Concepedia

Supercapacitor Devices Based on Graphene Materials

Yan Wang, Zhiqiang Shi, Yi Huang, Yanfeng Ma, Chengyang Wang, Mingming Chen, Yongsheng Chen

The Journal of Physical Chemistry C · 2009 · 2.5K citations · 39 references

TL;DR

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.