Issue 31, 2014

Nanosheet-assembled 3D nanoflowers of ruthenium oxide with superior rate performance for supercapacitor applications

Abstract

Nanosheet-assembled 3D nanoflowers of ruthenium oxide were prepared by a microwave-hydrothermal process without using a template. The 3D nanoflowers consisted of interconnected spheres and had sizes of 250–300 nm. The mechanism of formation of the nanosheet-assembled 3D nanoflowers was determined on the basis of experimental evidence. The specific capacitance of an electrode based on these 3D nanoflowers was calculated and found to be 545.2 F g−1 at a discharging current density of 0.5 A g−1. The unique morphology of the nanoflowers allows H+ ions greater electrochemical access to the pores of the active RuO2 matrix, leading to a high specific capacitance. Moreover, the specific capacitance of the electrode decreased by only 8.6% (from 545.2 to 498.2 F g−1) as the discharging current density was increased from 0.5 to 50 A g−1, indicating its excellent rate capability. This superior rate capability could also be attributed to the porous nature of the nanoflowers. The excellent electrochemical properties of the 3D nanoflowers make them an attractive material for use in electrochemical capacitors.

Graphical abstract: Nanosheet-assembled 3D nanoflowers of ruthenium oxide with superior rate performance for supercapacitor applications

Supplementary files

Article information

Article type
Paper
Submitted
05 Feb 2014
Accepted
17 Mar 2014
First published
17 Mar 2014

RSC Adv., 2014,4, 16115-16120

Author version available

Nanosheet-assembled 3D nanoflowers of ruthenium oxide with superior rate performance for supercapacitor applications

J. Kim, K. Kim, H. Kim, S. Park, K. Y. Chung and K. Kim, RSC Adv., 2014, 4, 16115 DOI: 10.1039/C4RA01010H

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