Table 3. Specific capacitances, energy densities, power densities, and ESR values for Pr-AC-electrode, (Pr-AC:Fe₂O₃)-HCEs, and Fe₂O₃-electrode

Electrodes	Potential window (V)	Specific capacitance(Fg−1) at 1 Ag−1	Energy density (Whkg−1)	Power density (Whkg−1)	ESR (Ω)
Pr-AC	–1 to –0.2	59.02	5.12	371.33	0.44
1:1 (Pr-AC:Fe2O3)-HCEs	–1.15 to –0.4	82.42	6.36	372.75	0.47
1:2 (Pr-AC:Fe2O3)-HCEs	–1.15 to –0.4	49.04	3.76	373.88	0.64
2:1 (Pr-AC:Fe2O3)-HCEs	–1.15 to –0.4	102.22	4.34	395.15	0.42
Fe2O3	–1.15 to –0.4	95.75	6.82	358.21	0.73

ESR: equivalent series resistance, Pr-AC: prepared activated carbon, HCE: hybrid composite electrodes.