Synthesis and characterization of NH₄PO₃ based composite with superior proton conductivity for intermediate temperature fuel cells

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• 作者：Chunwen Sun ; Ulrich Stimming
• 关键词：Polyphosphate ; Composite ; Conductivity ; Intermediate temperature fuel cells
• 刊名：Electrochimica Acta
• 出版年：2008
• 出版时间：20 September 2008
• 年：2008
• 卷：53
• 期：22
• 页码：6417-6422
• 全文大小：1341 K

文摘

In this work, we prepared NH₄PO₃/MO₂ (MSi, Ti) composite materials with various amounts of TiO₂ using a sol–gel method, which are potential for application as electrolytes for intermediate temperature fuel cells (150–250 °C). The effect of the amount of TiO₂ on the conductivities of the composite was investigated systematically by an impedance spectroscopy within the temperature range of 50–275 °C under different atmospheres. The composite SiTiO10APP (10 mol % TiO₂) showed high proton conductivity, 0.001–0.043 S cm⁻¹ at 150–250 °C. The maximum conductivities are 0.043 S cm⁻¹ at 225 °C under humid H₂ and 0.0085 S cm⁻¹ at 175 °C under humid air, respectively. A thermogravimetric analysis showed the composite had high thermal stability below 300 °C. Moreover, it was found that the microstructure has significant effect on the conductivity of the composites at higher temperature.