Alkaline earth metal doped tin oxide as a novel oxygen storage material

Abstract

Alkaline earth metal doped tin oxide (SnO2) hollow nanospheres with a diameter of 50nm have been synthesized successfully via a facial solvothermal route in a very simple system composed of only ethanol, acetic acid, SnCl4·5H2O and A(NO3)2·xH2O (A=Mg, Ca, Sr, Ba). The synthesized undoped SnO2 and A-doped SnO2 hollow nanospheres were characterized by the oxygen storage capacity (OSC), X-ray diffraction, transmission electron microscopy and the Brunauer–Emmet–Teller (BET) technique. The OSC values of all samples were measured using thermogravimetric-differential thermal analysis. The incorporation of alkaline earth metal ion into tin oxide greatly enhanced the thermal stability and OSC. Especially, Ba-doped SnO2 hollow nanospheres calcined at 1000°C for 20h with a BET surface area of 61m2g−1 exhibited the considerably high OSC of 457μmol-Og−1 and good thermal stability. Alkaline earth metal doped tin oxide has the potential to be a novel oxygen storage material.