Preparation for gold electrode with nano-pore structure by electrochemistry alloying/dealloying method

A nanoporous structure and electrochemical technology, applied in the direction of material electrochemical variables, electrodes, electrode shape/type, etc., can solve the problems of harsh process conditions and high cost, and achieve the effect of increasing specific surface area, low cost and simple operation

Inactive Publication Date: 2008-01-16
HUAZHONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the method of Sun et al. can directly obtain nanoporous gold film on the surface of the gold electrode, the whole operation process is carried out in ionic liquid,

Method used

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  • Preparation for gold electrode with nano-pore structure by electrochemistry alloying/dealloying method
  • Preparation for gold electrode with nano-pore structure by electrochemistry alloying/dealloying method
  • Preparation for gold electrode with nano-pore structure by electrochemistry alloying/dealloying method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Electrochemical alloying / dealloying prepares a gold electrode with a nanoporous structure, and the preparation steps are:

[0032] Step 1, adding zinc chloride in 50 milliliters of benzyl alcohol, the content of configuration zinc ion is the benzyl alcohol solution of 2.0 mol / liter;

[0033] Step 2, insert a gold electrode into the solution configured in step 1 as the working electrode, the zinc sheet as the auxiliary electrode, and the platinum sheet as the reference electrode;

[0034] Step 3, utilize oil bath to heat the benzyl alcohol containing zinc chloride, its temperature is controlled at 80 ℃;

[0035] Step 4. Use the electrochemical workstation to apply a cyclic potential linear scan to the gold electrode, wherein a single potential linear scan is as follows: the cathode potential scan range is 0 volts→-0.5 volts→0 volts, and the scan speed range is 10 mV / s. The potential scanning range is 0 volts → 0.2 volts → 0 volts; repeat the above potential linear scann...

Embodiment 2

[0038] Electrochemical alloying / dealloying prepares a gold electrode with a nanoporous structure, and the preparation steps are:

[0039] Step 1, adding zinc sulfate in 50 milliliters of benzyl alcohol, the content of configuration zinc ion is the benzyl alcohol solution of 1.0 mol / liter;

[0040] Step 2, insert a gold electrode into the solution configured in step 1 as the working electrode, the zinc sheet as the auxiliary electrode, and the platinum sheet as the reference electrode;

[0041] Step 3, utilize oil bath to heat the benzyl alcohol containing zinc sulfate, and its temperature is controlled at 120 ℃;

[0042] Step 4. Use the electrochemical workstation to apply a cyclic potential linear scan to the gold electrode, wherein a single potential linear scan is as follows: the cathode potential scan range is 0 volts→-2.0 volts→0 volts, the scan speed range is 500 mV / s, and the anode potential scan range is 500 mV / s. The potential scanning range is 0 volts → 1.5 volts → ...

Embodiment 3

[0045] Electrochemical alloying / dealloying prepares a gold electrode with a nanoporous structure, and the preparation steps are:

[0046] Step 1, in 50 milliliters of N, N-dimethylformamide, add zinc chloride, the content of configuration zinc ion is the benzyl alcohol solution of 4.0 mol / liter;

[0047] Step 2, insert a gold electrode into the solution configured in step 1 as the working electrode, the zinc sheet as the auxiliary electrode, and the gold wire as the reference electrode;

[0048] Step 3, utilize oil bath to heat the benzyl alcohol containing zinc chloride, its temperature is controlled at 100 ℃;

[0049] Step 4, use the electrochemical workstation to apply a cyclic potential linear scan to the gold electrode, wherein a single potential linear scan is: the cathode potential scan range is 0 volts→-1.2 volts→0 volts, the scan speed range is 500 mV / s, and the anode potential scan range is 0 volts→-1.2 volts→0 volts. The potential scanning range is 0 volts → 0.6 vo...

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Abstract

A method for preparing metallic electrode with nano-pore structure by electrochemical alloying/dealloying process is provided. The method comprises: firstly adding a zinc salt into an organic solvent and heating to allow dissolution; then inserting a metallic electrode as working electrode, a zinc sheet as auxiliary electrode and an inert metal as reference electrode; electrochemically applying a circulatory potential scanning, wherein a Zn coating is formed on the surface of Au substrate during cathode potential scanning, and the deposited Zn reacts with Au substrate to form Zn-Au alloy with the solution temperature rise during the electrogalvanizing; and finally dissolving Zn from the alloy by the anode potential scanning and dealloying. The method can produce the metallic electrode with nano-pore structure, which has extremely-high roughness after treatment, substantially increase the effective response area of metallic electrode, and greatly improve the sensitivity and catalytic efficiency of metallic electrode in application. The invention has the advantages of simple operation, easily-accessible raw material, low cost, no toxicity, and no environmental pollution; and is used in analysis, catalysis and sensor fields.

Description

technical field [0001] The invention relates to an electrochemical alloying / dealloying method for preparing a gold electrode with a nanopore structure. Background technique [0002] Gold electrode materials are widely used in the field of analysis and catalysis. In order to improve its sensitivity and catalytic efficiency, it is more effective to increase its surface area. At present, many studies are limited to the method of modifying nano-gold particles on the electrode surface. The effect of surface area is not significant. The dealloying method can form a porous structure on the metal surface, fundamentally improving the effective response area of ​​the gold electrode, which has important research significance for expanding the application field of the gold electrode. [0003] In the research on improving gold electrode materials for analysis, the method of modifying the electrode surface with gold nanoparticles is often adopted [Wang, L.; Bai, J.Y.; Huang, P.F. Wang, H...

Claims

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Application Information

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IPC IPC(8): C25B11/03C25B11/08G01N27/30
Inventor 张礼知余传芳贾法龙艾智慧
Owner HUAZHONG NORMAL UNIV
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