Electrophoretic Deposition and Characterization of the Doped BaCeO3 Barrier Layers on a Supporting Ce0.8Sm0.2O1.9 Solid-State Electrolyte.

Elena Kalinina,Elena Pikalova,Kirill Shubin

doi:10.3390/membranes12030308

Elena Kalinina, Elena Pikalova + Show 1 more

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https://doi.org/10.3390/membranes12030308

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Journal: Membranes	Publication Date: Mar 9, 2022
Citations: 12	License type: CC BY 4.0

Affiliation: Institute of High Temperature Electrochemistry

Abstract

In this study, the technology of electrophoretic deposition (EPD) micrometer barrier layers based on a BaCe0.8Sm0.19Cu0.1O3 (BCSCuO) protonic conductor on dense carrying Ce0.8Sm0.2O1.9 (SDC) solid-state electrolyte substrates is developed. Methods for creating conductive sublayers on non-conductive SDC substrates under EPD conditions, such as the synthesis of a conductive polypyrrole (PPy) layer and deposition of a layer of finely dispersed platinum from a suspension of its powder in isopropanol, are proposed. The kinetics of disaggregation, disperse composition, electrokinetic potential, and the effect of adding iodine to the BCSCuO suspension on these parameters as factors determining the preparation of stable suspensions and successful EPD processes are explored. Button cells based on a carrying SDC electrolyte of 550 μm in thickness with BCSCuO layers (8–35 μm) on the anode, cathode, and anode/cathode side, and Pt electrodes are electrochemically tested. It was found that the effect of blocking the electronic current in the SDC substrate under OCV conditions was maximal for the cells with barrier layers deposited on the anode side. The technology developed in this study can be used to fabricate solid oxide fuel cells with doped CeO2 electrolyte membranes characterized by mixed ionic–electronic conductivity (MIEC) under reducing atmospheres.

Highlights

Barrier layers are widely used in the technology of solid oxide fuel cells (SOFCs) to prevent the interaction of the individual functional layers of SOFCs, to protect electrode layers from phase decomposition and poisoning, and to increase the SOFC energy efficiency by blocking the electron current in devices with electrolyte membranes possessing mixed conductivity (MIECs) [1–5]
In our recent work [57], we proposed a method for the successful electrophoretic deposition (EPD) of electrolyte films on a non-conductive NiO–SDC anode substrate by creating on its surface a conductive sublayer by dropping the suspension of finely dispersed platinum
A comprehensive study was carried out on the formation of barrier layers based on Sm and Cu-doped BaCeO3 (BCSCuO) on an SDC-supporting electrolyte by electrophoretic deposition

Summary

Introduction

Barrier layers are widely used in the technology of solid oxide fuel cells (SOFCs) to prevent the interaction of the individual functional layers of SOFCs, to protect electrode layers from phase decomposition and poisoning, and to increase the SOFC energy efficiency by blocking the electron current in devices with electrolyte membranes possessing mixed conductivity (MIECs) [1–5]. Prospective cathode materials with high mixed electronic–ionic conductivity with a perovskite or perovskite-like structure, such as lanthanum–strontium manganites and cobaltite–ferrites, layered nickelates of rare earth metals (La, Pr, or Nd), and various double perovskites are incompatible with conventional electrolyte materials based on ZrO2 or LaGaO3 due to the diffusion of cations and the resulting chemical interaction at the electrode–electrolyte interface which causes an increase in polarization resistance and can lead to the delamination of the cathode layer [6–8] This problem is solved by the formation of barrier layers between the main electrolyte layer (such as, for example, yttria-doped zirconia (YSZ)) and the cathode.

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