Estimation of Relaxation Time Using Electrochemical Impedance Spectroscopy of Graphitic Carbon Nitride-Based Supercapacitor

This work explains the impact of different electrochemical analyses, especially electrochemical impedance spectroscopy (EIS), towards the identification of essential parameters for energy storage applications. The EIS analysis of supercapacitors devices comprising graphitic carbon nitride (g-C
3
N
4
) based electrode materials is described here to realize different equivalent circuit models and estimate the relaxation time offered by the electrode materials. The supercapacitive charge storage phenomenon is influenced by different parts of existing supercapacitor devices, and the proper amalgamation and optimization of these parts will enrich the overall charge storage behaviors of the entire supercapacitor device. A simple facile, cost-effective synthesis process was adopted to synthesize g-
3
N
4
, and distinct electrolytes were used to explain the effect of proper electrode/electrolyte interfaces to estimate the various essential parameters, especially relaxation time. This study reveals that the electrode materials composed of g-
3
N
4
offer acceptable relaxation time, thus showing immense potential for designing various binary and ternary nanocomposites based on g-
3
N
4
for supercapacitor applications.