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Size-Dependent Synthesis of Hollow Co3O4 Nanocubes Derived from Co-Fe PBA as Battery-Type Electrode Materials for Hybrid Supercapacitors.

Authors :
Zhiling Peng
Wenqi Wang
Heming Zhao
Juncheng Qi
Huifang Zhang
Chungui Zhou
Bing Yan
Zepeng Zhang
Source :
Journal of The Electrochemical Society; Aug2021, Vol. 168 Issue 8, p430-438, 9p
Publication Year :
2021

Abstract

Hollow nanostructures with enlarged surface areas are highly attractive electrode materials for supercapacitors. In this work, the size-dependent synthesis of hollow Co<subscript>3</subscript>O<subscript>4</subscript> nanocubes via a facile ionic exchange reaction between Co-Fe Prussian blue analogues (PBAs) and alkali solution is reported. By adjusting the concentration of sodium citrate to control the reaction kinetics during nucleation and growth, four different sizes of Co-Fe PBAs were synthesized. It was also found that a Co-Fe PBA of about 140 nm can be easily converted into a well-defined internal hollow structure, while Co-Fe PBAs with smaller or larger sizes are challenged in generating a hollow structure. Benefitting from the inner voids and thin shell architecture, the derived hollow Co<subscript>3</subscript>O<subscript>4</subscript> nanocubes exhibit a high specific capacity of 296.6C cm<superscript>-2</superscript> at 2 mA cm<superscript>-2</superscript>, and a rate capability of 64.5% when the current density is increased to 60 mA cm<superscript>-2</superscript>. Furthermore, a hybrid supercapacitor (HSC) was fabricated with hollow Co<subscript>3</subscript>O<subscript>4</subscript> nanocubes as the cathode and activated carbon as the anode, respectively. The HSC provided a maximum energy density of 14.1 Wh kg<superscript>-1</superscript> at 464.7 W kg<superscript>-1</superscript>. Moreover, it retained the excellent cycling stability of 85.7% of the original capacity over 5000 continuous charging and discharging processes. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00134651
Volume :
168
Issue :
8
Database :
Supplemental Index
Journal :
Journal of The Electrochemical Society
Publication Type :
Academic Journal
Accession number :
152416179
Full Text :
https://doi.org/10.1149/1945-7111/ac2020