An oxide ion and proton co-ion conducting Sn0.9In 0.1P2 O7 electrolyte for intermediate- temperature fuel cells

Xilin Chen, Chunsheng Wang, E. Andrew Payzant, Changrong Xia, Deryn Chu

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57 Scopus citations

Abstract

The ionic conductivity of Sn0.9In0.1P2 O7 ceramic was investigated under various atmospheres within the temperature range of 130-230°C. Similar to mixed-conductive perovskite oxides at high temperatures (such as SrCe0.95Yb0.05 O 3-α, La0.9 Sr0.1Ga0.8 Mg 0.2 O3-α at 600-1000°C), Sn0.9In 0.1P2 O7 can conduct both protons and oxide ions at low temperatures (130-230°C). The conductivity of Sn 0.9In0.1P2 O7 reaches 0.019 Scm at 200°C in wet nitrogen. Its transport numbers determined by steam concentration cells are around 0.76 for a proton and 0.12 for an oxide ion. The performance of direct methanol fuel cells at 170°C using mixed-ion conductive Sn0.9In0.1P2 O7 electrolyte is higher than that at 235°C using pure proton conductive CsH2PO4 electrolyte. This is attributed to direct oxidation of CO at the anode by the oxide ions generated at the cathode and moved through the Sn0.9In0.1P2 O7 electrolyte.

Original languageEnglish
Pages (from-to)B1264-B1269
JournalJournal of the Electrochemical Society
Volume155
Issue number12
DOIs
StatePublished - 2008

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