Figure 4: XPS results for pure 3D PGC and the 3D S@PGC (90% S) composite.

(a) C 1s XPS spectrum of pure PGC. (b) XPS survey spectrum of the 3D S@PGC (90% S) composite. (c) C 1s and (d) S 2p XPS spectra of the 3D S@PGC (90% S) composite. The data indicate the presence of C–S bonds in the 3D S@PGC (90% S) composite.