Effects of (Li-Na)2CO3on The Electrical Properties of Calcia-Stabilized Zirconia/Carbonate Composite Electrolytes

Aiman Iqbal,Hary Devianto,Pramujo Widiatmoko

doi:10.1051/e3sconf/202233404014

Aiman Iqbal, Hary Devianto + Show 1 more

Open Access

https://doi.org/10.1051/e3sconf/202233404014

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Abstract

Calcia-Stabilized Zirconia (CSZ) is potential as low-cost electrolytes material for Solid oxide fuel cell (SOFC). It is fluorite structure widely known as oxygen ion conductors. Addition of carbonate salt into fluorite-based electrolyte is common to overcome low conductivity of CSZ as well as to decrease sintering temperature. Increase of ionic conductivity in the SOFC electrolyte is also influenced by presence of protons (H+), so it is called mixed-ion electrolytes. In this study, the effect of sintering temperature and carbonate content prepared from mixture of Li2CO3and Na2CO3on the relative density, ionic conductivity and microstructure of electrolyte and fuel cell performance was investigated. The sintered CSZ/carbonate samples were examined physically and electrochemically by using SEM, TEM, XRD, and EIS. The unique detail of nanostructure for CSZ/carbonate was investigated by TEM. The XRD is to observed peak associating with CSZ, Li2CO3, and Na2CO3, as well as its crystallinity. Moreover, the electrolyte resistance was measured by EIS so that the proton conductivity and oxygen conductivity of CSZ/carbonate can be calculated. The improvement of low-cost electrolyte material such as CSZ can be realized by providing protons pathway.

Highlights

Fuel cell is an energy conversion device that produces electricity by electrochemical reaction
Fuel cells are classified by electrolyte and temperature consist of polymer electrolyte membrane fuel cells (PEMFC), alkaline fuel cells (AFC), molten carbonate fuel cells (MCFC) and solid oxide fuel cells (SOFC)
Through the review of Calcia-Stabilized Zirconia (CSZ) electrolyte which has a single-phase material, the approach taken is to develop a material with two phases to form a strong interface

Summary

Introduction

Fuel cell is an energy conversion device that produces electricity by electrochemical reaction. The addition of certain aliovalent oxides stabilizes the cubic fluorite structure of ZrO2 from room temperature to its melting point and, at the same time, increases its oxygen vacancy concentration 4. The possible oxygen ion/proton conduction in SDC/carbonate composites and excellent cell performances make them a novel electrolyte for costeffective low-temperature SOFC. Fuel cells with such an electrolyte have delivered attractive power output at low temperature. The effect of sintering temperature and carbonate content prepared from mixture of Li2CO3 and Na2CO3 on the relative density, ionic conductivity and microstructure of electrolyte and fuel cell performance was investigated. CSZ/carbonate samples were examined physically and electrochemically by using SEM, TEM, XRD, and EIS

Methodology

Findings

Result and Discussion