Fig. 4

a The complete XPS spectra of Ag/Au/AgCl hollow heterostructures. b Main peaks of Ag 3d 5/2 and Ag 3d 3/2. c Main peaks of Au 4f 7/2 and Au 4f 5/2. d Main peaks of Ag 2p 5/2 and Ag 2p 3/2
a The complete XPS spectra of Ag/Au/AgCl hollow heterostructures. b Main peaks of Ag 3d 5/2 and Ag 3d 3/2. c Main peaks of Au 4f 7/2 and Au 4f 5/2. d Main peaks of Ag 2p 5/2 and Ag 2p 3/2