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![Thin-walled hollow fibers for flexible high energy density fiber-shaped supercapacitors](https://image.oaes.cc/82825a7e-4fb8-46d1-a3db-02f27ea16bd6/4374.fig.1.jpg)
Figure 1. (A) Schematic illustration of preparation process, microstructure and surface charge distribution of HPFs. Cross-sectional SEM images of (B) HPFs and (C) SPFs. Side-view SEM images of (D) HPFs and (E) SPFs. HPF: Hollow poly(3,4-ethylenedioxythiophene):polystyrene sulfonate thin-walled fibers; SPF: solid PEDOT:PSS fibers; SEM: scanning electron microscopy.