Vertical-Channeled Graphene Oxide/Cellulose Composite Flexible Electrodes

Supercapacitors have emerged as a significant technology for energy transmission, offering an alternative to traditional energy storage devices with the ability to provide a high power supply and life. However, their application and development have been hindered by tension between flexibility, self-support, and high energy density. In this study, cellulose was utilized as the primary raw material with graphene oxide (GO) employed as the filler. Through careful regulation of morphological control using radial freeze casting, the electrode exhibited both longitudinally and radially vertical-channeled porosity structure, resulting in a remarkable areal capacitance of 463 mF cm–2 at a current density of 1 A cm–2. Additionally, the constructed all-solid-state symmetric supercapacitor exhibited a high energy density of 49.7 μWh cm–2 at a power density of 500 μW cm–2. This research paves the way for more flexible and lightweight supercapacitors with the potential for long-term performance in energy storage applications.