Figure 1

TEM images of CeO₂ nanocubes calcined at 350 °C (a), 450 °C (b), 550 °C (c), 650 °C (d); HRTEM image of CeO₂ nanocubes calcined at 550 °C (e); fast Fourier transform (FFT) analysis of CeO₂ nanocubes calcined at 550 °C (f). Scale bar: 50 nm for a–d, 5 nm for e.