| Lowering grain boundary resistance of BaZr(0.8)Y(0.2)O(3-δ) with LiNO(3) sintering-aid improves proton conductivity for fuel cell operation. | |
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MedLine Citation:
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PMID: 21103585 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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A novel sintering additive based on LiNO(3) was used to overcome the drawbacks of poor sinterability and low grain boundary conductivity in BaZr(0.8)Y(0.2)O(3-δ) (BZY20) protonic conductors. The Li-additive totally evaporated during the sintering process at 1600 °C for 6 h, which led to highly dense BZY20 pellets (96.5% of the theoretical value). The proton conductivity values of BZY20 with Li sintering-aid were significantly larger than the values reported for BZY sintered with other metal oxides, due to the fast proton transport in the "clean" grain boundaries and grain interior. The total conductivity of BZY20-Li in wet Ar was 4.45 × 10(-3) S cm(-1) at 600 °C. Based on the improved sinterability, anode-supported fuel cells with 25 μm-thick BZY20-Li electrolyte membranes were fabricated by a co-firing technique. The peak power density obtained at 700 °C for a BZY-Ni/BZY20-Li/La(0.6)Sr(0.4)Co(0.2)Fe(0.8)O(3-δ) (LSCF)-BZY cell was 53 mW cm(-2), which is significantly larger than the values reported for fuel cells using electrolytes made of BZY sintered with the addition of ZnO and CuO, confirming the advantage of using Li as a sintering aid. |
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Authors:
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Ziqi Sun; Emiliana Fabbri; Lei Bi; Enrico Traversa |
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Publication Detail:
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Type: Journal Article Date: 2010-11-23 |
Journal Detail:
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Title: Physical chemistry chemical physics : PCCP Volume: 13 ISSN: 1463-9084 ISO Abbreviation: Phys Chem Chem Phys Publication Date: 2011 May |
Date Detail:
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Created Date: 2011-04-18 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100888160 Medline TA: Phys Chem Chem Phys Country: England |
Other Details:
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Languages: eng Pagination: 7692-700 Citation Subset: IM |
Affiliation:
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WPI International Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba 305-0044, Ibaraki, Japan. Traversa.Enrico@nims.go.jp. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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