Science· 2012Q1
Laser Scribing of High-Performance and Flexible Graphene-Based Electrochemical Capacitors
- 3,985citations
- Q1SCImago
- 2012year
Short summary
A standard DVD laser can directly scribe graphite oxide films into graphene electrodes, creating mechanically robust, highly conductive (1738 S/m) materials for supercapacitors.
AI-generated from the title and abstract; the full text is not read.
Key points
- A standard DVD laser is used to directly convert graphite oxide to graphene electrodes.
- Graphene films exhibit high electrical conductivity (1738 S/m) and surface area (1520 m²/g).
- Electrodes are mechanically robust and do not require binders or current collectors.
- Resulting supercapacitors show ultrahigh energy density with high power and stability, even when flexed.
AI-generated from the title and abstract; the full text is not read.
Abstract
Although electrochemical capacitors (ECs), also known as supercapacitors or ultracapacitors, charge and discharge faster than batteries, they are still limited by low energy densities and slow rate capabilities. We used a standard LightScribe DVD optical drive to do the direct laser reduction of graphite oxide films to graphene. The produced films are mechanically robust, show high electrical conductivity (1738 siemens per meter) and specific surface area (1520 square meters per gram), and can thus be used directly as EC electrodes without the need for binders or current collectors, as is the case for conventional ECs. Devices made with these electrodes exhibit ultrahigh energy density values in different electrolytes while maintaining the high power density and excellent cycle stability of ECs. Moreover, these ECs maintain excellent electrochemical attributes under high mechanical stress and thus hold promise for high-power, flexible electronics.
The authors' abstract, as published at the source. Science, 2012 · DOI ↗
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Field: Electronic, Optical and Magnetic Materials
Electronic, Optical and Magnetic MaterialsMaterials Science