fig2

Figure 2. (A) Strain-stress curves of HPFs and SPFs. (B) LSV curves of HPFs and SPFs at a scanning rate of 5 mV s^-1. (C) EIS analysis of HPFs and SPFs (inset shows the magnified spectrum of HPFs). (D) CV and (E) GCD curves of HPFs and SPFs at 0.0-1.5 V. (F) Fourier transform infrared spectra of original polymer fibers without H₂SO₄ treatment, SPFs and HPFs. HPF: Hollow poly(3,4-ethylenedioxythiophene):polystyrene sulfonate thin-walled fibers; SPF: solid PEDOT:PSS fibers; LSV: linear scanning voltammetry; EIS: electrochemical impedance spectroscopy; CV: cyclic voltammetry; GCD: galvanostatic charge-discharge.