Fig. 4: sp2 to sp3 ratio by XPS-derived D-parameter.
From: Biocarbon from olive pomace residue as a sulfur host for carbonate-based lithium-sulfur batteries
A First differential of the C KVV Auger peak for A5AL9, A5AL9-S, A5AS9, and A5AS9-S, the vertical dotted lines show the minimum and the maximum of the first derivative. B Plot of XPS-derived D-parameter versus the calculated amount of C-sp2 for activated and reference samples.
