Iridium tin oxide gradient composite coating electrode and preparation method thereof

A composite coating and oxide technology, which is applied in the direction of electrodes, coatings, and metal material coating processes, can solve the problems of poor electrode stability and short service life, and achieve less surface cracks, long service life, and easy design Effect

Active Publication Date: 2020-11-27
INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide an iridium-tin oxide gradient composite coating electrode and its preparation method. The obtained electrode has good stability and long service life, which solves the problems of poor stability and short service life of electrodes in the prior art.

Method used

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  • Iridium tin oxide gradient composite coating electrode and preparation method thereof
  • Iridium tin oxide gradient composite coating electrode and preparation method thereof
  • Iridium tin oxide gradient composite coating electrode and preparation method thereof

Examples

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Embodiment 1

[0030] A kind of iridium tin oxide gradient composite coating electrode, is made up of pure titanium substrate, connection layer, transition layer and catalytic layer; Described connection layer chemical composition is Ir 0.1 sn 0.8 Ti 0.1 o 2 , with a thickness of 2 μm; the chemical composition of the transition layer is Ir 0.2 sn 0.8 o 2 , with a thickness of 3 μm; the chemical composition of the catalytic layer is Ir 0.3 sn 0.7 o 2 , with a thickness of 10 μm.

[0031] The preparation method comprises the following steps:

[0032] The pure titanium sheet TA2 is selected as the substrate, etched with 10% (mass fraction) oxalic acid at 90°C for 3 hours, washed with water and then dried by infrared.

[0033] According to the iridium-tin-titanium molar ratio of 1:8:1, chloroiridic acid, tin alkoxide and butyl titanate were dissolved in ethanol-n-butanol mixed solvent with a volume ratio of 1:1 to obtain the total metal molar concentration It is 0.20mol / L coating solut...

Embodiment 2

[0043] A kind of iridium tin oxide gradient composite coating electrode, is made up of pure titanium substrate, connection layer, transition layer and catalytic layer; Described connection layer chemical composition is Ir 0.05 sn 0.85 Ti 0.1 o 2 , with a thickness of 1.5 μm; the chemical composition of the transition layer is Ir 0.15 sn 0.85 o 2 , with a thickness of 3 μm; the chemical composition of the catalytic layer is Ir 0.4 sn 0.6 o 2 , with a thickness of 8 μm.

[0044] The preparation method comprises the following steps:

[0045] Select pure titanium mesh TA2 as the substrate, etch with 8% (mass fraction) oxalic acid at 85°C for 4 hours, wash with water and then dry by infrared.

[0046] According to the molar ratio of iridium tin titanium metal 0.5:8.5:1, chloroiridic acid, tin acetate and butyl titanate were dissolved in ethanol-n-butanol mixed solvent with a volume ratio of 1:1 to obtain a total metal molar concentration of 0.30 mol / L coating solution. I...

Embodiment 3

[0055] A kind of iridium tin oxide gradient composite coating electrode, is made up of pure titanium substrate, connection layer, transition layer and catalytic layer; Described connection layer chemical composition is Ir x0.08 sn 0.82 Ti 0.1 o 2 , with a thickness of 3 μm; the chemical composition of the transition layer is Ir 0.13 sn 0.87 o 2 , with a thickness of 4 μm; the chemical composition of the catalytic layer is Ir 0.35 sn 0.65 o 2 , with a thickness of 12 μm.

[0056] The preparation method comprises the following steps:

[0057] The pure titanium sheet TA2 is selected as the substrate, etched with 10% (mass fraction) oxalic acid at 90°C for 3 hours, washed with water and then dried by infrared.

[0058] According to the iridium-tin-titanium molar ratio of 0.8:8.2:1, chloroiridic acid, tin alkoxide and titanium trichloride were dissolved in ethanol-n-butanol mixed solvent with a volume ratio of 1:1 to obtain the total metal molar concentration It is 0.20mo...

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Abstract

The invention discloses an iridium tin oxide gradient composite coating electrode. The electrode comprises a pure titanium substrate, a connecting layer, a transition layer and a catalytic layer. Thechemical composition of the connecting layer is IrxSn<0.9-x>Ti0.1O2, x is larger than 0 and smaller than or equal to 0.1, and the thickness is 1-3 micrometers. The chemical composition of the transition layer is IrySn<1-y>O2, y is larger than 0.1 and smaller than or equal to 0.2, and the thickness is 1-4 micrometers. The chemical composition of the catalystic layer is IrzSn<1-z>O2, z is larger than 0.2 and smaller than or equal to 0.4, and the thickness is 8-15 micrometers. The iridium tin oxide gradient composite coating electrode is compact in coating structure and few and small in surface crack, the phase interface of the pure titanium substrate and the catalytic layer can gradually change in a gradient mode through the connecting layer and the transition layer, the bonding strength ishigher, the chemical stability is high, the service life is long, and the problem that in the prior art, an electrode is poor in stability and short in service life is solved.

Description

Technical field: [0001] The invention relates to the technical field of iridium tin oxide electrodes, in particular to an iridium tin oxide gradient composite coating electrode and a preparation method thereof. Background technique: [0002] Iridium tin oxide electrode is an insoluble electrode coated with iridium tin oxide on the surface of titanium base. It has the advantages of high electrocatalytic activity and high chemical stability. It has great application value in the fields of electroplating, electrolysis and metal recovery. wide attention from the world and industry. The initial iridium tin oxide coating was homogeneous and applied directly on the titanium substrate. Studies have shown that the failure of the iridium tin oxide electrode is partly due to the passivation of the titanium substrate. In order to prolong the service life of the iridium tin oxide electrode, a Pt layer, SnO 2 -Sb 2 o 3 layers etc. At moderate current densities, Pt layers, SnO 2 -Sb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/12C25C7/02C25D17/10C25B11/04C25B11/06
CPCC23C18/1216C23C18/1225C23C18/1241C25C7/02C25D17/10
Inventor 蒋玉思肖方明邵彩茹曹洪杨
Owner INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
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