A Mesoporous Structure SnP2O7/Graphite Oxide Composite as Proton Conducting Electrolyte for High-Temperature Proton Exchange Membrane Fuel Cells

作者：Huang, Min; Huang, Xin; Fei, MingMing; Deng, Yuming; Huang, Xiaozhou; Xu, Chenxi^*; Cheng, Jigui; Luo, Paifeng; Lu, Yinwei

来源：International Journal of Electrochemical Science, 2017, 12(5): 4585-4596.

DOI：10.20964/2017.05.78

• High-temperature proton exchange membrane fuel cells
• Graphite Oxide
• mesoporous structure
• capillary condensation

Proton conductors operated in over 200 degrees C have received great interest for proton exchange membrane fuel cells (PEMFCs). The tetravalent metal ion pyrophosphates materials (MP2O7) are considered as the suitable conductor electrolyte, and the mesopores structure MP2O7 are attractive, because capillary condensation of water molecules occurs at relatively low relative humidity, allowing for fast transport of protons without excessive humidification. In this study, we report meso-SnP2O7, which is synthesized from mesoporous SnO2, as promising solid electrolyte candidate for PEMFCs in a temperatures range of 180 degrees C to 280 degrees C. Furthermore, graphite oxide (GO) is incorporated with the meso-SnP2O7 to further improve the proton conductivity and water retention. The structure and phase stability of the membranes are analysed by X-ray diffraction (XRD) and thermos-gravimetric analysis (TGA). The microstructure morphology of SnP2O7 particles and pellets is analysed by transmission electron microscope (TEM) and scanning electron microscopy (SEM). The obtained particles and pores size of Meso-SnP2O7 are characterized by the ETA potential meter and BET. The Meso-SnP2O7 and Meso-SnP2O7/GO electrolytes exhibit the high proton conductivities of 0.15 S cm(-1) and 0.17 S cm(-1) at 220 degrees C, respectively. Moreover, the peak power densitiy of the Meso-SnP2O7/GO membrane is 18 mWcm(-2) at 220 degrees C with OCV of 0.83V.

• 出版日期2017-5
• 单位合肥工业大学