Figure 5
From: A novel approach to prepare Bi2Fe4O9 flower-like spheres with enhanced photocatalytic performance
(a) Survey XPS spectrum of Bi2Fe4O9 and etched flower-like Bi2Fe4O9 samples; The high-resolution XPS spectra of (b) Bi 4 f, (c) Fe 2p, (d) O 1 s.
