Ultrathin Planar Graphene Supercapacitors

Abstract

With the advent of atomically thin and flat layers of conducting materials such as graphene, new designs for thin film energy storage devices with good performance have become possible. Here, we report an "in-plane" fabrication approach for ultrathin supercapacitors based on electrodes comprised of pristine graphene and multilayer reduced graphene oxide. The in-plane design is straightforward to implement and exploits efficiently the surface of each graphene layer for energy storage. The open architecture and the effect of graphene edges enable even the thinnest of devices, made from as grown 1-2 graphene layers, to reach specific capacities up to 80 μFcm(-2), while much higher (394 μFcm(-2)) specific capacities are observed multilayer reduced graphene oxide electrodes. The performances of devices with pristine as well as thicker graphene-based structures are examined using a combination of experiments and model calculations. The demonstrated all solid-state supercapacitors provide a prototype for a broad range of thin-film based energy storage devices.

Scalable fabrication of high-power graphene micro-supercapacitors for flexible and on-chip energy storage

“…Although promising, the sandwich structure of these supercapacitors limits their integration into electronic circuits. Yoo et al 16 observed a marked increase in the specific capacitance of graphene supercapacitors when made in a planar structure. Later, this research group developed a process for the direct writing of planar graphene micro-supercapacitors through the laser reduction and pattering of hydrated graphite oxide (GO) films 17 .…”

Single‐Crystalline Rhodium Nanosheets with Atomic Thickness

“…The atomically thick 2D nanomaterials show great promises in designing practical applications such as flexible and transparent electronic devices,7, 8 high‐performance in‐plane supercapacitor electrodes,9, 10, 11 and high‐efficiency catalysts 12, 13, 14. Considering the potential of outperforming their bulk counterparts, great efforts have been made to fabricate atomically thick 2D nanosheets.…”

Transparent, flexible, and solid-state supercapacitors based on graphene electrodes

“…[15][16][17][18][19][20] However, very few studies have been conducted to use graphene for optically transparent and mechanically flexible supercapacitors. 14,15 In addition, the electrochemical stability during mechanical deformation of supercapacitors has not been considered in the past.…”