Fig. 5.
XPS spectra of the constituent elements of MoOxSy-CoPi nanoflowers, where (a) shows complete elemental XPS survey indicated the presence of Mo, S, Co, P, and O elements, (b) shows the Mo (3d) spectra consisting of two spin–orbit triplet peaks characteristics of Mo-S (3d5/2), Mo-S (3d3/2), and a residual Mo-O (3d), respectively, (c) contains residual peaks with two dominant spin–orbit doublets S2- 2p3/2 & S2- 2p5/2, (d) elaborates XPS spectra of Co doublet 2P splitting, i.e., 2p3/2 and 2p1/2, (e) displays the P (2p) spectra that exhibit characteristic 2p3/2 doublets of Phosphorous and (f) demonstrates the spectra of O (1 s), i.e., low energy metal–oxygen (M−O) and higher energy nonmetal-oxygen (NMO) photoelectron peaks.