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Method for preparing nanoporous silver by electrodeposition

A technology of nanoporous silver and electrodeposition method, which is applied in the direction of electroforming nanostructure, nanotechnology, electroforming, etc., can solve the problems of gaps in performance and application fields, and can not be obtained, and achieve the effect of expanding performance and application fields

Active Publication Date: 2021-08-31
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this product can be used as a sensitive and reproducible three-dimensional SERS substrate, it has shortcomings and its preparation method. First, the basis of the product is limited to nanoporous gold. Porous silver has excellent cathodic reduction performance - electrocatalytic reduction of carbon dioxide, oxygen reduction reaction at low overpotential, etc., and higher SERS enhancement ability, while nanoporous gold has gaps in the performance and application fields of the above aspects Secondly, even if the preparation method can deposit the gold-silver alloy on the surface of the conductive substrate or the conductive template of the desired shape and size by electrodeposition for molding, and obtain the product in the subsequent dealloying step, the product’s The basis can only be nanoporous gold, but not nanoporous silver

Method used

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  • Method for preparing nanoporous silver by electrodeposition
  • Method for preparing nanoporous silver by electrodeposition
  • Method for preparing nanoporous silver by electrodeposition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The concrete steps of preparation are:

[0041] Step 1, according to the volume ratio of the silver nitrate solution of 20mmol / L and the potassium iodide solution of 5mol / L is the ratio of 0.8:1, the silver nitrate solution is dripped in the potassium iodide solution and vigorously stirred, obtains [AgI 2 ] - complex solution.

[0042] Step 2, according to the volume ratio of the copper nitrate solution of 0.1mol / L, the sodium sulfite solution of 0.7mol / L and the potassium iodide solution of 3mol / L is the ratio of 0.3:0.7:1, mix the former two and drop in the potassium iodide solution and vigorously stirred to obtain [CuI 2 ] - complex solution.

[0043] Step 3, according to [AgI 2 ] - The complexation solution and [CuI 2 ] - The volume ratio of the complex solution is 0.8:1, and the two are mixed to obtain a complex mixed solution.

[0044] Step 4, with silver-silver chloride as the reference electrode, graphite sheet as the counter electrode, conductive subst...

Embodiment 2

[0048] The concrete steps of preparation are:

[0049] Step 1, according to the volume ratio of the silver nitrate solution of 25mmol / L and the potassium iodide solution of 4.5mol / L is the ratio of 0.98:1, the silver nitrate solution is dripped in the potassium iodide solution and vigorously stirred to obtain [AgI 2 ] - complex solution.

[0050] Step 2, according to the volume ratio of the copper nitrate solution of 0.15mol / L, the sodium sulfite solution of 0.65mol / L and the potassium iodide solution of 3.8mol / L is the ratio of 0.35:0.65:1, mix the former two and drop into the potassium iodide solution and vigorously stirred to obtain [CuI 2 ] - complex solution.

[0051] Step 3, according to [AgI 2 ] - The complexation solution and [CuI 2 ] - The volume ratio of the complex solution is 0.98:1, and the two are mixed to obtain a complex mixed solution.

[0052] Step 4, with silver-silver chloride as the reference electrode, the graphite sheet as the counter electrode,...

Embodiment 3

[0056] The concrete steps of preparation are:

[0057] Step 1, according to the volume ratio of the silver nitrate solution of 30mmol / L and the potassium iodide solution of 4mol / L is the ratio of 1.16:1, the silver nitrate solution is dripped in the potassium iodide solution and vigorously stirred, obtains [AgI 2 ] - complex solution.

[0058] Step 2, according to the volume ratio of the copper nitrate solution of 0.2mol / L, the sodium sulfite solution of 0.6mol / L and the potassium iodide solution of 4.5mol / L is the ratio of 0.4:0.6:1, mix the former two and drop into the potassium iodide solution and vigorously stirred to obtain [CuI 2 ] - complex solution.

[0059] Step 3, according to [AgI 2 ] - The complexation solution and [CuI 2 ] - The volume ratio of the complex solution is 1.16:1, and the two are mixed to obtain a complex mixed solution.

[0060] Step 4, with silver-silver chloride as the reference electrode, graphite sheet as the counter electrode, conductive...

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Abstract

The invention discloses a method for preparing nanoporous silver by electrodeposition. It first drops silver nitrate solution into potassium iodide solution and stirs, copper nitrate solution and sodium sulfite solution are mixed, then drops into potassium iodide solution and stirs, and then the obtained [AgI 2 ] ‑ Complexation solution and [CuI 2 ] ‑ After the complex solution is mixed, place silver-silver chloride as a reference electrode, a graphite sheet as a counter electrode, a conductive substrate or a conductive template as a working electrode in the obtained complex mixed solution for electrodeposition, and then, the obtained The silver-copper alloy on the surface of the conductive substrate or the conductive template with the silver-copper alloy are immersed in saturated potassium iodide solution for cleaning, and then the pure silver-copper alloy on the surface of the conductive substrate or the pure silver-copper alloy on the conductive film are immersed in ammonia water and The mixed solution of ethanol is mixed with oxygen, and the nanoporous silver with various shapes and sizes with a pore diameter less than or equal to 20nm can be prepared. Its products are extremely easy to be widely commercialized in the fields of catalysis, sensors, fuel cells and SERS spectral detection.

Description

technical field [0001] The invention relates to a method for preparing nanoporous silver, in particular to a method for preparing nanoporous silver by electrodeposition. Background technique [0002] Nanoporous noble metals with large specific surface areas, as a three-dimensional continuous porous metal structure, are of great significance in the application of various technologies such as catalysis, sensors, fuel cells, and surface-enhanced Raman scattering (SERS) spectroscopy. Recently, people have made some useful attempts and efforts to obtain nanoporous noble metals, such as "GreenSynthesis of Large-Scale Highly Ordered Core@Shell Nanoporous Au@Ag NanorodArrays as Sensitive and Reproducible 3D SERS Substrates", ACS Appl MaterInter, 2014 , 6, 15667 ("Green synthesis of large-area highly ordered Au@Ag core-shell nanorod arrays and used as a sensitive and reproducible three-dimensional SERS substrate", "ACS Applied Materials and Interfaces", No. 6, No. 15667, 2014 page) ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D1/08C25D3/64C25D5/48B82Y40/00C23F1/40
CPCB82Y40/00C23F1/40C25D1/006C25D1/08C25D3/64C25D5/48
Inventor 唐海宾孟国文
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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