21February2017

Nano-Micro Letters

3D Hierarchical Co-Al Layered Double Hydroxides with Long-term Stabilities and High Rate Performances in Supercapacitors

Jiantao Zai, Yuanyuan Liu, Xiaomin Li, Zi-feng Ma, Rongrong Qi*, Xuefeng Qian*

Abstract
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Nano-Micro Lett. (2017) 9: 21

Published Online: 27 December 2016 (Article)

DOI: 10.1007/s40820-016-0121-5

 

Abstract

 


abstract

Three-dimensional (3D) flower-like Co-Al layered double hydroxide (Co-Al-LDH) architectures composed of atomically thin nanosheets were successfully synthesized via a hydrothermal method in a mixed solvent of water and butyl alcohol. Owing to the unique hierarchical structure and modification by butyl alcohol, the electrochemical stability and the charge/mass transport of the Co-Al-LDHs was improved. When used in supercapacitors, the obtained Co-Al-LDHs deliver a high specific capacitance of 838 F g-1 at a current density of 1 A g-1 and excellent rate performance (753 F g-1 at 30 A g-1 and 677 F g-1 at 100 A g-1), as well as excellent cycling stability with 95 % retention of the initial capacitance even after 20,000 cycles at a current density of 5 A g-1. This work provides a promising alternative strategy to enhance the electrochemical properties of supercapacitors.


 

Keywords

Co-Al layered double hydroxides (Co-Al-LDHs); Nanosheets; 3D hierarchical architectures; Butyl alcohol; Supercapacitors

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