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Double-layer coating on metal connector surface of high-temperature solid oxide cell and preparation method thereof

A metal connector and double-layer coating technology, which is applied in the direction of solid electrolyte fuel cells, battery pack components, fuel cell components, etc., can solve the problem of destroying the stability of perovskite oxides and the second coating is not dense , contact layer resistance increase and other issues, to achieve the effect of easy amplification and large-scale manufacturing, low surface specific resistance, and avoid oxidation

Inactive Publication Date: 2014-04-23
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the second coating made of metal connected to the connecting piece is prepared by plasma spraying method, the manufacturing cost is relatively high, and it is easy to cause the second coating to be not dense. The chromium will volatilize through the pores of the second coating and react with the perovskite oxide in the current collector layer and the first coating to form SrCrO 4 , thus destroying the stability of these perovskite oxides, resulting in a gradual increase in the resistance of the contact layer

Method used

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  • Double-layer coating on metal connector surface of high-temperature solid oxide cell and preparation method thereof
  • Double-layer coating on metal connector surface of high-temperature solid oxide cell and preparation method thereof
  • Double-layer coating on metal connector surface of high-temperature solid oxide cell and preparation method thereof

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Embodiment 1

[0050] This embodiment relates to a double-layer coating on the surface of a metal connector of a high-temperature solid oxide battery and a preparation method; the structure of the double-layer coating is as follows figure 1 As shown, it includes a first coating 2 on the base layer 1 of the metal connector, and a second coating 3 deposited on the first coating 2 . In this embodiment, SUS430 ferritic stainless steel with a chromium content of 16.0-18.0% is used as the metal substrate, and the specific preparation steps are as follows:

[0051] The first step is to electroplate pure cobalt on the surface of SUS430 ferritic stainless steel:

[0052] 1. After cutting the SUS430 stainless steel plate according to the required size, polish it with 350-mesh, 1200-mesh and 2000-mesh SiC water abrasive paper in turn until it is bright, use chemical degreasing method to degrease initially, and then soak in acetone solution for ultrasonic cleaning for 30 minutes , and finally activated...

Embodiment 2

[0066] In this embodiment, Crofer22APU ferritic stainless steel with a chromium content of 22.0-24.0% is used as the metal matrix. Electroplating cobalt-based composite coating (particles are LaCrO 3 ) as the first coat. Doped with Ce 0.8 SM 0.2 O 2-δ The double perovskite structure composite oxide PrBaCo 2 O 5+δ as a second coat. Concrete preparation steps are as follows:

[0067] The first step is to electroplate cobalt-based composite coating on the surface of Crofer22APU ferritic stainless steel:

[0068] 1. After cutting the Crofer22APU stainless steel plate according to the required size, polish it with 350-mesh, 1200-mesh and 2000-mesh SiC water abrasive paper in turn until it is bright, use chemical degreasing method to degrease, and then soak in acetone solution for ultrasonic cleaning for 30 minutes , and finally activated with a mixed solution of 5% nitric acid and 15% hydrochloric acid for 1 minute, rinsed with distilled water, and dried for later use.

[...

Embodiment 3

[0078] In this embodiment, E-brite ferritic stainless steel with a chromium content of 26.0-27.5% is used as the metal matrix. An electroplated cobalt-iron alloy coating is used as the first coating. Doped with Ce 0.75 Y 0.25 O 2-δ K 2 NiF 4 type structure composite oxide Nd 2 NiO 4+δ as a second coat. Concrete preparation steps are as follows:

[0079] The first step is to electroplate cobalt-iron alloy coating on the surface of E-brite ferritic stainless steel:

[0080] 1. After cutting the E-brite stainless steel plate according to the required size, polish it with 350-mesh, 1200-mesh and 2000-mesh SiC water abrasive paper in turn until it is bright, use chemical degreasing method to degrease initially, and then immerse in acetone solution for ultrasonic cleaning 30 minutes, and finally activated with a mixed solution of 5% nitric acid and 15% hydrochloric acid for 1 minute, rinsed with distilled water, and dried for later use.

[0081] 2. Prepare the basic platin...

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Abstract

The invention discloses a double-layer coating on the metal connector surface of a high-temperature solid oxide cell and a preparation method of the double-layer coating. The coating comprises a first coating facing the metal connector surface and a second coating facing the environment, wherein the first coating consists of a main-phase oxide spinel structure and a first-phase composite oxide; the second coating consists of a main-phase composite oxide and a second-phase composite oxide. The first coating of the double-layer coating is bonded to a metal connector well and densely; the diffusion of chromium to an SOFC (solid oxide fuel cell) cathode or an SOEC (solid oxide electrolyser cell) anode can be effectively prevented; the main-phase composite oxide powder in the second coating adopts a precursor, high-temperature sintering can be realized in an non-oxidizing atmosphere to avoid excessive oxidation of the metal connector; the second coating is bonded well with the first coating; the phasing of the main-phase oxide composite is realized at low temperature before the cell is operated; high electric conductivity is obtained, and meanwhile, high thermochemical compatibility and low contact resistance between the coating and the SOFC cathode or the SOEC anode are realized.

Description

technical field [0001] The invention belongs to the technical field of high-temperature fuel cell and electrolytic cell materials, and in particular relates to a double-layer coating on the surface of a metal connector of a high-temperature solid oxide battery and a preparation method thereof. Background technique [0002] Solid Oxide Fuel Cell (Solid Oxide Fuel Cell, SOFC) is an all-solid-state power generation device that directly converts the chemical energy in the fuel into electrical energy through an electrochemical reaction. The conversion process has many advantages, among which the outstanding advantage lies in the wide applicability of fuels, and various hydrocarbon fuels such as hydrogen, carbon monoxide, natural gas, liquefied gas, coal gas, biomass gas, methanol and ethanol can be widely used. Solid oxide fuel cells have a wide range of applications. [0003] In recent years, solid oxide electrolysis cell (Solid Oxide Electrolysis Cell, SOEC) has attracted wide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M2/20H01M8/0202H01M50/521H01M50/528
CPCY02E60/50H01M8/12H01M50/531Y02E60/10
Inventor 屠恒勇杨晓龙余晴春
Owner SHANGHAI JIAO TONG UNIV
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