrode into the solution containing 0.1M Fe 3+ Sodium chloride electrolyte, rinse with water after soaking for 10 minutes. The soaked Ag electrode is used as the working electrode, the Pt wire is used as the counter electrode, and the Hg / HgO is used as the reference electrode. The electrolyte is 0.1M NaOH. -1 Cyclic voltammetry scanning (20 circles) is carried out at the scanning speed, and the electrode is electrochemically reduced to generate nanoporous silver.

[0025] The ORR polarization curve was tested at an electrode rotation speed of 1600rpm, and the ORR half-wave potential was 0.732V, which was 60mV higher than that of the initial Ag electrode, as shown in figure 2 shown.

Embodiment 3

[0027] The Ag wires with a diameter of 0.5 mm were placed in deionized water and acetone and ultrasonically cleaned for 30 min, and then the surface of the Ag wires was cleaned with deionized water. Put the ultrasonically treated Ag wire into 0.1M Cu 2+ Potassium chloride electrolyte solution, rinse with water after soaking for 10 minutes. The soaked Ag wire is used as the working electrode, the Pt wire is used as the counter electrode, and the Hg / HgO is used as the reference electrode. The electrolyte is 0.1M NaOH. -1 A cyclic voltammetry scan (20 circles) was carried out at a scan rate of 100%, and the electrode was electrochemically reduced to generate nanoporous silver.

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Abstract

The invention provides a nanometer porous silver preparation method, which comprises: immersing a solid material at least containing silver on the surface into a liquid electrolytic solution containing transition metal ion and a metal chloride, wherein the solid material is used as precursor; promoting the silver surface to spontaneously form silver chloride by using the transition metal cation through a micro battery reaction; and carrying out electrical reduction to form nanometer porous silver. The invention further provides a preparation method of a self-supporting nanometer porous silverelectrode, wherein the self-supporting nanometer porous silver electrode is prepared by using a silver electrode as a precursor through the method. Compared with the nanometer porous silver in the prior art, the nanometer porous silver of the present invention has the following characteristics that the silver surface spontaneously form the silver chloride by using the transition metal cation through the micro battery reaction, and the electrical reduction is performed to form the nanometer porous silver, such that the oxygen reduction activity is significantly improved compared with the original silver electrode. Compared with the method in the prior art, the method of the present invention eliminates the energy consumption process for applying voltage to the silver electrode to form AgClso as to reduce the energy consumption, and further has advantages of simpleness, strong controllability and the like.

Description

technical field [0001] The invention belongs to the field of nanomaterial preparation, and in particular relates to a self-supporting nanoporous silver and a preparation method of a self-supporting nanoporous silver electrode. Background technique [0002] Compared with precious metals such as Pt and Pd, silver (Ag) has the advantages of abundant resources and low price. As a catalyst, Ag is suitable for many reactions, such as: oxygen reduction reaction (ORR), carbon dioxide electroreduction reaction (CO 2 RR), hydrogenation reaction, etc., all have good catalytic activity. Ag has been studied as an ORR electrocatalyst for more than 60 years. Since the 1980s, alkaline fuel cells have been difficult to solve due to their high cost and unavoidable carbonation in practical applications, which has led to a reduction in research work on alkaline fuel cells, thus making The research on Ag-based ORR electrocatalysts has also decreased significantly. However, in recent years, Ag...

Claims

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Application Information

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IPC IPC(8): B01J23/50B01J35/10B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00B01J23/50B01J35/61
Inventor 姜鲁华李晓克刘静
Owner QINGDAO UNIV OF SCI & TECH
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