389505.fig.004a
(a)
389505.fig.004b
(b)
389505.fig.004c
(c)
389505.fig.004d
(d)
Figure 4: High-resolution XPS spectra of (a) Pt 4f; (b) Ti2p; (c) Nb3d; (d) O1S. Inset in (a) shows the corresponding deconvolution of Pt 4f spectrum.