Figure 3

Scanning stability experiments using few-layer graphene; linear sweep voltammetry (LSV) (A; scan rate: 25 mV s⁻¹; vs. RHE; solution: 0.5 M H₂SO₄). (B) Typical Raman profile of the few-layer graphene described and presented in (C–E). Optical images of a few-layer graphene unused (C), after 10 LSV scans (F), after 20 LSV scans (I) and after 30 LSV scans (L). 2D Raman mapping of the few-layer graphene unused (D), after 10 LSV scans (G), after 20 LSV scans (J) and after 30 LSV scans (M). 3D Raman mapping of the few-layer graphene unused (E), after 10 LSV scans (H), after 20 LSV scans (K) and after 30 LSV scans (N), all in red colour and compared to the unused sheet (yellow overlay). Raman maps show intensity of graphene’s G band (ca. 1590 cm⁻¹).