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Research Papers

Densification of Plasma Sprayed SOFC Electrolyte Layer Through Infiltration With Aqueous Nitrate Solution

[+] Author and Article Information
A. Mirahmadi

Department of Mechanical Engineering,  Iran University of Science and Technology, Narmak, Tehran 16844, Iran

K. Valefi1

Department of Mechanical Engineering,  Iran University of Science and Technology, Narmak, Tehran 16844, Irankiavalefi@iust.ac.ir

1

Corresponding author.

J. Fuel Cell Sci. Technol 9(1), 011008 (Dec 19, 2011) (5 pages) doi:10.1115/1.4004503 History: Revised June 29, 2011; Received November 10, 2011; Published December 19, 2011; Online December 19, 2011

Electrolyte of the solid oxide fuel cells deposited by atmospheric plasma spraying of 8 mol.% yttria (8YSZ), is not applicable in as sprayed condition. Optimization of the plasma spraying process parameters or application of feedstock powder, consisting of 8YSZ and 5wt.% alumina improves the problem of gas leakage through electrolyte layer, whereas provides no solution to the problem of electrodes short-circuiting. Infiltration of deposited electrolyte layer with a thin aqueous solution of nitrate precursors of 8YSZ for one time is a solution to high gas permeability; however three infiltration cycles are required to omit the risk of electrodes short circuiting thoroughly.

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Figures

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Figure 1

The schematic diagram of SOFC layers and electrochemical reactions

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Figure 2

The schematic diagram of atmospheric plasma spraying process

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Figure 3

Cross sectional optical image of thermally sprayed Ni layer

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Figure 4

The apparatus for measurement of gas permeability through the layer

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Figure 5

Matrix of circular areas flame sprayed by nickel powder

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Figure 6

Pressure variation in the cavity of gas permeability test apparatus

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Figure 7

Effect of plasma spray parameters on gas permeability coefficient of electrolyte

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Figure 8

Effect of addition of 5 weight % alumina to the 8YSZ plasma spray feedstock

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Figure 9

SEM image of APS deposited electrolyte, (a) before infiltration, (b) after infiltration

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Figure 10

Gas permeability coefficients of as sprayed and infiltrated electrolytes

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Figure 11

Percent of electrical short-circuiting in circular areas of various samples

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