Sp3-rich Porous Carbon for Doublet Layer Supercapacitors

Abstract

Abstract Efficient utilization of alternative energies hinges on the performance and cost of energy storage systems. In the foreseeable future, supercapacitors remain the most promising option for many energy storage applications. But their widespread use is limited by their low energy storage density and relatively high effective series resistance. To date, however, the highest energy density of a carbon-based solid-state supercapacitor is limited up to 139 Wh kg− 1. Here, we report our findings in the synthesis of a sp3 -rich carbon through a simple, one-step process and direct insertion of pyridinic and graphitic nitrogen in an NH3 atmosphere at -780C. Further, the hetero atom doped sp3 -rich carbon materials-based doublet layer supercapacitors with ordered architecture and shorter diffusion path & lower resistance, demonstrated excellent energy density (218.4 Wh kg− 1) with excellent cycling stability. This simple approach to low-cost carbonaceous materials with unique architecture and functionality could be a promising alternative to fabrication of hetero atom doped carbon structures for making next generation high capacitive batteries and hence, high energy storage device.