Issue 11, 2019

Selective integration of hierarchical nanostructured energy materials: an effective approach to boost the energy storage performance of flexible hybrid supercapacitors

Abstract

High energy density, fast charge–discharge capability, high flexibility, and sustained cycle life are the key challenges in the application of flexible supercapacitors (SCs) in modern electronics. These primary requirements could be accomplished by engineering a new class of current collectors consisting of hierarchical combinations of various active materials. This study reports the selective integration of hierarchical Ni(OH)2 nanoneedle arrays with NiO–NiCo2O4 nanosheet arrays (Ni(OH)2 NNAs@NiO–NiCo2O4 NSAs) on flexible fabric for high-performance electrodes. The novel core–shell-like hetero-nanoarchitectures not only enhance the electrochemical activity and specific surface area but also, more importantly, provide superhighways for the ultrafast transport of electrons and ions. As a battery-type material, the core–shell-like Ni(OH)2 NNAs@NiO–NiCo2O4 NSAs display a high specific capacity of 326.7 mA h g−1 at 2 A g−1 in aqueous 3 M KOH; this value is 1.89, 1.23 and 1.14 times those of NiO–NiCo2O4, NiO@NiO–NiCo2O4 and Co3O4@NiO–NiCo2O4 electrodes, respectively. Most importantly, a flexible hybrid SC (FHSC, Ni(OH)2 NNAs@NiO–NiCo2O4 NSAs//graphene-ink) demonstrates a superhigh energy density of 97.1 W h kg−1 and a superior long cycling lifespan with 94.7% retention over 5000 cycles. Utilizing these excellent energy storage properties, the fabricated FHSC operated a multifunction electronic display and light up different colored light emitting diodes for real-time applications.

Graphical abstract: Selective integration of hierarchical nanostructured energy materials: an effective approach to boost the energy storage performance of flexible hybrid supercapacitors

Supplementary files

Article information

Article type
Paper
Submitted
29 Ker. 2018
Accepted
13 Cʼhwe. 2019
First published
13 Cʼhwe. 2019

J. Mater. Chem. A, 2019,7, 6374-6386

Selective integration of hierarchical nanostructured energy materials: an effective approach to boost the energy storage performance of flexible hybrid supercapacitors

Chandu V. V. Muralee Gopi, P. J. Singh Rana, R. Padma, R. Vinodh and H. Kim, J. Mater. Chem. A, 2019, 7, 6374 DOI: 10.1039/C8TA12508B

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements