Abstract
The solid solubility limit of Ce in Nd2–x Ce x CuO4 ± δ , prepared by sol–gel process, is established up to x = 0.2. The transition from negative temperature coefficient to positive temperature coefficient, within the solid solubility region, is observed at 620 °C. The area-specific-resistance (ASR) is optimized for electrochemical cell sintered at 800 °C. ASR enhances with increase in sintering temperature of cell. ASR value of 0.93 ohm cm2 at 700 °C, determined by electrochemical impedance spectroscopy is comparable against that by voltage versus current (V–I) characteristics at 0.98 ohm cm2 at the same temperature. Electrochemical performance and ASR of Nd1.8Ce0.2CuO4 ± δ is improved when prepared by sol–gel route over solid-state reaction, which is attributed to uniform size and shape of nanocrystalline grains.
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Acknowledgments
Ms. A. P. Khandale is thankful to UGC, New Delhi for awarding Rajeev Gandhi fellowship (F14-2(SC)/2007(SA-III)). Authors are thankful to UGC, New Delhi for the financial support through SAP/DRS to carry out this work.
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Khandale, A.P., Bhoga, S.S. Study of Nd2–x Ce x CuO4 ± δ (x = 0.1–0.25) as cathode material for intermediate-temperature solid oxide fuel cells. J Solid State Electrochem 16, 341–352 (2012). https://doi.org/10.1007/s10008-011-1332-9
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DOI: https://doi.org/10.1007/s10008-011-1332-9