fig3

Figure 3. Hydrophobicity, mechanical and morphological characterization of the electrospun P(VDF-HFP) mats. (A) Contact angle curve of the electrospun fiber mats decreasing with the increasing solid content of the spinning solution; (B) Stress-strain curves of electrospun fiber mats with different polymer concentrations (8 wt% to 18 wt%; (C-E) High-magnification SEM images revealing the detailed surface texture and porosity of the optimal fiber mat; (F-K) Cross-sectional SEM image and elemental mapping of the triboelectric layer, clearly revealing the Ag electrode layer and the presence of C, O, and F in the triboelectric material layer. P(VDF-HFP): Poly(vinylidene fluoride-co-hexafluoropropylene); SEM: scanning electron microscopy.