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Structural and electrochemical investigation on Ga3+ doped Pr1.3Sr0.7Ni0.7Cu0.3O4 + δ cathodes for IT-SOFC applications

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Abstract

The Pr1.3Sr0.7Ni(0.7 − x)Ga x Cu0.3O4 + δ (x = 0.0, 0.02, 0.05, and 0.1) oxides with tetragonal K2NiF4-type crystal structure with I/4mmm symmetry are obtained by sintering sol–gel-derived stoichiometric powders at 1000 °C for 6 h. X-ray powder diffraction, transmission electron microscopy, and infrared spectroscopy studies confirm the formation of single-phase solid solutions. The Ga3+ co-doping decreases dc electrical conductivity due to reduction in mobile charge carrier concentration. The symmetrical cells with the configurations Pr1.3Sr0.7Ni0.7 − x Ga x Cu0.3O4 + δ /GDC/Pr1.3Sr0.7Ni0.7 − x Ga x Cu0.3O4 + δ prepared by screen printing are characterized using scanning electron microscopy and complex impedance spectroscopy. The lowest electrode polarization resistance (R p = 0.202(3) Ω cm2 at 700 °C) and minimum activation energy (E a = 1.325(4) eV) observed at x = 0.05 are attributed to an increase in bulk oxygen ion diffusion. The non-charge transfer adsorption/desorption of oxygen on the cathode (O2 , abs ⇔ 2Oabs) and O2− diffusion are coexisting major steps of the oxygen reduction reaction (ORR).

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Acknowledgements

The authors are thankful to University Grants Commission (UGC), New Delhi (India), for financial assistance through project F. no. 42-7615/2013 (SR) to carry out this work. Mr. M. G. Bansod is thankful to UGC, New Delhi (India), for the award of Rajiv Gandhi National Fellowship (F1-17.1/2016-17/RGNF-2015-17-SC-MAH-426/(SAIII/Website)). Also, the authors are thankful to SAIF, IIT Bombay (India), for providing FEG-SEM and FEG-TEM facilities.

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Authors and Affiliations

  1. Department of Physics, RTM Nagpur University, Nagpur, MS, India

    M. Bansod & S. S. Bhoga

  2. School of Chemistry, University of St Andrews, St Andrews, Scotland, UK

    A. P. Khandale

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  1. M. Bansod
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  2. A. P. Khandale
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  3. S. S. Bhoga
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Correspondence to A. P. Khandale.

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Bansod, M., Khandale, A.P. & Bhoga, S.S. Structural and electrochemical investigation on Ga3+ doped Pr1.3Sr0.7Ni0.7Cu0.3O4 + δ cathodes for IT-SOFC applications. Ionics 23, 2561–2570 (2017). https://doi.org/10.1007/s11581-017-1998-9

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  • DOI: https://doi.org/10.1007/s11581-017-1998-9

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