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New strategy for integrating superior mechanical performance and high volumetric energy density into Janus graphene film for wearable solid-state supercapacitor

Abstract

Integrating the contradictory attributes of well-aligned pore structure and excellent electrical/mechanical properties into graphene-based macroscopic materials perfectly for wearable and portable electronics and energy devices is still a big challenge hitherto. In this work, a simple yet high-efficient reduction and evaporation co-induced self-assembly (RES) method is successfully developed to prepare self-crosslinking Janus graphene films with well-aligned pore and densely shell structure, which endow the material excellent electrical conductivity and good mechanical property. Electrochemical studies demonstrate that the graphene films with a thickness of 12.4 μm exhibit an extraordinary volumetric capacitance of 127.7 F cm-3 at the current density of 0.5 mA cm-2, which are superior to most of previous reports. The flexible all-solid state supercapacitor based on the Janus graphene films contributes an ultrahigh energy density of 2.78 mWh cm-3 at 40.3 mW cm-3 as well as a remarkable cycling performance (95.5% retention of its initial capacitance after 10 000 cycles at 2 mA cm-2). The fatigue tests further confirm the preferable flexibility, bendable and foldable performances of our supercapacitor, which are crucial factors for further wearable applications. These tough and durable supercapacitor devices connected in series have been successfully well-designed into wearable energy storage systems to power small gadgets, e.g., an electronic watch and a light-emitting diode. In addition, the formation of microgels during the film preparation process is helpful for engraving the microgel films into micro-supercapacitor patterns, which can work as an integrated photodetection system. It is of great significance for this strategy in potential applications towards designing and fabricating new flexible and portable graphene-based wearable electronic devices.

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Supplementary files

Publication details

The article was received on 12 Jul 2017, accepted on 11 Sep 2017 and first published on 12 Sep 2017


Article type: Paper
DOI: 10.1039/C7TA06040H
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    New strategy for integrating superior mechanical performance and high volumetric energy density into Janus graphene film for wearable solid-state supercapacitor

    Z. Song, Y. Fan, Z. Sun, D. Han, Y. Bao and L. Niu, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA06040H

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