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Research Papers

# Preparation and Characterization of Nanocomposite Calcium Doped Ceria Electrolyte With Alkali Carbonates (NK-CDC) for SOFC

[+] Author and Article Information
Ghazanfar Abbas1

Department of Physics, Bahauddin Zakariya University, Multan, 60800, Pakistan; Department of Physics, COMSATS Institute of Information Technology, Islamabad 44000, Pakistan; Department of Energy Technology, GETT Fuel Cell Laboratory, KTH, Stockholm 100 44, Swedenmian_ghazanfar@hotmail.com

Rizwan Raza

Department of Physics, COMSATS Institute of Information Technology, Lahore 54000, Pakistan; Department of Energy Technology, GETT Fuel Cell Lab, KTH, Stockholm 100 44, Swedenrizwanr@kth.se

M. Ashraf Chaudhry

Department of Physics, Bahauddin Zakariya University, Multan 60800, Pakistanshaifo313@gmail.com

Bin Zhu

Department of Energy Technology, GETT Fuel Cell Laboratory, KTH, Stockholm 100 44, Swedenbinzhu@.kth.se

1

Corresponding author.

J. Fuel Cell Sci. Technol 8(4), 041013 (Apr 01, 2011) (5 pages) doi:10.1115/1.4003635 History: Received October 14, 2010; Revised December 13, 2010; Published April 01, 2011; Online April 01, 2011

## Abstract

The entire world’s challenge is to find out the renewable energy sources due to rapid depletion of fossil fuels because of their high consumption. Solid oxide fuel cells (SOFCs) are believed to be the best alternative source, which converts chemical energy into electricity without combustion. Nanostructure study is required to develop highly ionic conductive electrolytes for SOFCs. In this work, the calcium doped ceria $(Ce0.8Ca0.2O1.9)$ coated with 20% molar ratio of two alkali carbonates (CDC-M: $MCO3$, where $M=Na$ and K) electrolyte was prepared by coprecipitation method. Ni based electrode was used to fabricate the cell by dry pressing technique. The crystal structure and surface morphology were characterized by an X-ray diffractometer, scanning electron microscopy (SEM), and high resolution transmission electron microscopy (TEM). The particle size was calculated in the range 10–20 nm by Scherer’s formula and compared with SEM and TEM results. The ionic conductivity was measured by using ac electrochemical impedance spectroscopy method. The activation energy was also evaluated. The performance of the cell was measured $0.567 W/cm2$ at temperature $550°C$ with hydrogen as a fuel.

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## Figures

Figure 1

XRD pattern of NK-CDC electrolyte sintered at 700°C

Figure 2

SEM image of NK-CDC electrolyte

Figure 3

TEM analysis of NK-CDC: (a) CDC and (b) alkali layer

Figure 4

Ionic conductivity as measured in hydrogen and air atmosphere

Figure 5

(a) Arrhenius curve for measurements of activation energy under hydrogen and air atmosphere, (b) linear fit at hydrogen atmosphere, and (c) linear fit at air atmosphere

Figure 6

Fuel cell performance

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