This document discusses different geometries for supercapacitors including 3D spacer yarn, 2D interdigitated and 2D striped designs, and planar designs. It explores applications for supercapacitors such as powering solar charged devices like an army pack or wifi phone, charging wearables like a charging shirt, and uses in medical devices like pacemakers or devices that track running. The document also examines composition and safety considerations for supercapacitors and references future work.