Supercapacitor Devices Based on Graphene Materials

TLDR

Graphene materials have been explored as supercapacitor electrode materials. They are prepared from graphene oxide sheets and reduced with gas‑based hydrazine to restore conductivity. The devices achieved a maximum specific capacitance of 205 F g⁻¹, power density of 10 kW kg⁻¹, energy density of 28.5 Wh kg⁻¹, and retained ~90 % capacitance after 1200 cycles, underscoring their commercial promise.

Abstract

Graphene materials (GMs) as supercapacitor electrode materials have been investigated. GMs are prepared from graphene oxide sheets, and subsequently suffer a gas-based hydrazine reduction to restore the conducting carbon network. A maximum specific capacitance of 205 F/g with a measured power density of 10 kW/kg at energy density of 28.5 Wh/kg in an aqueous electrolyte solution has been obtained. Meanwhile, the supercapacitor devices exhibit excellent long cycle life along with ∼90% specific capacitance retained after 1200 cycle tests. These remarkable results demonstrate the exciting commercial potential for high performance, environmentally friendly and low-cost electrical energy storage devices based on this new 2D graphene material.