Ce ₂ Sn ₂ O ₇ /CNFs composite as a material for gas sensors and supercapacitors

Cerium stannate Ce2Sn2O7 was obtained by the hydrothermal method from a mixture of cerium (III) nitrate and sodium stannate solutions with the addition of sodium hydroxide solution to pH 8–9. The phase composition of the hydrothermal synthesis product was studied using thermal anlysis, X-ray diffraction, scanning electron microscopy and FTIR spectroscopy. It was found that at a synthesis temperature of 180 °C, a single-phase cerium stannate with a pyrochlore structure, the particles of which have a cubic shape of 2–5 μm in size, is formed. It was shown that the response of the Ce2Sn2O7/CNFs composite to NO2 at room temperature is 41% at 10 ppm. The composite material demonstrated the possibility of its application in supercapacitors, showing a specific capacitance of 165–200 F/g at 2 mV/s. It was found that the specific capacitance of the Ce2Sn2O7/CNFs composite significantly exceeds that of single-phase cerium stannate.