Citation: DENG Xu-Li, ZHAO Dong-Mei, DING Zuo-Long, MA Gui-Lin. Dense 5%Al³⁺-Doped SnP₂O₇-SnO₂ Composite Ceramic for Application in Intermediate Temperature Fuel Cell[J]. Acta Physico-Chimica Sinica, ;2013, 29(05): 953-958. doi: 10.3866/PKU.WHXB201302254 shu

Dense 5%Al³⁺-Doped SnP₂O₇-SnO₂ Composite Ceramic for Application in Intermediate Temperature Fuel Cell

1.
Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China

Received Date: 20 December 2012
Available Online: 25 February 2013
Fund Project: 国家自然科学基金(20771079) (20771079)

Dense non-doped and 5% (molar fraction) Al³⁺-doped SnP₂O₇-SnO₂ composite ceramics were prepared by reacting non-doped and 5% Al³⁺-doped SnO₂ porous substrates, respectively, with 85% H₃PO₄ solution at 600℃. The composite ceramics were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive spectroscopy (EDS). Their conductivities in the intermediate temperature range of 100-250℃ in wet air and wet H₂ atmospheres were measured by electrochemical impedance spectroscopy (EIS). The conductivities of the 5% Al³⁺-doped SnP₂O₇-SnO₂ composite ceramic were higher than the conductivities of the non-doped SnP₂O₇-SnO₂ composite ceramic and reached 4.30×10^-2 S·cm^-1 in wet air and 6.25×10^-2 S·cm^-1 in wet H₂ at 250℃. These values are higher than those of the SnP₂O₇-SnO₂ based composite ceramic and SnP₂O₇-based ceramics under similar conditions. An H₂/air fuel cell containing the 5% Al³⁺-doped SnP₂O₇-SnO₂ composite ceramic as an electrolyte (thickness: 1.45 mm) and porous platinum as electrodes exhibited satisfactory cell performance. The maximum output power densities of this cell were 52.0 mW·cm^-2 at 175℃, 61.9 mW·cm^-2 at 200℃ and 82.3 mW·cm^-2 at 250℃. Such od performance is related to the high conductivity and sufficient density of the composite ceramic electrolyte as well as the low interfacial polarization resistance of the cell.
- SnP₂O₇,
- Composite ceramic,
- Electrolyte,
- Conductivity,
- Fuel cell
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Dense 5%Al3+-Doped SnP2O7-SnO2 Composite Ceramic for Application in Intermediate Temperature Fuel Cell

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Dense 5%Al³⁺-Doped SnP₂O₇-SnO₂ Composite Ceramic for Application in Intermediate Temperature Fuel Cell