Solid oxide fuel cell stainless steel bipolar connector and manufacturing method thereof

A solid oxide, bipolar connector technology, applied in the direction of fuel cells, fuel cell parts, final product manufacturing, etc., can solve the problems of insufficient bonding force between the surface modification layer and the substrate, and the surface modification layer is not dense enough. , to achieve the effects of excellent interface compatibility, excellent high temperature oxidation resistance, and good electronic conductivity

Inactive Publication Date: 2015-03-04
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problem that the surface modification layer is not dense enough to prevent further oxidation of the connector, slow down the resistance rise and the volatiliz

Method used

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  • Solid oxide fuel cell stainless steel bipolar connector and manufacturing method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Before electroplating, cut the 430 (containing Cr17%) stainless steel plate into a sample with a size of 2cm×4cm×0.1cm, and punch out the gas flow field on the surface; use dilute sulfuric acid solution, acetone, alcohol, etc. to clean the surface of the sample in sequence To remove impurities such as organic matter on the surface and oxide layers. The cleaned sample is activated by pulse current on the surface of the sample, and the negative current density in the activation process is 6A / dm 2 , the forward current density is 4A / dm 2 , The positive and negative pulse times are 0.1ms and 0.4ms respectively, and the total activation time is 5min. After the sample has been surface activated, the sample is then subjected to pulse electrodeposition of a Co-Ni alloy layer with a forward current density of 3A / dm 2 The negative current density is 2A / dm 2 , the positive and negative pulse time ratio is 1.5:1.0, and the total plating time is 30min. The plating solution used ...

Embodiment 2

[0021] 430 (containing Cr17%) stainless steel is made into the sample of embodiment 1, and the cleaning process and activation process are the same as embodiment 1. After the sample is surface activated, the sample is pulsed electrodeposited Co-Cu alloy layer, the forward current density is 2A / dm 2 The negative current density is 1A / dm 2 , the positive and negative pulse time ratio is 3.0:1.0, and the total pulse electrodeposition time of the sample is 45min. The bath composition is CuSO 4 (0.10mol / L), HBO 3 (0.64mol / L), CoSO 4 (1.20mol / L), C 12 h 25 NaO 4 S (0.03mol / L), the pH value of the plating solution was adjusted to pH=3.0 by dilute sulfuric acid (4mol / L). The bath temperature was 70°C. Put the electroplated 430 stainless steel into a tube furnace, raise the temperature to 930°C in the air, and keep it warm for 0.5h to get CuCo with spinel structure on the surface. 2 o 4 Coated surface-modified iron-based alloy interconnects for solid oxide fuel cells.

Embodiment 3

[0023]Crofer22AU (containing Cr22%) stainless steel is made the sample of embodiment 1, and cleaning process is the same as embodiment 1; The negative current density of activation process is 3A / dm 2 , the forward current density is 1A / dm 2 , The positive and negative pulse times are 0.2ms and 0.3ms respectively, and the total activation time is 25min. After the sample has been surface activated, the sample is then subjected to pulse electrodeposition of a Co metal layer with a forward current density of 1A / dm 2 The negative current density is 1A / dm 2 , the ratio of positive pulse time to negative pulse time is 3.0:1.0, and the pulse electrodeposition time of the sample is 30min. The bath composition is CoSO 4 (0.80mol / L), HBO 3 (0.02mol / L), C 12 h 25 NaO 4 S (0.2mol / L), the pH value of the plating solution was adjusted to pH=4.5 by dilute sulfuric acid (4mol / L). The bath temperature is 45°C. Put the electrodeposited Crofer22AU stainless steel into a box furnace, rais...

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Abstract

The invention discloses a solid oxide fuel cell stainless steel bipolar connector and a manufacturing method thereof. The iron-based connector comprises a base and a surface modification layer arranged on the surface of the base. The base is a ferrite stainless steel plate with thickness of 0.3-3.0mm and chromium content of 10-30wt%. The surface modification layer is a spinel-structure alloy oxide with thickness of 3-30 microns. The solid oxide fuel cell stainless steel bipolar connector has excellent high temperature oxidation resistance and good electronic conductivity. The manufacturing method has simple processes and realizes compact combination of the spinel oxide modification layer and the base. The solid oxide fuel cell stainless steel bipolar connector has excellent interfacial compatibility, produces modification layer and base synergism and can be massively produced easily.

Description

technical field [0001] The invention relates to a fuel cell connector and a surface modification method thereof, in particular to a solid oxide fuel cell stainless steel bipolar connector and a manufacturing method thereof, belonging to the technical field of fuel cells. Background technique [0002] Solid oxide fuel cells (SOFC) have broad application prospects in distributed small power plants, ships / cars and other vehicles due to their advantages of cleanliness, high efficiency, high power, and quietness. A solid oxide fuel cell is a single cell composed of an anode, a cathode, and an electrolyte, and the voltage of the single cell is below 1.0V. According to the power requirements of practical applications, it is necessary to connect the single cells with connectors to form a battery stack to meet the voltage and current requirements. The connector not only plays the role of distributing fuel gas and oxidant to the battery anode and battery cathode respectively, but als...

Claims

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Application Information

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IPC IPC(8): H01M8/02C25D3/12C25D3/56C25D5/18H01M8/0297
CPCC25D3/12C25D3/56H01M8/0297Y02E60/50Y02P70/50
Inventor 孙俊才程付鹏季世军李嵩文钟晟
Owner DALIAN MARITIME UNIVERSITY
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