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Hierarchical ultrathin NiAl layered double hydroxide nanosheet arrays on carbon nanotube paper as advanced hybrid electrode for high performance hybrid capacitors

Title
Hierarchical ultrathin NiAl layered double hydroxide nanosheet arrays on carbon nanotube paper as advanced hybrid electrode for high performance hybrid capacitors
Author
이해원
Keywords
Layered double hydroxide; Hybrid supercapacitor; Carbon nanotube paper; Porous graphene; Power density
Issue Date
2017-10
Publisher
ELSEVIER SCIENCE SA
Citation
CHEMICAL ENGINEERING JOURNAL, v. 325, page. 554-563
Abstract
To effectively improve the power density and rate capability of layered double hydroxide (LDH) based supercapacitors, a hybrid supercapacitor (HSC) comprising of hierarchical ultrathin NiAl-LDH nanosheet arrays on carbon nanotube paper (CNP-LDH) is developed with porous graphene nanosheets as the negative electrode for the first time. SEM image shows that hierarchical NiAI LDH nanosheet arrays are assembled by numerous ultrathin nanosheets with thickness of a few to tens of nanometers. Remarkably, with an operating voltage of 1.6 V, the HSC possesses a high energy density of 50.0 Wh kg(-1) at an average power density of 467 W kg(-1). Even at a fast discharging time of 3.9 s, a high energy density (23.3 Wh kg(-1)) could also be retained at a power density of 21.5 kW kg(-1). Moreover, the HSC exhibits cycling stability with a retention rate of 78% after 5000-cycle charge-discharge test at 5 A g(-1). The results inspire us to propose our high-performance CNP-LDH as a promising electrode for energy storage applications. (C) 2017 Published by Elsevier B.V.
URI
https://www.sciencedirect.com/science/article/pii/S1385894717308549?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/115935
ISSN
1385-8947; 1873-3212
DOI
10.1016/j.cej.2017.05.101
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > CHEMISTRY(화학과) > Articles
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