Abstract
Composites proton conducting material based on cesium dihydrogen phosphate (CDP) doped with zirconium oxide (1−x) CsH2PO4/x ZrO2 were synthesized with different concentration having in the range such as x = 0.1, 0.2, 0.3 and 0.4 by ball milling method. The prepared solid acid composites were dried at 150 °C for 6 h. Structural and thermal characterization of solid acid composite proton electrolytes were carried out by X-ray diffractometer, Fourier transform infrared spectroscopy, and Raman spectroscopy respectively. Phase transition of the prepared materials was carried out by using differential scanning calorimetry and conductivity was measured by LC Impedance meter in the range 1 Hz to 400 kHz. The ionic conductivity of ZrO2 doped CsH2PO4 (CDP) was increased up to 1.3 × 10–2 S cm−1 at the 280 °C under environment atmospheric humidification which showed high stability as compared to pure CsH2PO4 (CDP). This obtaining result would be useful for establishing and design the next generation fuel cell.
Highlights
Fuel cells are an electrochemical cell that converts chemical energy into electrical energy through electrochemical reactions
At the transition temperature cesium dihydrogen phosphate (CDP) changed from the monoclinic phase to the tetragonal phase, this changed increase ionic conductivity followed by the Grotthuss mechanism [10]
The X-ray diffraction (XRD) patterns of the CDP and CDP/ZrO2 electrolyte composites were measured in the powdered form under the atmospheric condition, after heat treatment of 100 °C for 2 h
Summary
Fuel cells are an electrochemical cell that converts chemical energy into electrical energy through electrochemical reactions. Solid electrolytes are exhibit high ionic conductivity, low activation energy, good mechanical properties, and are found to be promising materials for solid-state batteries, fuel cells, sensors, memory cells, solid-state batteries, etc. The superprotonic phase of CDP is unstable because of its dehydration under normal conditions [11] It is thermally stable in an atmosphere containing more than 30 mol% H2O, which is not favorable for fuel cell electrolytes [12]. Ponomareva et al [20] observed that the conductivity of CDP at low temperatures was improving several orders by small amount doping of SiO2. We will observe the transport, thermal properties and ionic conductivity of the composite electrolytes 0.9CDP-0.1ZrO2, 0.8CDP-0.2ZrO2, 0.7CDP0.3ZrO2, and 0.6CDP-0.4ZrO2 at different temperature
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