The 3C AZIC exhibited a high Coulombic efficiency (~ 100 %) at all current densities and good rate capability. EIS analysis was also performed to AZICs to assess the charge transfer characteristics (Figure ). All AZIC devices had a serial resistance (Rs) of 2.32-2.48 Ω. In the high-frequency region of the EIS spectra, a semicircle indicative of charge transfer resistance at the electrode-electrolyte interface was observed in all samples. The Rct were determined as 5.91, 8.25, and 2.72 Ω for the 1C, 2C, and 3C devices, respectively. The notably low Rct of the 3C supercapacitor suggests enhanced charge transfer properties in the fabricated device. The specific capacitances of the developed AZIC devices were calculated using the GCD curves and plotted with respect to current densities (Figure ). The specific capacitance values for AZIC devices prepared using the 1C, 2C and 3C porous carbon materials were found as 588.4, 475.5 and 754.7 F g -1 , respectively, at 0.1 A g -1 . When the current density was increased to 20 A g -1 , the Csp was found as 168.3, 139.3 and 224.1 F g -1 for the 1C, 2C, and 3C AZICs, respectively (more details in Tables ). The AZICs showed remarkable Csp values at low current densities and then Csp values become constant at high current densities. The obtained results demonstrate that the fabricated devices have an impressive rate capability. The high rate capability of 3C is attributed to the dominant surface capacitive charge storage mechanism (Figure ). The AZIC device prepared using the 3C material demonstrated one of the highest specific capacitance values ever reported for similar devices (Table ). The long-term GCD measurements were employed in order to evaluate the stability and lifetime of the developed AZIC devices. Aa a result, it was found that 95.3, 82.6, and 78.7 % of the capacitance retained after 3800 cycles at 2.0 A g -1 for AZIC devices prepared using 1C, 2C and 3C materials, respectively. Finally, the energy densities and power densities of the developed supercapacitors and AZIC devices were compared to the typical values on a Ragone plot (Figure ). As shown, the 3C AZIC device shows a high energy density of 336.6 Wh kg -1 at a power density of 89.7 Wh kg -1 , which maintains 74.4 Wh kg -1 at a power density of 15460 Wh kg -1 . The fabricated supercapacitor devices show higher energy densities than the many of the reported supercapacitors. The AZICs devices exhibit battery-level energy densities while maintaining their high power densities. The obtained results show that the fabricated devices can be used as energy and power sources for many application, which requires high electrochemical performance. 62