Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 42, Issue 34, Pages 22228-22234Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2017.03.089
Keywords
Electrolyte layer-free fuel cell (EFFC); Ce0.8Sm0.2O2_(delta) (SDC); Sm0.5Sr0.5CoO3 (SSC); Ionic and semi-conducting material; Balanced ionic and electronic
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Funding
- National Natural Science Foundation of China (NSFC) [11604088]
- Natural Science Foundation of Hubei Province [2015CFA120]
- Swedish Research Council [621-2011-4983]
- European Commission [303454]
- Hubei Provincial 100-Talent Distinguished Professor Grant
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An advanced electrolyte-free fuel cell (EFFC) was developed. In the EFFC, a composite layer made from a mixture of ionic conductor (Ce0.8Sm0.2O2_(delta), SDC) and semiconductor (Sm0.5Sr0.5CoO3, SSC) was adopted to replace the electrolyte layer. The crystal structure, morphology and electrical properties of the composite were characterized by X-ray diffraction analysis (XRD), scanning electron microscope (SEM), and electrochemical impedance spectrum (EIS). Various ratios of SDC to SSC in the composite were modulated to achieve balanced ionic and electronic conductivities and good fuel cell performances. Fuel cell with an optimum ratio of 3SDC:2SSC (wt.%) reached the maximum power density of 741 mW cm(-2) at 550 degrees C. The results have illuminated that the SDC-SCC layer, similar to a conventional cathode, can replace the electrolyte to make the EFFC functions when the ionic and electronic conductivities were balanced. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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