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Method for preparing manganese-cobalt composite material by cathodic electrodeposition

A cathodic electrodeposition and composite material technology, which is applied in the direction of electrolytic inorganic material coating, etc., can solve the problems of anode slime generation in large quantities, and achieve the effects of reducing electroplating energy consumption, improving current efficiency, and high oxygen evolution catalytic activity

Active Publication Date: 2019-08-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a method for preparing manganese-cobalt composite materials by cathodic electrodeposition, aiming at solving the technical problem of a large amount of anode slime caused by using platinum as an anode to prepare manganese-cobalt composite materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Preparation of electroplating solution

[0029] Add 0.2 mol of ammonium sulfate and 0.5 mol of sodium gluconate to 1L of deionized water, and after the ammonium sulfate and sodium gluconate are completely dissolved by ultrasonic stirring or glass rod stirring, add 0.5 mol of manganese sulfate monohydrate and 0.1 mol of cobalt sulfate, manganese sulfate monohydrate and cobalt sulfate are dissolved to obtain an electroplating solution, and ammonia or sulfuric acid is added to the electroplating solution until the pH of the electroplating solution is 3.

[0030] Among them, ammonium sulfate is used as a buffering agent, the concentration is 0.1-1mol / L; sodium gluconate is a metal ion chelating agent, the concentration is 0.1-1mol / L; manganese sulfate monohydrate is the sulfate salt introduced with manganese ions, the concentration is 0.3-0.6mol / L; cobalt sulfate is sulfate introduced with cobalt ions, the concentration is 0.05-0.2mol / L.

[0031] In addition to sodium...

Embodiment 2

[0049] (1) Preparation of electroplating solution

[0050] Add 0.4 mol of ammonium sulfate and 0.6 mol of sodium gluconate to 1L of deionized water, and after the ammonium sulfate and sodium gluconate are completely dissolved by ultrasonic stirring or glass rod stirring, add 0.4 mol of manganese sulfate monohydrate and 0.2 mol of cobalt sulfate, manganese sulfate monohydrate and cobalt sulfate are dissolved to obtain an electroplating solution, and ammonia or sulfuric acid is added to the electroplating solution until the pH of the electroplating solution is 3.2.

[0051] (2) Cathode substrate pretreatment

[0052] Use 400-mesh silicon carbide sandpaper, 800-mesh silicon carbide sandpaper, and 1200-mesh silicon carbide sandpaper to polish the stainless steel cathode in the same direction, and finally use 1500-mesh metallographic sandpaper to polish the stainless steel cathode to the mirror surface in the same direction. Place the polished stainless steel plate in absolute eth...

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Abstract

The invention discloses a method for preparing a manganese-cobalt composite material through cathodic electrodeposition. The method comprises the steps that electroplating liquid containing manganeseions and cobalt ions is added into an electroplating bath, a composite anode and a stainless steel cathode are inserted into the electroplating bath, and constant-current electroplating is carried outat indoor temperature for preset time, wherein the composite anode comprises, by mass, 10-30% of tin, 0.1-5% of cobalt and the balance lead. The working procedure of achieving electrodeposition of aMn-Co spinel coating on the stainless steel cathode can be complete in the same electroplating bath, no MnO2 is produced in the electrodeposition process, the influences of MnO2 particles impurities on the performance of the coating are reduced, and consumption of the manganese ions in the electroplating liquid is reduced.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a method for preparing a manganese-cobalt composite material by cathode electrodeposition. Background technique [0002] Manganese-cobalt composites have good thermal stability and electrical conductivity, among which Mn-Co spinel coating is the most widely used, and good electrical conductivity can be obtained by adjusting the ratio of Mn and Co in the composite. Mn-Co spinel coating is considered to be the most promising material for solid oxide fuel cell (SOFC) connector coating. The operating voltage of SOFC is generally lower than 1 volt, and it is necessary to use connector materials to connect single cells in series. to form a battery stack. Connector is a key part of SOFC. At present, the material used as connector is mainly ferrite alloy. The operating temperature of solid oxide fuel cells is relatively high (usually higher than 800°C). If the surface of the co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D9/06
CPCC25D9/06
Inventor 蒋良兴杨凡刘芳洋赖延清李劼
Owner CENT SOUTH UNIV
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