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Electrochemical performance of cobalt hydroxide nanosheets formed by the delamination of layered cobalt hydroxide in water

SYSNO ASEP	0429046
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Electrochemical performance of cobalt hydroxide nanosheets formed by the delamination of layered cobalt hydroxide in water
Author(s)	Schneiderová, Barbora (UACH-T)_SAI Demel, Jan (UACH-T)_{SAI, RID, ORCID} Pleštil, Josef (UMCH-V)_RID Tarábková, Hana (UFCH-W)_{RID, ORCID} Bohuslav, Jan (UFCH-W) Lang, Kamil (UACH-T)_{SAI, RID, ORCID}
Source Title	Dalton Transactions. - : Royal Society of Chemistry - ISSN 1477-9226 Roč. 43, č. 27 (2014), s. 10484-10491
Number of pages	8 s.
Language	eng - English
Country	GB - United Kingdom
Keywords	Ray-absorption spectroscopy ; Alpha-cobalt ; Solvothermal decomposition ; Nickel ; Nanocomposites
Subject RIV	CA - Inorganic Chemistry
Subject RIV - cooperation	Institute of Macromolecular Chemistry - Macromolecular Chemistry
R&D Projects	GP13-09462P GA ČR - Czech Science Foundation (CSF)
Institutional support	UACH-T - RVO:61388980 ; UFCH-W - RVO:61388955 ; UMCH-V - RVO:61389013
UT WOS	000338117200020
EID SCOPUS	84902665765
DOI	10.1039/C4DT00141A
Annotation	We report the preparation of monometallic Co2+/Co3+ layered double hydroxide, intercalated with lactate anions (LCoH-Lactate), and its spontaneous delamination in water to form cobalt hydroxide nanosheets. These hydroxide nanosheets formed stable aqueous dispersions. The thickness of a nanosheet was estimated to be approximately 1 nm by atomic force microscopy and small angle X-ray scattering experiments, and corresponds to a single hydroxide layer. Some of the Co2+ cations were oxidised by oxygen, resulting in a mixed Co2+0.76Co3+0.24 layer composition. Upon water evaporation, the nanosheets restacked to form transparent self-standing films with a layered structure like that of the original material. The coverage of the surface with side-by-side stacks of nanosheets indicated two-dimensional agglomeration and suggested that these dispersions could be applied to prepare large monolayers of nanosheets. The layers prepared by spin-coating were stable and featured reversible and reproducible redox properties in an alkaline electrolyte. In an evaluation of their electrochemical performance, the cobalt hydroxide nanosheets exhibited durability and fast charge transfer kinetics during repetitive potential cycling up to 200 mV s−1. The nanosheets prepared by the present method show promise for use in nanocomposite materials for energy storage applications.
Workplace	Institute of Inorganic Chemistry
Contact	Jana Kroneislová, krone@iic.cas.cz, Tel.: 311 236 931
Year of Publishing	2015

Number of the records: 1