Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 4, Issue 24, Pages 9502-9510Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta02219g
Keywords
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Funding
- Innovation Funding of HUST for International Collaborations [2014ZZGH018]
- National Nature Science Foundation of China [51371084, 91545131]
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Flexible, wearable, implantable and easily reconfigurable micro-fabricated pseudocapacitors with impressive volumetric stack capacitance and energy densities are desired for electronic devices. In this work, scratching technology at the micron-scale enables construction of the planar electrode systems directly based on nanoporous gold films. We demonstrate that both nanoporous channels with high ion-accessible ability and interconnected skeletons with high conductivity enable the design of pseudocapacitive micro-supercapacitors with high performances. These planar devices show several attractive features including ultrafast charge/discharge (high rate), large capacitance (1.27 mF cm(-2), 127 F cm(-3)), and ultrahigh energy density (0.045 W h cm(-3)) while maintaining a high power density (22.21 W cm(-3)). Especially, the superb cyclability and mechanical flexibility give them great potential for future microelectronics with a tiny volume. The design concept reported here provides an avenue to integrate planar micro-supercapacitors into large-scale devices with a small environmental footprint.
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