An Alternative Approach for Determining Charge Storage Mechanisms of Supercapacitors Using Sinusoidal Potential Scan

While the progress in novel designs of electrode materials has significantly improved energy storage device performance, particularly supercapacitors, understanding their impact on charge storage mechanisms remains uncertain. Moreover, the diversity of analytical techniques used for investigating these mechanisms often yields markedly different results, hindering effective comparison and comprehension of the underlying processes. To address these challenges, this work focuses on proposing an alternative approach to determine the contribution of charge storage. The results will be assessed in a similar manner to the conventional methods such as Trasatti's and Dunn's methods, which are typically employed in cyclic voltammetry (CV) measurements. Conventionally, CV measurements utilize cyclic triangular potential scans to investigate current responses. In this work, we specifically propose voltammetric measurements using a sinusoidal potential scan. Not only is this approach simple and easy to employ, but its responses can be conveniently utilized for further characterization, providing consistent results regardless of the analytical approaches. Thus, this approach enables a comprehensive understanding of the fundamental aspects of charge storage mechanisms. This research thus holds significant value for those involved in the development of supercapacitors, as it paves the way for advancements in future supercapacitors.