The topic of self-discharge in supercapacitors is important as it affects the performance and lifespan of these energy storage devices. The study mentioned above highlights the two-phase process of self-discharge and the importance of optimizing stabilization time to minimize capacity loss. The observation of hydrophilization of the negative electrode due to long-term polarization is also interesting and could potentially lead to further research on electrode surface modifications to improve supercapacitor performance. Overall, understanding self-discharge processes in supercapacitors is crucial for their successful integration into various applications such as electric vehicles and renewable energy systems.