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High Power Interdigitated Carbon Nanotube Based Micro-Capacitors

Published online by Cambridge University Press:  23 January 2017

Michael Spencer ,
Kofi Adu ,
Ramakrishnan Rajagopalan  and
Clive Randall
Michael Spencer
Affiliation:
Department of Materials Science and Engineering, Penn State, University Park, PA 16802, U.S.A.
Kofi Adu*
Affiliation:
Materials Research Institute, Penn State, University Park, PA 16802, U.S.A. Department of Physics, Penn State – Altoona, Altoona, PA 16601, U.S.A.
Ramakrishnan Rajagopalan
Affiliation:
Department of Engineering Science and Mechanics, Penn State, University Park, PA 16802, U.S.A. Department of Engineering, Penn State DuBois, PA 15801, U.S.A.
Clive Randall
Affiliation:
Department of Materials Science and Engineering, Penn State, University Park, PA 16802, U.S.A. Materials Research Institute, Penn State, University Park, PA 16802, U.S.A.
*
*(Email: [email protected])
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Abstract

Micro-scale energy storage devices are of great importance to the advancement of low maintenance, high power electronics. They can easily be used in applications that extract energy from mechanical, solar, thermal and thermoelectric sources. Several of these devices have achieved mean areal capacitance of 1.5 mF cm-2 and maximal energy and power densities of 6.6 mJ cm-2 and 44.9 mW cm-2, respectively. It has been demonstrated that a smaller interspace enhances the performance. Currently, these types of devices are only made possible by using several micro-fabrication steps and techniques that are cost prohibitive and limit the larger scale manufacturability. We present a simple but highly scalable and cost effective method in fabricating high power interdigitated micro energy storage devices using binder-free carbon nanotubes membranes and laser irradiation to obtain interspaces on the order of 75 μm. The binder-free electrode devices show higher power density and an improved frequency response, compared to what has been reported in the literature. Additionally, we observed significant reduction in cell resistance leading to enhancement in cell capacitance, and consequently, an increase in energy density.

Keywords

energy storagenanoscalenanostructure
Type
Articles
Information
MRS Advances , Volume 2 , Issue 7: Electrochemistry , 2017 , pp. 413 - 418
Copyright
Copyright © Materials Research Society 2017 

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References

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