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Controllable preparation of hydrangea-shaped CoAl-LDHs/CoF2 composite for supercapacitor electrode with superior performance.

Authors :
Bai, Xue
Sun, Fengyi
Ma, LiYan
Shen, Jyunhong
Jiang, Zhuwu
Xu, Dongdong
Pan, Chuntao
Di, Hongcheng
Zhang, Hongyu
Source :
Ionics; Jun2024, Vol. 30 Issue 6, p3577-3586, 10p
Publication Year :
2024

Abstract

Exploring the method for rational design of hierarchical structures such as hollow, sphere, and core–shell structures is a crucial challenge for enhancing the electrochemical performance of supercapacitor electrodes. In this study, we demonstrate a facile method for controllable preparation of hydrangea-shaped CoAl-LDHs/CoF<subscript>2</subscript> composite and used as a positive electrode for supercapacitor. A series of contrast tests are performed to select optimal experiment condition. CoAl-LDHs obtained at a metal ratio of 2:1, reacting 8 h with the addition of NH<subscript>4</subscript>F, display optimal performance associated with the hierarchical structure, where NH<subscript>4</subscript>F plays a vital role in regulating this uniform generation process. The fabricated working electrode shows a high specific capacitance of 827.8 Fg<superscript>−1</superscript>, with excellent capacitance retention of 62.8% after current density increases ten times. At last, an asymmetric supercapacitor using C2A1-8 h sample as positive electrode and activated carbon as negative electrode is assembled and delivers an outstanding energy density of 53.7 Wh kg<superscript>−1</superscript> at a power density of 239.9 kW kg<superscript>−1</superscript>, and energy density reaches 27.8 Wh kg<superscript>−1</superscript> at maximum power density of 12,000 W kg<superscript>−1</superscript>, indicating C2A1-8 h is a potential candidate for energy storage and conversion systems. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
09477047
Volume :
30
Issue :
6
Database :
Complementary Index
Journal :
Ionics
Publication Type :
Academic Journal
Accession number :
178276171
Full Text :
https://doi.org/10.1007/s11581-024-05520-6