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Materials 2018, 11(9), 1583; https://doi.org/10.3390/ma11091583

SrCe0.9Sm0.1O3-α Compounded with NaCl-KCl as a Composite Electrolyte for Intermediate Temperature Fuel Cell

1
School of Chemical and Material Engineering, Fuyang Normal College, Fuyang 236037, China
2
Department of science and health, Fuyang Preschool Education College, Fuyang 236015, China
*
Authors to whom correspondence should be addressed.
Received: 25 July 2018 / Revised: 20 August 2018 / Accepted: 30 August 2018 / Published: 1 September 2018
(This article belongs to the Section Energy Materials)
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Abstract

SrCeO3 and SrCe0.9Sm0.1O3-α were synthesized using a high-temperature solid-state reaction method using Sm2O3, SrCO3, CeO2 as precursors, then the SrCe0.9Sm0.1O3-α-NaCl-KCl composite electrolyte was fabricated by compounding SrCe0.9Sm0.1O3-α with NaCl-KCl and sintering it at a lower temperature (750 °C) than that of a single SrCeO3 material (1540 °C). The phase and microstructure of the samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The conductivities of the samples were measured in dry nitrogen atmosphere using electrochemical analyzer. The conductivities of the SrCeO3, SrCe0.9Sm0.1O3-α and SrCe0.9Sm0.1O3-α-NaCl-KCl at 700 °C were 2.09 × 10−5 S·cm−1, 1.82 × 10−3 S·cm−1 and 1.43 × 10−1 S·cm−1 respectively. The conductivities of SrCe0.9Sm0.1O3-α-NaCl-KCl composite electrolyte are four orders of magnitude higher than those of SrCeO3 and two orders of magnitude higher than those of SrCe0.9Sm0.1O3-α. The result of logσ ~ logpO2 plot indicates that SrCe0.9Sm0.1O3-α-NaCl-KCl is almost a pure ionic conductor. The electrolyte resistance and the polarization resistance of the H2/O2 fuel cell based on SrCe0.9Sm0.1O3-α-NaCl-KCl composite electrolyte under open-circuit condition were 1.0 Ω·cm2 and 0.2 Ω·cm2 respectively. Further, the obtained maximum power density at 700 °C was 182 mW·cm−2. View Full-Text
Keywords: defects; composite; electrolytes; hydrogen; fuel cell; conductivity defects; composite; electrolytes; hydrogen; fuel cell; conductivity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Shi, R.; Chen, W.; Hu, W.; Liu, J.; Wang, H. SrCe0.9Sm0.1O3-α Compounded with NaCl-KCl as a Composite Electrolyte for Intermediate Temperature Fuel Cell. Materials 2018, 11, 1583.

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