Rethinking Supercapacitors: A Guideline Perspective of Do's and Don'ts

ABSTRACT Supercapacitors have gained significant attention as promising candidates for next‐generation energy storage systems, bridging the performance gap between batteries and conventional capacitors. Despite the rapid growth of research in this field, persistent methodological inconsistencies and reporting inaccuracies continue to undermine its reproducibility and the ability to make meaningful comparisons. Common issues include miscalculations of capacitance, inappropriate electrode mass loading, and improper use of electrochemical parameters. Additionally, the overlap between battery‐like and pseudocapacitive behaviours in nanostructured electrode materials complicates their classification and performance evaluation processes. This Perspective critically analyzes the experimental and analytical practices that shape supercapacitor research and provides a structured framework for accurate measurement, data interpretation, and material categorisation. A systematic set of guidelines (Do's and Don'ts) is proposed to mitigate recurring errors in electrode characterisation and device fabrication. Focusing on aqueous asymmetric systems, this review outlines best practices for their design, evaluation, and reporting, proposing a coherent roadmap toward their standardised development and reliable commercialisation as efficient, high‐performance energy storage devices.