Conduction and stability performance of CsH2PO4 with NaH2PO4/ZrO2 for fuel cell

Abstract

Solid acid composites of CsH _2 PO _4 /NaH _2 PO _4 /ZrO _2 with different weight ratios of CsH _2 PO _4 (CDP), NaH _2 PO _4 (SDP), and ZrO _2 were synthesized and characterized. The characterizations of the solid acid composite were carried out for determining structure, thermal stability, and conductivity, utilizing x-ray Diffraction, Fourier Transform Infrared Spectroscopy, Thermogravimetric analysis, Differential Thermal Analysis, and conductivity measurements. The composite powders were in the form of pellets of 4 mm thickness for conductivity measurement. SDP in the composites has a large effect on the conductivity measurement and this material increased the low-temperature conductivity of CDP by up to 1.5 orders of magnitude. The superprotonic transition was identified at temperatures from 220 to 270 °C in CDP/SDP/ZrO _2 composites under atmospheric pressure. The thermal stability of the solid acid composites for dehydration, melting, and decomposition was investigated in the temperature range of 50 to 300 °C under environments with atmospheric humidification.

Keywords

• composite
• conductivity
• cesium dihydrogen phosphate
• fuel cell