Microelectrode Studies of Electrochemically Coprecipitated Cobalt Hydroxide in Nickel Hydroxide Electrodes

1978 ◽  
Vol 125 (7) ◽  
pp. 1026-1032 ◽  
Author(s):  
David F. Pickett ◽  
J. T. Maloy
Keyword(s):  
Nickel Hydroxide ◽  
Cobalt Hydroxide

scholarly journals Microparticles with hetero-nanointerfaces: controlled assembly of cobalt hydroxide and nickel hydroxide nanoclusters towards improved electrochemical functions

2019 ◽  
Vol 7 (44) ◽  
pp. 25290-25296 ◽  
Author(s):  
Naoki Tarutani ◽  
Yasuaki Tokudome ◽  
Matías Jobbágy ◽  
Galo J. A. A. Soler-Illia ◽  
Masahide Takahashi
Keyword(s):  
Nickel Hydroxide ◽  
Metal Hydroxide ◽  
Cobalt Hydroxide ◽  
Controlled Assembly

Hybridization of electrochemical functions derived from large hetero-interfaces by assembly of layered metal hydroxide nanoclusters.

scholarly journals Effect of Substituents on the Electrochemical Reversible Discharge Capacity of Cobalt Hydroxide Electrodes

2015 ◽  
Vol 18 (2) ◽  
pp. 091-093 ◽  
Author(s):  
Thimmasandra Narayan Ramesh
Keyword(s):  
Zinc Oxide ◽  
Metal Ions ◽  
Discharge Capacity ◽  
Electrode Material ◽  
Nickel Hydroxide ◽  
Precipitation Method ◽  
Cobalt Hydroxide ◽  
Effect Of Substituents ◽  
Pure Cobalt ◽  
Biphasic Mixture

Cobalt hydroxide, nickel hydroxide-cobalt hydroxide and zinc oxide-cobalt hydroxide biphasic mixtures were prepared by precipitation method. In spite of structural similarities exhibited by nickel hydroxide and cobalt hydroxide samples, former is a good electrode material and exchanges 1e-/Ni while latter does not show any reversibility. Presence of small amount of other metal ions such as nickel or zinc in the lattice of cobalt hydroxide or as a biphasic mixture of cobalt hydroxide-nickel hydroxide/cobalt hydroxide- zinc oxide, exchange up to 0.2 to 0.24e- exchange compared to pure cobalt hydroxide which shows 0.1 e- exchange.

SYNTHESES AND PROPERTIES OF COBALT AND NICKEL HYDROXIDE NANOSHEETS

2010 ◽  
Vol 24 (15n16) ◽  
pp. 2291-2296 ◽  
Author(s):  
MASASHI KURASHINA ◽  
AKIO EGUCHI ◽  
EIJI KANEZAKI ◽  
TAKUYA SHIGA ◽  
HIROKI OSHIO
Keyword(s):  
Nickel Hydroxide ◽  
Hysteresis Loops ◽  
Layered Compounds ◽  
Cobalt Hydroxide ◽  
Colloidal Solutions ◽  
Hexagonal System ◽  
Force Microscopy ◽  
Aspect Ratios ◽  
Dodecylbenzene Sulfonate ◽  
Cobalt And Nickel

Nanosheets of cobalt and nickel hydroxides nanosheets were prepared by delamination of layered compounds, Co II( OH )1.73( DBS )0.27·0.87 H 2 O ( Co - DBS , DBS = dodecylbenzene sulfonate) and Ni II( OH )1.63( DBS )0.37·1.24 H 2 O ( Ni - DBS ), respectively. Powder X-ray diffraction analyses of the layered compounds revealed lattice parameters of a0 = 3.07 Å and c0 = 30 Å ( Co - DBS ) and a0 = 3.09 Å and c0 = 30 Å ( Ni - DBS ) in the hexagonal system. Dispersions of Co - DBS and Ni - DBS in 1-butanol produced colloidal solutions of nanosheets, [ Co - DBS ] delam and [ Ni - DBS ] delam , respectively. Poly(vinylpyrrolidone) ( PVP ) was dissolved in [ Co - DBS ] delam and [ Ni - DBS ] delam and the mixtures were dried to yield Co - PVP and Ni - PVP , respectively. These nanosheets measured 150-500 nm for [ Co - DBS ] delam and 135-400 nm for [ Ni - DBS ] delam by means of dynamic light scattering. Atomic force microscopy images showed lateral dimensions of 100-500 nm for [ Co - DBS ] delam and 50-100 nm for [ Ni - DBS ] delam . In the former image, the cobalt hydroxide nanosheets had a fairly flat terrace structure with thickness of 3.1-3.6 nm and with aspect ratios of 30-150, whereas in the latter image dome-like nanosheets of nickel hydroxide with height of 2.2-2.3 nm were confirmed. These nanosheets were regarded as monolayer. Magnetization experiments at 1.8 K showed hysteresis loops for Co - DBS , Co - PVP , Ni - DBS , and Ni - PVP .

scholarly journals Effect of Crystallinity of β- and βbc-Nickel Hydroxide Samples on Chemical Cycling

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Ramesh Thimmasandra Narayan
Keyword(s):  
Diffraction Data ◽  
Nickel Hydroxide ◽  
Ammonium Hydroxide ◽  
Structural Disorder ◽  
Chemical Oxidation ◽  
Cobalt Hydroxide ◽  
X Ray Diffraction ◽  
X Ray ◽  
Diffraction Patterns ◽  
Nickel Oxyhydroxide

β-phases of nickel hydroxide and cobalt hydroxide samples crystallize in cadmium iodide type structure. β-cobalt hydroxide on oxidation generates β-CoOOH which crystallized in 3R1 polytype while the structure of β-phase of NiOOH polytype is less well understood. β- and βbc-phases of nickel hydroxide samples were prepared by using ammonium hydroxide and sodium hydroxide as precipitating agents. Powder X-ray diffraction data shows that β-phase of nickel hydroxide is perfectly crystalline in nature while βbc-phase of nickel hydroxide is poorly ordered. β- and βbc-phases of nickel hydroxide samples were subjected to chemical oxidation using sodium hypochlorite. The oxidized phases of β- and βbc-phases of nickel oxyhydroxide are highly disordered and the broadening of reflections in the powder X-ray diffraction patterns is due to the presence of structural disorder, variations in the crystallite size, and strain. On reduction of β- and βbc-phases of nickel oxyhydroxide, the powder X-ray diffraction patterns visually match the powder X-ray diffraction data of the pristine phases of β- and βbc-phases of nickel hydroxide indicating that the β-phase of nickel hydroxide does not transform to βbc-phase of nickel hydroxide, but the particle sizes are significantly affected.

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