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Issue 29, 2018
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Enriched carbon dots/graphene microfibers towards high-performance micro-supercapacitors

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Methods allowing high-performance fiber-shaped micro-supercapacitors (micro-SCs) to be produced in a controllable manner are potentially important for portable and wearable electronics. Currently, their low energy density and mechanical strength pose critical challenges for fiber-shaped SCs, which severely discourages their practical applications. Herein, we propose a new dot-sheet structured integration of carbon dots (CDs) with graphene to construct high-performance CDs/graphene fiber-based micro-SCs via a microfluidic strategy. The micro-SCs produced using solid-state acid and organic electrolytes show great enhancement in energy storage abilities, including larger capacitance (area specific capacitance, 607 mF cm−2; mass specific capacitance, 91.9 F g−1), long-term bending durability (2000 cycles) and high energy densities (67.37 μW h cm−2). Their remarkable performance results from dot-sheet structured electrodes with larger specific-surface-area (SSA, 435.1 m2 g−1), more ionic channels (average pore size of 2.5 nm) and high mechanical strength, creating a highly effective utilization ratio of SSA (96%) for faster and greater ion accumulation. Additionally, CDs also contribute 22.1% of the improvement to capacitance. Based on these superior achievements, we utilize micro-SCs to power CD-based white LEDs, a smart watch and miniaturized traffic lights, which will guide the development of the next generation of wearable electronics.

Graphical abstract: Enriched carbon dots/graphene microfibers towards high-performance micro-supercapacitors

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Publication details

The article was received on 06 Mar 2018, accepted on 03 Apr 2018 and first published on 05 Apr 2018

Article type: Paper
DOI: 10.1039/C8TA02124D
Citation: J. Mater. Chem. A, 2018,6, 14112-14119
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    Enriched carbon dots/graphene microfibers towards high-performance micro-supercapacitors

    Q. Li, H. Cheng, X. Wu, C. Wang, G. Wu and S. Chen, J. Mater. Chem. A, 2018, 6, 14112
    DOI: 10.1039/C8TA02124D

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