Electrochemical characteristics of nickel hydroxide modified by electroless cobalt coating

1998 ◽  
Vol 23 (10) ◽  
pp. 873-878 ◽  
Author(s):  
X WANG
Keyword(s):  
Nickel Hydroxide ◽  
Electrochemical Characteristics ◽  
Cobalt Coating

Nickel Oxide Coated on Pretreated MWCNTs as an Electrode for Supercapacitor

2013 ◽  
Vol 829 ◽  
pp. 654-658
Author(s):  
Lida Mahmoudi ◽  
Farzad Mahboubi ◽  
Moreteza Saghafi Yazdi
Keyword(s):  
Nickel Oxide ◽  
Thermal Annealing ◽  
Nickel Hydroxide ◽  
Annealing Temperature ◽  
Electrochemical Characteristics ◽  
Sem Images ◽  
Electroactive Materials ◽  
Nanotubular Structure ◽  
Individual Cnts ◽  
The Individual

Nickel oxide/carbon nanotubes (NiO/CNTs) composite materials for supercapacitor are prepared by chemically depositing of nickel hydroxide onto CNTs pretreated by ultrasonication and followed by thermal annealing at 200-300°C. A series of NiO/CNTs composites with different weight ratios of CNTs and different annealing temperature are synthesized via the same route. The scanning electron microscope (SEM) images show that the nucleation of the nickel hydroxide formed on the outer walls of CNTs due to ultrasonic cavitations, and then nickel oxide coated uniformly on the outer surface of the individual CNTs after thermal annealing. The NiO/CNTs electrode presents a maximum specific capacitance of 254 F/g as well as a good cycle life in 2 M KOH electrolyte. The good electrochemical characteristics of NiO/CNTs composite can be attributed to the three-dimensionally interconnected nanotubular structure with a thin film of electroactive materials.

scholarly journals INFLUENCE OF THE PYROKATEKHIN COMPLEX FORMING AGENT ON THE EXTRACTION OF NICKEL AND NICKEL HYDROXIDE FROM GALVANO SLIDES AND THE STUDY OF CHARACTERISTICS OF ELECTRODES MADE FROM Ni(OH)2

2021 ◽  
Vol 23 (5) ◽  
pp. 90-95
Author(s):  
L.N. Olshanskaya ◽  
◽  
E.N. Lazareva ◽  
E.V. Yakovleva ◽  
◽  
...  
Keyword(s):  
Nickel Hydroxide ◽  
Negative Impact ◽  
Mutagenic Effect ◽  
Selective Extraction ◽  
Machine Building ◽  
Electrochemical Characteristics ◽  
Active Mass ◽  
Nickel Ions ◽  
Galvanic Sludge ◽  
Nickel Cadmium

The problems of enterprises of the chemical and machine-building industries, which have a negative impact on the state of the natural environment, are considered. The galvanic workshops and areas available in their structure belong to categories 1-3 of hazard classes due to the use of solutions and the resulting wastewater containing various heavy metals.On the territory of these workshops, a large amount of galvanic sludge (GS) is formed and accumulates, containing such toxic components as nickel, zinc, iron, copper, chromium, lead, cadmium, etc., which have a high toxic, carcinogenic and mutagenic effect on living organisms. However, when finding an effective method for processing, GS can serve as a source of obtaining valuable components, in particular metals and their compounds. The work carried out selective extraction of nickel ions contained in galvanic sludge into a solution with addition of pyrocatekhin (PC) in the concentration range of 50-250 g/l (step 50 g/l). It was found that the optimal concentration of catechol for the extraction of Ni2+ ions was Cpc = 50 g/l. With an increase in the concentration of PC, the concentration of extracted nickel ions increases (from 12.4 to 18.2 mg / ml), however, at high concentrations of PC (100–250 g / L), a thick suspension is formed, which is practically not amenable to filtration. During the subsequent processing of the resulting solution of 40% NaOH in the range of pH = 7.2 ÷ 9.5, Ni(OH)2 hydroxide was precipitated, which met the requirements of TU 48 3 63 90 "Nickel nitrous hydrate". It was used as a component of the active mass of nickel-cadmium (iron) battery cathodes. The electrochemical characteristics of the obtained cathodes have been studied and it has been shown that, in terms of their operating parameters, they are not inferior to industrial Ni(OH)2 electrodes. As a result of the experiments, it was found that the proposed technology for extracting nickel hydroxide from metal-containing galvanic sludge can be used to manufacture the active mass of nickel-cadmium (iron) batteries cathodes and is promising.

Extraction of Nickel Hydroxide from Galvanic Waste Production for the Manufacture of the Nickel-Cadmium (Iron) Battery

2018 ◽  
Vol 22 (6) ◽  
pp. 4-9 ◽  
Author(s):  
L.N. Olshanskaya ◽  
E.A. Danilova ◽  
Е.N. Lazareva
Keyword(s):  
Nickel Hydroxide ◽  
Active Component ◽  
Electrochemical Characteristics ◽  
Calculation Methods ◽  
Hazard Class ◽  
Waste Production ◽  
Galvanic Sludge ◽  
Ecological Parameters ◽  
Charge Discharge ◽  
Nickel Cadmium

Process of extraction of nickel hydroxide from the nickel containing sludge of "Robert Bosch Saratov" Ltd have been studied. It was established that it can be used as an active component of cathode mass for manufacture of Ni(OH)2electrode of a nickel-cadmium (iron) battery. Conducted tests of the Ni(OH)2 based electrodes showed high electrochemical characteristics at work under conditions of production mode, good stability and duration of discharge: capacity 0,93–1.0 A・h, coefficient of use 83–86 % during 110 charge-discharge cycles. Technological scheme of Ni(OH)2 production is presented. The prevented ecological damage to soils resources of Saratov region is calculated. It is 95.000 rub/h. Evaluation of descending of hazard class of the galvanic sludge for environmental on ecological parameters of safety is conducted. By biotesting (on Chlorella vulgaris Beijer) and calculation methods it was shown that extraction of nickel allows to reduce of hazard class of the galvanic sludge from 2–3 to 4.

Preparation and Study of Spherical Nickel Hydroxide Coated by Cobalt Oxy-Hydroxide

2013 ◽  
Vol 668 ◽  
pp. 383-387 ◽  
Author(s):  
Xin Gang Hou ◽  
Wen Wu Liu ◽  
Cai Xia Li ◽  
You Fu Wang
Keyword(s):  
Nickel Hydroxide ◽  
Active Material ◽  
Specific Capacity ◽  
Chemical Precipitation ◽  
Constant Current ◽  
Precipitation Method ◽  
Electrochemical Characteristics ◽  
X Ray Diffraction ◽  
Constant Current Charge ◽  
Discharge Test

Nanometer nickel hydroxide particles coated by cobalt oxy-hydroxide are prepared through chemical precipitation method. The properties of coated Ni(OH)2 particles is characterized by using X-ray diffraction, scanning electron microscopy, constant current charge/discharge test and cyclic voltammetry. Studies are focused on the effects of different amounts of cobalt oxy-hydroxide on structure and electrochemical characteristics of nickel hydroxide. The results show that a structure of β-Ni(OH)2 is preserved and 2.5 wt % CoOOH can form a well distributed conductive network on the surface of nickel hydroxide particles, thereby leading to higher utilization of active material; Compared to other electrodes, the electrodes with 2.5 wt % coated CoOOH show higher specific capacity and better cycling durability, and the electrodes also has better reversibility of the Ni(OH)2/NiOOH redox couple, and higher oxygen evolution potential.

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