The magnified X-ray diffraction
(XRD) patterns of pristine BiVO4 and four GBVOx samples
with different target atom ratios (x = 0.02, 0.05, 0.10, and 0.15)
are shown in Fig. 2A (more details are in SI Appendix, Fig. S1
A–D) to identify the evolution of the crystal structure by doping