and 3C electrodes at a scan rate of 1.0 mV s -1 were provided in Figure . The fabricated supercapacitors exhibited a rectangular CV curve shape, reflecting the electrical double layer capacitor type behavior. Among the fabricated supercapacitors, 3C devices showed the highest current density at same scan rates. The CV measurements were performed at different scan rates from 1.0 to 10,0000 mV s -1 and the CV graphs for 3C were provided in Figure ). The 3C supercapacitors showed a rectangular CV curve shapes up to 2000 mV s -1 and then a slight deviation in the curve shape was observed at higher scan rates. When the CV scans were performed at high sweep rates, the devices may not have enough time for the polarization and it may result in the deviation in the curve shape. Therefore, it is quite natural to have a deviation in shape when the sweep rate reached 10,000 mV s -1 . In Figure the galvanostatic charge-discharge curves (GCDs) were demonstrated. At 1.0 A g -1 , the fabricated devices showed highly symmetrical curves, reflecting high Coulombic efficiencies. The discharge times at 1.0 A g -1 were found as 56.0, 62.5 and, 77. and the CE was almost 100 % at higher current densities. Electrochemical Impedance Spectroscopy (EIS) measurement was performed to investigate the charge transfer properties of the fabricated supercapacitors (Figure ). The EIS measurement was performed at 0.0 V DC at 20 mV AC perturbation within a frequency range of 100 kHz to 10 mHz. At high frequency region of the EIS spectra, a semicircle formation due to the contact interface impedance among carbon particles and particles/current collector was observed for all samples. The Rct values were found The specific capacitances of the developed supercapacitors were calculated using the GCD curves and plotted with respect to current densities (Figure ). The specific capacitances of 1C, 2C, and 3C supercapacitors are 163.2, 170.5, and 213.4 F g -1 , respectively, at a current density of 0.1 A g - 1 , which is a considerable result with respect to similar porous carbon materials prepared using coordination polymers as precursors. The high surface area of the 3C demonstrated an EDLCtype behavior, reflecting a dominant surface capacitive charge storage in electrochemical kinetics (Figure ). In order to evaluate the service lifetime and the capacitance retention of the fabricated supercapacitors the long-term GCD measurements were conducted. As shown in the Figure , the supercapacitors prepared using the 1C and 2C materials exhibited high cycling stability for 33000 cycles, retaining 87.3 and 81.9 % capacitance, respectively and achieving nearly 100% CE. On the other hand, 3C supercapacitor exhibited only 39.8 % capacitance retention after 33,000 GCD cycles. The differences in the charge transfer properties of the developed porous carbon materials are directly related to their distinct structural features. In particular, it is known that various parameters, such as the particle size, crystal structure, active surface area, layer thickness, porosity, surface composition, and morphology, can be responsible for significantly altering the electrochemical properties of porous materials. Furthermore, while the pore structure engineering plays a critical role in achieving high power performance of capacitors, other effects, such as irreversible chemical reactions, electrolyte degradation or structural damage upon repeated charge/discharge cycling, might limit their capacitance retention and overall performance. In particular, the different charge transfer resistance observed for 1C, 2C and 3C could be explained by their distinct porosity, but also the fact that KOH was used as electrolyte for the conducted tests, which favors the 3C material prepared from the potassium-based precursor (3 • 3 H2O) due to the well-matched pore size. However, the high porosity of the 3C material might also be the reason for its limited capacitance retention due to various factors like lower structural stability or possible irreversible chemical transformations. Moreover, while the use of Na, K and Cs salts as activators in the high-temperature carbonization process is well studied, the similar approach employing Li salts is still greatly unexplored. The surprisingly poor rate capability of supercapacitor prepared using material 1C most likely is related to the pore bottlenecks limiting their accessibility to KOH electrolyte, but more in depth investigations in this area exceed the scope of this report and will be published in due course.