This PDF file includes:

• Section S1. Characterization and instrumentation
• Section S2. Calculation of carbon fiber porosity using geometric analysis
• Section S3. Calculation of carbon fiber porosity using BET analysis
• Section S4. Calculation of the degree of mesopore interconnectivity
• Fig. S1. Additional SEM images, flexibility, and size distribution of PAN-b-PMMA-CFs.
• Fig. S2. Thermogravimetric analysis.
• Fig. S3. Wide-angle XRD spectra, Raman spectra, and FFT spectra.
• Fig. S4. Comparison of the pore size distributions from image analysis and NLDFT fitting.
• Fig. S5. Additional electrochemical performance of PAN-b-PMMA-CFs.
• Fig. S6. Capacitance contribution analyses.
• Fig. S7. Stability performance of PAN-b-PMMA-CFs.
• Fig. S8. XPS spectra and contact angles.
• Table S1. Summary of the electrochemical capacitive performance of PCF electrodes.
• Table S2. Summary of the physical and chemical characterization.
• Reference (55)

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