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Composite oxide catalytic coating for oxygen evolution electrode and preparation method thereof

Active Publication Date: 2021-06-22
GUANGDONG INST OF RARE METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the content of iridium in the iridium oxide-based coating is higher, such as iridium mass percentage content in the iridium tantalum oxide coating is 60% (Yao Shudian, Shen Jianian, Sun Juan, etc. IrO 2 +Ta 2 o 5 Titanium-based modified coating anode and failure characteristics, Rare Metal Materials and Engineering, 2006,35(12):1916~1919), the mass percentage of iridium in the iridium tin oxide coating is 33% (LASSALIT.A.F, BOODTSJ.FC,BULHOESL.OS.EffectofSn-precursoronthemorphologyandcompositionofIr 0.3 sn 0.7 o 2 Oxidefilmspreparedbysol–gelprocess.Journalof non-crystallinesolides,2000,273(1-3):129~134), resulting in higher cost of iridium oxide-based coated electrodes
Although it is economically feasible to apply in high-speed electroplating and precious metal electroplating, the economic load is relatively large in the electrowinning of heavy metals such as copper and zinc, which limits the application of iridium oxide-based coated electrodes in the field of metal electrowinning.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Select pure titanium sheet TA2 as the substrate, etch with 10% (mass fraction) oxalic acid at 90°C for 3 hours, wash with water, and then dry by infrared to obtain a clean titanium substrate.

[0029] According to the iridium-cobalt-tin molar ratio of 2:1:7, chloroiridic acid, cobalt chloride and tin protochloride are dissolved in ethanol-n-butanol mixed solvent with a volume ratio of 2:1 to obtain a total metal molar concentration of 0.25mol / L coating solution.

[0030] Use a soft brush to evenly paint the coating solution on the titanium substrate, then dry and solidify at 120°C for 8 minutes, then thermally oxidize and decompose at 460°C for 10 minutes, repeat twice, and finally heat treat at 450°C for 0.5h to obtain a low-temperature coating. layer.

[0031] Use a soft brush to evenly paint the coating solution on the titanium-based low-temperature coating, then dry and solidify at 110°C for 10 minutes, then thermally oxidize and decompose at 510°C for 10 minutes, ...

Embodiment 2

[0041] Select pure titanium sheet TA2 as the substrate, etch with 8% (mass fraction) oxalic acid at 95°C for 3 hours, wash with water, and then dry by infrared to obtain a clean titanium substrate.

[0042] According to the molar ratio of iridium-cobalt-titanium metal 1:1:8, iridium trichloride, cobalt acetate and butyl titanate were dissolved in ethanol-n-butanol mixed solvent with a volume ratio of 1:1, and the total metal molar concentration was obtained as 0.3mol / L coating solution.

[0043] Use a soft brush to evenly paint the coating solution on the titanium substrate, then dry and solidify at 110°C for 10 minutes, then thermally oxidize and decompose at 460°C for 10 minutes, air-cool, repeat 3 times, and finally heat-treat at 460°C for 0.5h to obtain low temperature coating.

[0044] Use a soft brush to evenly paint the coating solution on the titanium-based low-temperature coating, then dry and solidify at 110°C for 10 minutes, then thermally oxidize and decompose at ...

Embodiment 3

[0047] Select pure titanium sheet TA2 as the substrate, etch with 10% (mass fraction) oxalic acid at 85°C for 3 hours, wash with water, and then dry by infrared to obtain a clean titanium substrate.

[0048] According to the molar ratio of iridium manganese tin metal 1.5:1.5:7, chloroiridic acid, manganese acetate and stannous chloride are dissolved in ethanol-n-butanol mixed solvent with a volume ratio of 2:1 to obtain a total metal molar concentration of 0.2 mol / L coating solution.

[0049] Use a soft brush to evenly paint the coating solution on the titanium substrate, then dry and solidify at 110°C for 10 minutes, then thermally oxidize and decompose at 450°C for 10 minutes, air-cool, repeat twice, and finally heat-treat at 450°C for 0.5h to obtain low temperature coating.

[0050] Immerse the titanium base coated with low-temperature coating in the coating solution, pull it at 20 μm / s, then dry and solidify at 120°C for 10 minutes, then thermally oxidize and decompose at...

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Abstract

The invention discloses a composite oxide catalytic coating for an oxygen evolution electrode, which is coated on a clean titanium substrate and consists of iridium oxide active components, base metal oxide active components and inert oxide components, and the total mass percentage is Based on 100%, the composition content of the coating is iridium oxide: 8%-34%; base metal oxide: 3%-12%; inert oxide: 67%-86%. By doping the base metal oxide active component, the oxygen evolution catalytic activity is guaranteed while reducing the iridium content and lowering the cost. At the same time, the excessive oxidation of the titanium base is avoided through the prefabricated low-temperature coating, which is environmentally friendly and easy to implement. The design is simple and the process is simple, which is suitable for large-scale production.

Description

Technical field: [0001] The invention relates to a composite oxide catalytic coating for an oxygen evolution electrode and a preparation method thereof. Background technique: [0002] Oxygen evolution reaction is an important electrode reaction in the field of metal electrowinning. The iridium oxide-based coated electrode is an inert electrode made by coating the iridium oxide active ingredient on the titanium-based surface. As an oxygen evolution electrode, the iridium oxide-based coating electrode has the advantages of high electrocatalytic activity and chemical stability, and has great application value in the fields of electroplating, electrolysis, and aluminum foil formation. Usually, the iridium oxide-based coating mainly includes iridium tantalum oxide coating and iridium tin oxide coating. At present, the content of iridium in the iridium oxide-based coating is higher, such as iridium mass percentage content in the iridium tantalum oxide coating is 60% (Yao Shudian...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D17/10C25C7/02
CPCC25C7/02C25D17/10
Inventor 蒋玉思肖方明曹洪杨
Owner GUANGDONG INST OF RARE METALS
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