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High power density supercapacitors using locally aligned carbon nanotube electrodes

Chunsheng Du1, Jeff Yeh2 and Ning Pan1,3

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A new form of thin films formed by multi-walled carbon nanotubes exhibiting high packing density and local alignment were fabricated using a highly concentrated colloidal suspension of carbon nanotubes. Electrical double layer capacitors built from these film electrodes exhibited a close to rectangular cyclic voltammogram even at a high scan rate of 1000 mV s−1, and produced very high specific power density of about 30 kW kg−1, ideal for surge-power delivery applications. The preparation procedure is very simple, and does not require any binders. It has potential for highly efficient manufacturing of high power density supercapacitors and other similar electronic devices.


PACS

82.70.Dd Colloids

82.45.Fk Electrodes

82.45.Mp Thin layers, films, monolayers, membranes

82.47.Uv Electrochemical capacitors; supercapacitors

81.07.De Nanotubes

82.45.Yz Nanostructured materials in electrochemistry

82.70.Kj Emulsions and suspensions

Subjects

Soft matter, liquids and polymers

Surfaces, interfaces and thin films

Nanoscale science and low-D systems

Chemical physics and physical chemistry

Dates

Issue 4 (April 2005)

Received 19 October 2004

Published 1 February 2005



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