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Research Papers

Ternary Alkali Carbonates Effect on Electrochemical Characterization of Nanocomposite Calcium-Doped Ceria Electrolytes (LNK-CDC) for SOFC

[+] Author and Article Information
Zohaib Ur Rehman

Department of Physics,
COMSATS University Islamabad, Lahore Campus,
Lahore 54000, Pakistan
e-mail: zur626@gmail.com

Ghazanfar Abbas

Department of Physics,
COMSATS University Islamabad, Lahore Campus,
Lahore 54000, Pakistan
e-mail: mian_ghazanfar@hotmail.com

M. Ashfaq Ahmad

Department of Physics,
COMSATS University Islamabad, Lahore Campus,
Lahore 54000, Pakistan
e-mail: maahmad@ciitlahore.edu.pk

Rizwan Raza

Department of Physics,
COMSATS University Islamabad, Lahore Campus,
Lahore 54000, Pakistan
e-mail: razahussaini1980@yahoo.com

M. Ajmal Khan

Department of Physics,
COMSATS University Islamabad, Lahore Campus,
Lahore 54000, Pakistan
e-mail: ajmalkhan@cuilahore.edu.pk

Rida Batool

Department of Environmental Sciences,
Fatima Jinnah Women University,
Rawalpindi 46000, Pakistan
e-mail: deebajzaidi@gmail.com

Faizah Altaf

Department of Environmental Sciences,
Fatima Jinnah Women University,
Rawalpindi 46000, Pakistan
e-mail: faizahaltaf@gmail.com

Rohama Gill

Department of Environmental Sciences,
Fatima Jinnah Women University,
Rawalpindi 46000, Pakistan
e-mail: rohama_gill@hotmail.com

Fida Hussain

Department of Electrical Engineering,
COMSATS University Islamabad,
Islamabad 44000, Pakistan
e-mail: fidahamdards@gmail.com

1Corresponding author.

Manuscript received September 12, 2018; final manuscript received April 3, 2019; published online May 9, 2019. Assoc. Editor: Nianqiang Wu.

J. Electrochem. En. Conv. Stor. 17(1), 011001 (May 09, 2019) (8 pages) Paper No: JEECS-18-1098; doi: 10.1115/1.4043490 History: Received September 12, 2018; Accepted April 06, 2019

The entire world is facing a great shortfall in the energy supply due to the high consumption rate of fossil fuel-based energy resources. Solid oxide fuel cells (SOFCs) are the best alternative energy devices, which convert hydrogen fuel directly into electricity. Alkali carbonated calcium-doped ceria electrolytes (LNK-CDC) as (Ce0.8 Ca0.2), (Ce0.7 Ca0.3), and (Ce0.6 Ca0.4) were synthesized by the co-precipitation method. With the addition of alkali carbonate, nanocomposites of ceria are well preserved after sintering at 600–700 °C. The structural and morphological properties were examined by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. Crystallite sizes were found in the range of 50–80 nm. The maximum ionic conductivity of LNK-CDC (Ce0.8Ca0.2) was achieved to be 0.14 S/cm at 650 °C for anion vacancy migration by the dense microstructure. The minimum activation energy was determined to be 0.23 eV. The Fourier-transform infrared spectroscopy (FTIR) spectra of the prepared materials show the absorbance of IR and their behavior. The maximum power density of symmetric fuel cells LNK-CDC sandwiched with LNCZ oxide electrodes was recorded as 0.52 W cm−2 at 650 °C in the presence of hydrogen (fuel). It is suggested that coating of the equal molar ratio of ternary alkali metals on ceria doped comparatively enhance the performance of new nanocomposite electrolyte for SOFC and other energy applications.

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Figures

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Fig. 1

Synthesis flowchart of LNK-CDC electrolytes using the co-precipitation technique

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Fig. 2

(a) Crystallographic patterns of LNK-CDC electrolytes sintered at 700 °C and (b) crystallographic cubic fluorite structure of LNK-CDC electrolytes

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Fig. 3

(a) SEM micrograph of LNK-CDC1 electrolyte material, (b) SEM micrograph of LNK-CDC2 electrolyte material, and (c) SEM micrograph of LNK-CDC3 electrolyte material

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Fig. 4

FTIR spectra of LNK-CDC (1–3) electrolytes

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Fig. 5

(a) Ionic conductivity measurements of CDC and LNK-CDC electrolytes in the temperature range of 300–650 °C, (b) crystallite size-dependent ionic conductivity and power density comparison, and (c) Arrhenius plots of LNK-CDC (1–3) electrolytes for the measurement of activation energies in air atmosphere along with linear fit data in the inset

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Fig. 6

(a) Fuel cell performance of the symmetric cell using LNK-CDC1 electrolyte with LNCZ electrodes, (b) fuel cell performance of the symmetric cell using LNK-CDC2 electrolyte with LNCZ electrodes, and (c) fuel cell performance of the symmetric cell using LNK-CDC3 electrolyte with LNCZ electrodes

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