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Micromachines 2018, 9(8), 399; https://doi.org/10.3390/mi9080399

On-Chip Asymmetric Microsupercapacitors Combining Reduced Graphene Oxide and Manganese Oxide for High Energy-Power Tradeoff

1
Department of Mechanical and Materials Engineering, Florida International University, Miami, FL 33174, USA
2
Center for the Study of Matter of Extreme Conditions (CeSMEC), Florida International University, Miami, FL 33199, USA
*
Author to whom correspondence should be addressed.
Received: 12 July 2018 / Revised: 7 August 2018 / Accepted: 10 August 2018 / Published: 12 August 2018
(This article belongs to the Special Issue Atomic Scale Materials for Electronic and Photonic Devices)
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Abstract

Given the rapid miniaturization of technology, it is of interest to produce viable on-chip micro-electrochemical energy storage systems. In this study, interdigitated asymmetric microsupercapacitors were fabricated using photolithography, lift-off and electrodeposition methods. Manganese oxide (MnOx) and reduced graphene oxide (rGO) comprised the pseudocapacitive and the double layer component, respectively. Symmetric MnOx//MnOx, rGO//rGO as well as asymmetric rGO//MnOx microsupercapacitors with three different MnOx thicknesses were constructed and characterized in aqueous media. The asymmetric microsupercapacitor with the intermediate MnOx film thickness displayed the optimal energy-power trade-off superior to that of both the symmetric and well as the other asymmetric configurations. The optimal microsupercapacitor exhibited a high stack energy density of 1.02 mWh·cm−3 and a maximal power density of 3.44 W·cm−3. The high energy-power trade-off of the device is attributed to the synergistic effects of utilizing double layer and pseudocapacitive charge storage mechanisms along with in-plane interdigital microelectrode design within one optimized micro-device. View Full-Text
Keywords: asymmetric electrochemical capacitors; interdigitated microsupercapacitors; electrophoretic deposition; reduced graphene oxide; manganese oxide asymmetric electrochemical capacitors; interdigitated microsupercapacitors; electrophoretic deposition; reduced graphene oxide; manganese oxide
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Agrawal, R.; Wang, C. On-Chip Asymmetric Microsupercapacitors Combining Reduced Graphene Oxide and Manganese Oxide for High Energy-Power Tradeoff. Micromachines 2018, 9, 399.

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