In-plane flexible solid-state microsupercapacitors for on-chip electronics

doi:10.1016/j.energy.2018.12.184

2019-03-01

PRE

DOI：10.1016/j.energy.2018.12.184

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Small-scale supercapacitors or microsupercapacitors (MSCs) can be integrated with miniaturized electronics to work as stand-alone power sources, or as efficient energy storage units coupling with energy harvesters to realize self-powered microdevices. Despite many advances, research and development of MSCs are still in their infancy. In this work, in-plane flexible solid-state MSCs based on interdigital electrodes are developed through a facile, cost-effective, universal and industrially applicable protocol, i.e. screen printing technique. To verify the generality of such method, activated carbon (AC) nanospheres and molybdenum oxide (MoO3-x) nanorods as representative electrical double-layer capacitive material and intercalation pseudocapacitive material are used as the electrode active material, respectively. Using a highly viscous AC nanosphere or MoO3-x nanorod paste, shape-designable microelectrodes with an effective area of 0.415 cm(2), and a spacing of 250 mu m between the two electrode fingers are printed on flexible substrate in several seconds. The MSCs can deliver high areal capacitances and energy densities (5.04 mF cm(-2) and 0.7 mu Wh cm(-2) for the MSC with AC nanosphere electrodes, 41.7 mF cm(-2) and 5.8 mu Wh cm(-2) for the MSC with MoO3-x nanorod electrodes), own excellent rate capability and long cycle life for both the electric double-layer capacitive material and pseudocapacitive material. This work demonstrates the opportunity and practicability for developing MSCs for flexible on-chip electronic devices. (C) 2018 Elsevier Ltd. All rights reserved.

Keyword:

Microsupercapacitor

Interdigital electrodes

Screen printing

Activated carbon nanospheres

Molybdenum oxide nanorods

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Energy

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9.4

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4.3W

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20.2W

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