Issue 42, 2018

Terephthalate-based cobalt hydroxide: a new electrode material for supercapacitors with ultrahigh capacitance

Abstract

Searching for new electrode materials is one of the key tasks in developing high-performance supercapacitors. In this work, as a layered hydroxyl derivative, terephthalate-based cobalt hydroxide, Co2(OH)2(C8H4O4), is successfully prepared in situ on nickel foam through a simple hydrothermal route. The scanning electron microscopy results reveal that the products are composed of massive double-blade lath crystals grown along the a-axis. The as-obtained Ni-foam-supported Co2(OH)2(C8H4O4) is directly used as the positive electrode of supercapacitors without further treatment. The resulting Co2(OH)2(C8H4O4) electrode exhibits ultrahigh charge storage capacity with the specific capacity of 9.36 C cm−2 (1261 C g−1) at a current density of 10 mA cm−2 (0.5 A g−1) and good cycling stability with the capacity retention of 82.4% over 5000 cycles at a current density of 50 mA cm−2. In combination with activated carbon as the negative electrode in 3 M KOH aqueous electrolyte, the constructed asymmetric supercapacitor delivers a high energy density of 30.62 W h kg−1 at a power density of 221 W kg−1 within a voltage window of 1.5 V. These encouraging electrochemical performances enable the developed terephthalate-based cobalt hydroxide to be a promising electrode material for supercapacitor applications.

Graphical abstract: Terephthalate-based cobalt hydroxide: a new electrode material for supercapacitors with ultrahigh capacitance

Supplementary files

Article information

Article type
Paper
Submitted
07 Aug 2018
Accepted
20 Sep 2018
First published
26 Sep 2018

Dalton Trans., 2018,47, 14958-14967

Terephthalate-based cobalt hydroxide: a new electrode material for supercapacitors with ultrahigh capacitance

X. Ou, Y. Wang, S. Lei, W. Zhou, S. Sun, Q. Fu, Y. Xiao and B. Cheng, Dalton Trans., 2018, 47, 14958 DOI: 10.1039/C8DT03231A

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