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Method for preparing needle-shaped silver for electrodes by electrolytic process

A technology for preparing electrodes and electrolysis, which is applied in chemical instruments and methods, crystal growth, solutions from normal temperature liquid solvents, etc., can solve problems such as contact inclusions and pollution, no needle-like silver reports and literature, etc.

Active Publication Date: 2015-02-11
峨嵋半导体材料研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If ordinary pure silver is used to prepare needle-shaped silver for probes or electrodes of detection equipment, machining is required, and needle-shaped silver is small, and mechanical processing is prone to contact inclusions and pollution
[0003] The acicular silver used in my country currently relies on foreign imports, and there are no relevant reports and documents related to acicular silver in the prior art

Method used

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  • Method for preparing needle-shaped silver for electrodes by electrolytic process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] 1. A method for electrolytic preparation of acicular silver for electrodes, the method comprising the steps of:

[0090] 1) Silver nitrate preparation

[0091] Add Ag material with a purity of 4N into the container, then add dilute nitric acid with a purity not lower than that of high-grade pure, heat to 40°C to slowly dissolve the Ag material, concentrate to remove excess nitric acid, cool and crystallize and purify to obtain pure silver nitrate;

[0092] (2) Preparation of electrolyte

[0093] Add the pure silver nitrate obtained in the above steps to high-purity deionized water, and add high-grade pure HNO 3 , made into silver nitrate electrolyte, so that the Ag in the prepared silver nitrate electrolyte ＋ for 　 0.28 mol / L, NO 3 - The concentration of the solution is 0.4 mol / L, and the prepared electrolyte is put into the electrolytic cell;

[0094] (3) Cast silver anode plate

[0095] (31) Soak the graphite mold in aqua regia and hydrochloric acid respectivel...

Embodiment 2

[0116] 1. A method for electrolytic preparation of acicular silver for electrodes, the method comprising the steps of:

[0117] 1) Silver nitrate preparation

[0118] Add Ag material with a purity of 6N into the container, then add dilute nitric acid with a purity not lower than that of high-grade pure, heat to 80°C to slowly dissolve the Ag material, concentrate to remove excess nitric acid, cool and crystallize for purification, and obtain pure silver nitrate;

[0119] (2) Preparation of electrolyte

[0120] Add the pure silver nitrate obtained in the above steps to high-purity deionized water, and add high-grade pure HNO 3 , made into silver nitrate electrolyte, so that the Ag in the prepared silver nitrate electrolyte ＋ 0.55 mol / L, NO 3 - The concentration of the solution is 0.63 mol / L, and the prepared electrolyte is put into the electrolytic cell;

[0121] (3) Cast silver anode plate

[0122] (31) Soak the graphite mold in aqua regia and hydrochloric acid respectiv...

Embodiment 3

[0143] 1. A method for electrolytic preparation of acicular silver for electrodes, the method comprising the steps of:

[0144] 1) Silver nitrate preparation

[0145] Add Ag material with a purity of 5N into the container, then add dilute nitric acid with a purity not lower than that of high-grade pure, heat to 60°C to slowly dissolve the Ag material, concentrate to remove excess nitric acid, cool and crystallize and purify to obtain pure silver nitrate;

[0146] (2) Preparation of electrolyte

[0147] Add the pure silver nitrate obtained in the above steps to high-purity deionized water, and add high-grade pure HNO 3 , made into silver nitrate electrolyte, so that the Ag in the prepared silver nitrate electrolyte ＋ for 　 0.35 mol / L, NO 3 - The concentration is 0.5mol / L, and the prepared electrolyte is put into the electrolytic cell;

[0148] (3) Cast silver anode plate

[0149] (31) Soak the graphite mold in aqua regia and hydrochloric acid respectively, then boil it t...

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Abstract

The invention discloses a method for preparing needle-shaped silver for electrodes by an electrolytic process. The method includes steps of 1), preparing silver nitrate; 2), preparing electrolyte; 3), casting a silver anode plate; 4), feeding the silver anode plate into an electrolytic tank; 5), measuring the concentration of silver ions and acidity; 6), starting electrolysis; 7), obtaining needle-shaped silver products; and 8), soaking the withdrawn needle-shaped silver in high-purity water. The purification and electrochemical processing technology is adopted in method, and the method has the advantages that proper technological parameters such as the concentration of the silver ions, the acidity, current density and anode-to-cathode distance are set, so that gradient concentration and concentration difference of the silver ions in electrolyte are formed, silver crystals on a cathode continuously extend towards a region with high silver ion concentration from a region with low silver ion concentration while growing, the growing speed of the crystals is higher than the generation speed of new crystal nucleuses and the growth speed of crystal nucleuses, and needle-shaped crystals are obtained. Besides, the prepared needle-shaped silver can be used for probes or electrodes of detection equipment, the purity of the needle-shaped silver is higher than or equal to 4N, the needle-shaped silver can completely replace an imported product, and domestic production requirements are met.

Description

technical field [0001] The invention relates to a method for preparing acicular silver for electrodes by electrolysis. Background technique [0002] The needle-shaped silver used for the probe or electrode of the detection equipment is grown with a silver crystal structure and has a certain geometric shape. The needle-shaped silver has good conductivity and is easy to connect and fix with the equipment. If ordinary pure silver is used to prepare needle-shaped silver for probes or electrodes of detection equipment, mechanical processing is required, and the needle-shaped silver is small, and mechanical processing is prone to contact inclusions and pollution. [0003] The acicular silver used in my country is currently imported from abroad, and there are no relevant reports and documents related to acicular silver in the prior art. According to the electrochemical theory, we have developed an electrolysis method to prepare needle-shaped silver crystals. [0004] When the ele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C5/02C30B29/62C30B7/12
Inventor 詹科种娜陈国忠杨卫东
Owner 峨嵋半导体材料研究所