Issue 24, 2019

Asymmetric supercapacitors with high energy densities

Abstract

The low energy densities of supercapacitors (SCs) are generally limited by the used anodes. To develop SCs with high energy densities, Fe3+ modified V2O5@GQDs (m-V2O5@GQDs) and ZIF-67-derived nanoporous carbon loaded with Mn3O4 (C/N-Mn3O4) were synthesized. After their detailed characterization using electron microscopy, X-ray methods and electrochemical techniques, they were further utilized as the anode and the cathode, respectively, to construct asymmetric supercapacitors (ASCs). The as-synthesized m-V2O5@GQDs improve the poor conductivity of V2O5, contributing greatly to a specific capacitance of 761 F g−1 at a current density of 2 A g−1. With application of a cell voltage of 2 V, an energy density of up to 99.4 W h kg−1 is achieved at a power density of 1000 W kg−1. Such ASCs also exhibit outstanding cycling performance (95% of initial capacitance even after 10 000 charging/discharging cycles). This study thus provides a new way to design and construct ASCs with high energy densities.

Graphical abstract: Asymmetric supercapacitors with high energy densities

  • This article is part of the themed collection: Nanocarbons

Supplementary files

Article information

Article type
Paper
Submitted
26 3 2019
Accepted
13 5 2019
First published
24 5 2019

Nanoscale, 2019,11, 11946-11955

Asymmetric supercapacitors with high energy densities

Z. Shi, W. Chu, Y. Hou, Y. Gao and N. Yang, Nanoscale, 2019, 11, 11946 DOI: 10.1039/C9NR02607J

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