Figure 1 : Structure and morphology characterization.

From: A tailored double perovskite nanofiber catalyst enables ultrafast oxygen evolution

Figure 1

(a) Schematic of PrBaCo2O5+δ (PBC)/PrBa0.5Sr0.5Co1.5Fe0.5O5+δ (PBSCF) double perovskite crystal structure. (b) XRD patterns of PBC-0 and PBSCF-0 powders. (c) Fast Fourier transform (FFT) pattern (obtained from region of 23 nm × 23 nm) and (d) corresponding schematic crystal structure of single unit cell of PBSCF. (eg) Bright-field TEM images of (e) PBSCF-I, (f) PBSCF-II and (g) PBSCF-III nanofibers. (h,i) FFT patterns (obtained from region of 19 nm × 19 nm and 15 nm × 15 nm, respectively) of PBSCF-III; inset in i is the schematic crystal structure of single unit cell of PBSCF along [221] zone axis. Red circles indicate the superlattice reflections, which are characteristics of the double perovskite structure. Scale bar, 100 nm (eg).