Electrochemical capacitors, also known as supercapacitors, are energy storage devices like batteries, yet they can be recharged a hundred to a thousand times faster. Because of their enabling features, supercapacitors are replacing batteries and capacitors in an increasing number of applications. Supercapacitors are used in today’s smartphones to provide a high-intensity flash for camera phones. In addition, their high power density and excellent low-temperature performance have made them the technology of choice for backup power, regenerative braking and whenever a high power is required in a short period of time. They also play an important role in the progress of hybrid and electric vehicles. However, the low energy density of the current supercapacitors is the main impediment to realizing the full commercial potential of this technology. This has triggered tremendous research efforts in order to develop new electrode materials that are capable of providing a huge amount of energy in a short period of time. In addition, the dramatic increase in flexible and miniaturized electronics has motivated the search for a new generation of energy storage systems that are flexible, foldable and even twistable, can be miniaturized to the microscale and store a large amount of charge per footprint. To address these issues, our research team is active in the following areas.