Facile modified synthesis and intermediate temperature electrical properties of Sn0.95Al0.05P2O7/KSn2(PO4)3 composite electrolyte

In this study, Sn0.95Al0.05P2O7 and a novel dense Sn0.95Al0.05P2O7/KSn2(PO4)3 composite electrolytes were synthesized. The structural characterization of X-ray diffraction (XRD) and microstructual properties of scanning electron microscopy (SEM) were carried out. The XRD results indicated that an in-situ reaction between Sn0.95Al0.05P2O7 and inorganic melt salt take place to form the Sn0.95Al0.05P2O7/KSn2(PO4)3 composite. The intermediate temperature electrical properties were determined by using impedance spectroscopy, oxygen concentration cell and hydrogen concentration discharge cell. Finally, the H2/O2 fuel cell using the Sn0.95Al0.05P2O7/KSn2(PO4)3 as electrolyte membrane was constructed and the obtained maximum power output densities were 67.7 mW cm−2 and 142.1 mW cm−2 at 650 °C and 700 °C, respectively.