Figure S10. Internal resistance (IR) voltage drops of the SASCs versus current density. Figure S11. The enhanced mechanism of the electrode. α-Fe2O3/C Table S1. Element percentage of nanoarrays from the EDX spectra. α-Fe2O3/C Z Element Family Atomic Atomic Mass Mass Fit error Fraction Error Fraction Error (%) (%) (%) (%) (%) 6 C K 33.71 4.31 18.10 1.65 0.97 7 N K 1.93 0.46 1.19 0.26 1.71 8 O K 42.22 10.01 30.74 6.75 0.22 26 Fe K 22.13 4.08 49.98 8.04 0.08 Table S2. Element content of nanorods from the XPS analysis α-Fe2O3/C Element Atomic Conc % Iron 27.44 Oxygen 54.77 Nitrogen 0.58 Carbon 17.22 Table S3. Comparison of electrochemical performance of Fe2O3-based electrodes Cycle Life Material Potential Window Specific Capacitance Ref Retention 391.8 F g-1 at 1.25 A -1-0 V vs Ag/Ag 91.8% after This α-Fe2O3/C g-1 Nanoarrays Cl 4000 cycles work (431.0 F cm-2 at 1 mA
Figure S10. Internal resistance (IR) voltage drops of the SASCs versus current density. Figure S11. The enhanced mechanism of the α-Fe2O3/C electrode. Table S1. Element percentage of α-Fe2O3/C nanoarrays from the EDX spectra. Z Element Family Atomic Fraction (%) Atomic Error (%) Mass Fraction (%) Mass Error (%) Fit error (%) 6 C K 33.71 4.31 18.10 1.65 0.97 7 N K 1.93 0.46 1.19 0.26 1.71 8 O K 42.22 10.01 30.74 6.75 0.22 26 Fe K 22.13 4.08 49.98 8.04 0.08 Table S2. Element content of α-Fe2O3/C nanorods from the XPS analysis Element Atomic Conc % Iron 27.44 Oxygen 54.77 Nitrogen 0.58 Carbon 17.22 Table S3. Comparison of electrochemical performance of Fe2O3-based electrodes Material Potential Window Specific Capacitance Cycle Life Retention Ref α-Fe2O3/C Nanoarrays -1-0 V vs Ag/Ag Cl 391.8 F g-1 at 1.25 A g-1 (431.0 F cm-2 at 1 mA 91.8% after 4000 cycles This work
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