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Lee, Damin, Mathur, Sanjay and Kim, Kwang Ho (2021). Bilayered NiZn(CO3)(OH)(2)-Ni-2(CO3)(OH)(2) nanocomposites as positive electrode for supercapacitors. Nano Energy, 86. AMSTERDAM: ELSEVIER. ISSN 2211-3282

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Abstract

Open architecture and porous NiZn(CO3)(OH) 2-Ni-2(CO3)(OH)(2) bilayers were fabricated on a nickel foam substrate through a two-step processing of Ni and Zn salts under hydrothermal conditions. The initial layer of NiZn (CO3)(OH)(2) nanosheets, obtained by alkaline hydrolysis of nickel and zinc salts, was cladded with a top layer consisting of Ni-2(CO3)(OH)(2) nanowire arrays. This double-decker arrangement offered a higher mechanical stability and enhanced electrochemical performance in NiZn(CO3)(OH)(2)-Ni-2(CO3)(OH)(2) electrodes, which showed an excellent maximum specific capacitance of 1168.8 F g(-1) at 3 A g(-1) and superior cycling stability with a capacity retention of similar to 85.7% after 5000 cycles. Moreover, the asymmetric two-layered NiZn(CO3) (OH)(2)-Ni-2(CO3)(OH)(2)//graphene electrodes provided sufficient capacitive energy to turn on a LED light. This superior electrochemical performance is attributed to the hierarchical architecture and large surface area of the composite electrodes that render them in view of facile and scalable synthesis and greater cycling safety as promising candidates for practical applications.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Lee, Damin UNSPECIFIED UNSPECIFIED UNSPECIFIED Mathur, Sanjay UNSPECIFIED UNSPECIFIED UNSPECIFIED Kim, Kwang Ho UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-577415
DOI:	10.1016/j.nanoen.2021.106076
Journal or Publication Title:	Nano Energy
Volume:	86
Date:	2021
Publisher:	ELSEVIER
Place of Publication:	AMSTERDAM
ISSN:	2211-3282
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language POWER-DENSITY; HIGH-ENERGY; ASYMMETRIC SUPERCAPACITORS; IMPEDANCE SPECTROSCOPY; FACILE SYNTHESIS; NICKEL FOAM; NI FOAM; PERFORMANCE; CAPACITANCE; CARBON Multiple languages Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/57741