期刊
JOURNAL OF ENERGY STORAGE
卷 50, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.est.2022.104667
关键词
Aqueous asymmetric supercapacitors; CoMn-LDH; High specific capacitance; High energy density; Long cycle stability
资金
- Natural Science Foundation of Gansu Province, China [20JR10RA611]
- Fundamental Research Funds for the Central Universities, China [lzujbky-2021-sp54]
This study reports a high-performance and self-standing supercapacitor electrode composed of CoMn-LDH nanostructure on NF. The electrode exhibits excellent capacitance, rate performance, and cycle stability, indicating its promising potential for high-performance energy storage applications.
In this work, we report a high-performance and self-standing supercapacitor electrode composed of a Co and Mn layered double hydroxide (CoMn-LDH) nanostructure on Ni foam (NF) prepared by one-step electrochemical deposition. The CoMn-LDH electrode delivers a high capacitance of-2673.6 F g(-1) at 1 A g(-1), with the excellent rate performance (-1488.0 F g(-1) at 60 A g(-1)) and good cycle stability (-86.7% capacitance retention after 5000 cycles at 12 A g(-1)). The asymmetric supercapacitors assembled using the cathode of CoMn-LDH, the anode of activated carbon on carbon cloth and the electrolyte of 2.0 M KOH yield an energy density of-97.5 W h kg(-1) at 800.0 W kg(-1), good cycling performance of-89.2% capacitance retention after 5000 cycles at 5 A g(-1) with the Columbic efficiency around 100%. These results indicate that the CoMn-LDH nanostructure on NF is a promising electrode for high-performance energy storage applications.
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