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# Impregnation of FeCrAl porous metallic support by dipcoating technique for MS-IT-SOFC applications

Imen Elguettari, Aurélie Rolle, Didier Fasquelle

► To cite this version:

Imen Elguettari, Aurélie Rolle, Didier Fasquelle. Impregnation of FeCrAl porous metallic support by dipcoating technique for MS-IT-SOFC applications. 9th International Conference on Fundamentals & Development of Fuel Cells – FDFC2023, Sep 2023, Ulm, Germany. hal-04735070

HAL Id: hal-04735070

https://ulco.hal.science/hal-04735070v1

Submitted on 14 Oct 2024

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## Introduction

Metal-Supported Intermediate-Temperature Solid Oxide Fuel Cells at (MS-IT-SOFCs) have the potential to become a key technology for future energy systems. In this work we demonstrate that sol-gel solutions can be used for the impregnation of FeCrAl supports to avoid the oxidation of the support at high temperature. The goal is clearly to improve the durability of the anodic support, and thus of the fuel cell. This study focuses on the use of (La<sub>0.6</sub>Sr<sub>0.4</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3</sub>), (Ba<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3</sub>), (LaNi<sub>0.6</sub>Fe<sub>0.4</sub>O<sub>3</sub>) and (La<sub>0.75</sub>Sr<sub>0.25</sub>Cr<sub>0.5</sub>Mn<sub>0.5</sub>O<sub>3</sub>) solutions synthesized by the sol-gel method.

The FeCrAl supports were impregnated with sol gel solutions by dip-coating technique to protect the metal fibers of the support from corrosion in the MS-IT-SOFC application at three different temperatures (500 °C, 600 °C and 700 °C).

## Experimental

### Sol-gel synthesis:

<figure><img src="image_2.png" /></figure>

<figure><img src="image_3.png" /></figure>

### Dip-Coating Process:

<figure><img src="image_4.png" /></figure>

<figure><img src="image_5.png" /></figure>

<figure><img src="image_6.png" /></figure>

<figure><img src="image_7.png" /></figure>

1/Dipping

2/Withdrawal

3/Evaporation

* Impregnation of metallic support by dipcoating method into sol-gel solutions (5/10/15 soakings)

## Structural Characterization - XRD

<figure><img src="image_8.png" /><figcaption>FeCrAl support impregnated into LSCF solution at 500°C/600°C/700°C</figcaption></figure>

<figure><img src="image_9.png" /><figcaption>FeCrAl support impregnated into BSCF solution at 500°C/600°C/700°C</figcaption></figure>

<figure><img src="image_10.png" /><figcaption>FeCrAl support impregnated into LNF solution at 500°C/600°C/700°C</figcaption></figure>

<figure><img src="image_11.png" /><figcaption>FeCrAl support impregnated into LSCM solution at 500°C/600°C/700°C</figcaption></figure>

* The coating layer is well crystallised

* Some additional oxides phases

* Phases pure La<sub>0.6</sub>Sr<sub>0.4</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3</sub>, Ba<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3</sub>, LaNi<sub>0.6</sub>Fe<sub>0.4</sub>O<sub>3</sub> and La<sub>0.75</sub>Sr<sub>0.25</sub>Cr<sub>0.5</sub>Mn<sub>0.5</sub>O<sub>3</sub> materials are obtained at different calcination temperatures

## Fuel Cell Elements Concept

<figure><img src="image_12.png" /></figure>

### Objectives:

* Increase the lifetime of a cell by impregnating the metal fibres of our FeCrAl supports by soaking them into sol-gel solutions.

* The objective, which is highly original for the target application, is to coat the micrometric fibres of the support with a very thin layer of oxide compatible with FeCrAl alloy.

* This process aims to protect the FeCrAl support from oxidation at high temperature.

## Morphological Characterization -SEM

<figure><img src="image_13.png" /></figure>

* The best homogen coating quality is observed on the FeCrAl substrate impregnated with LSF and LNF sol-gel solutions

## Electrical Conductivity Measurement

* The conductivity measurement has been performed using four-point approach

* Conductivity values of 50 h thermally treated samples.

<figure><img src="image_14.png" /></figure>

### Van der Pauw method

<figure><img src="image_15.png" /></figure>

* Resistivity of FeCrAl support before coating : 13 .10-3 Ω mm

* Best results are obtained from metallic support FeCrAl impregnated with LSCF and LNF sol gel solutions.

## Conclusion

The results show that the oxide-based coating layer exhibits good adhesion to the supports and improves the resistance to corrosion. In addition, the impregnated metal supports exhibit higher electric conductivity. This approach offers a promising solution for protection against corrosion of metallic support in MS-ITSOFC applications.

This work is financially supported by the Pôle Métropolitain de la Côte d'Opale (PMCO) and the ULCO.