Jump to main content
Jump to site search


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

Author affiliations

Abstract

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

Back to tab navigation

Supplementary files

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, Advance Article
  •   Request permissions

    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, Advance Article , DOI: 10.1039/C8TA02124D

Search articles by author

Spotlight

Advertisements