Chapter eleven - State of the art of supercapacitors

The supercapacitors (SCs) are highly appropriate for applications requiring rapid energy transfer as they provide high power density by relying on surface charge storage rather than bulk ion diffusion. The recent developments in porous nanomaterials and hybrid SC designs have enhanced the energy density and voltage windows, enlarging their practicability. This chapter presents state-of-the-art research on SC technology, focusing on different charge storage mechanisms and device designs that are lashing the upcoming energy storage solutions. We examine the charge storage mechanisms of electric double-layer and pseudocapacitors and scrutinize the electrochemical performance of symmetric, asymmetric, and hybrid SCs. Eventually, future developments, opportunities, and challenges in SC research will be discussed.