Scalable fabrication of high-power graphene micro-supercapacitors for flexible and on-chip energy storage
2013; Nature Portfolio; Volume: 4; Issue: 1 Linguagem: Inglês
10.1038/ncomms2446
ISSN2041-1723
AutoresMaher F. El‐Kady, Richard B. Kaner,
Tópico(s)Advancements in Battery Materials
ResumoThe rapid development of miniaturized electronic devices has increased the demand for compact on-chip energy storage. Microscale supercapacitors have great potential to complement or replace batteries and electrolytic capacitors in a variety of applications. However, conventional micro-fabrication techniques have proven to be cumbersome in building cost-effective micro-devices, thus limiting their widespread application. Here we demonstrate a scalable fabrication of graphene micro-supercapacitors over large areas by direct laser writing on graphite oxide films using a standard LightScribe DVD burner. More than 100 micro-supercapacitors can be produced on a single disc in 30 min or less. The devices are built on flexible substrates for flexible electronics and on-chip uses that can be integrated with MEMS or CMOS in a single chip. Remarkably, miniaturizing the devices to the microscale results in enhanced charge-storage capacity and rate capability. These micro-supercapacitors demonstrate a power density of ~200 W cm-3, which is among the highest values achieved for any supercapacitor.
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