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Preparation and characterization of turbostratic Ni/Al layered double hydroxides for nickel hydroxide electrode applications

Content Provider	Royal Society of Chemistry (RSC)
Author	Figlarz, Michel Delahaye-Vidal, Agnès Ehlsissen, Kamar Tekaia Genin, Philippe Willmann, Patrick
Copyright Year	1993
Abstract	Replacement of nickel by aluminium in the brucite-type Ni(OH)2 layers leads to layered double hydroxides (LDH), which can be used as active materials for nickel hydroxide electrodes. Ni/Al LDH compounds [0 < Al/(Ni + Al)⩽ 0.25] were synthesized by precipitation with ammonia from mixed Ni/Al nitrate solutions and characterized by X-ray powder diffraction, infrared spectroscopy, chemical analysis and transmission electron microscopy. X-Ray powder diffractograms of fresh precipitates are characteristic of turbostratic layered double hydroxides. A structural model describing the turbostratic layered double hydroxides is proposed on the basis of the experimental results. The brucite-type layers are non-stoichiometric and present hydroxide vacancies: their chemical composition can be written as [Ni1–x2+ Alx3+(OH–)2–(y+2z–x)] and the interlamellar layers as [(NO3–)y(CO32–)z·nH2O] with x⩽ 0.25. The interlamellar anions (NO3– or CO32–) play two roles: those in D3h symmetry, compensate for the positive-charge excess of Al3+ ions, while those in C2v, symmetry, compensate for that of hydroxide vacancies. When aged, mixed turbostratic Ni/Al hydroxides with the higher aluminium content (x 0, 18) change into synthetic takovites (crystallized Ni–Al–CO3 double hydroxides) through a dissolution–recrystallization process.
Starting Page	883
Ending Page	888
Page Count	6
File Format	PDF
ISSN	09599428
Volume Number	3
Issue Number	8
Journal	Journal of Materials Chemistry
DOI	10.1039/JM9930300883
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Nickel Aluminium Layered double hydroxides Lactate dehydrogenase Nickel(II) hydroxide Ammonia Nitrate Powder diffraction Infrared spectroscopy Transmission electron microscopy Non-stoichiometric compound Hydroxide
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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