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Cobalt(II) hydroxide is an inorganic compound with the chemical formula Co (OH) 2, CAS 21041-93-0, and is a light blue or rose colored powder. Insoluble in water, slightly amphoteric, difficult to dissolve in strong bases, but soluble in acid and ammonium salt solutions. Mainly used as a coloring agent for glass and enamel, a raw material for producing other cobalt compounds, and a desiccant for varnish and coatings. It has a wide range of applications in the field of electrocatalysis. For example, it can be used as a cathode hydrogen evolution electrocatalyst for producing high-purity hydrogen gas by electrolyzing water. Researchers have successfully designed and prepared a it core-shell composite nano sheet array supported on porous foam nickel substrate as the cathode hydrogen evolution electrocatalyst of the water electrolysis device, and studied its electrochemical hydrogen evolution performance in alkaline system. This indicates that has good electrochemical activity and stability.
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Chemical Formula |
CoH2O2 |
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Exact Mass |
93 |
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Molecular Weight |
93 |
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m/z |
93 (100.0%) |
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Elemental Analysis |
Co, 63.41; H, 2.17; O, 34.43 |
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Cobalt(II) hydroxide (Co(OH)2) is an inorganic compound with multiple important applications. Mainly used as raw materials for production, as desiccants for coatings and varnishes, as saturated liquids for batteries, and as coloring agents for glass enamel industry. In the field of electrocatalysis, it is also used as a catalyst.
Applications in the Chemical Industry
(1) Colorants for glass and enamel
Due to its bright color and resistance to fading, it is often used as a coloring agent for glass and enamel. In the glass manufacturing process, adding an appropriate amount of this substance can give the glass a specific color, increase the aesthetics and added value of the product. Similarly, in enamel manufacturing, it is also used as a coloring agent to give enamel products a richer color.
(2) Raw materials for producing other cobalt compounds
It is an important raw material for producing other cobalt compounds. Through chemical reactions, it can be converted into other cobalt salts or cobalt oxides, such as cobalt chloride, cobalt sulfate, cobalt oxide, etc. These cobalt compounds have a wide range of applications in the chemical industry, such as catalysts, magnetic materials, battery materials, etc.
(3) Desiccants for paints and varnishes
In the paint and varnish industry, it is commonly used as a desiccant. It can accelerate the drying process of coatings and varnishes, improving the production efficiency and quality of products. The drying effect is achieved through its hygroscopicity and chemical activity, which can absorb moisture and volatile organic compounds in coatings and varnishes, promoting the curing and drying of coatings.
Application in the field of new energy
(1) Battery materials
It has a wide range of applications in the field of batteries. It is one of the important raw materials for secondary batteries such as lithium-ion batteries and nickel hydrogen batteries. In lithium-ion batteries, it can be used as a raw material for positive electrode materials, reacting with lithium ions to achieve the charging and discharging process of the battery. In nickel hydrogen batteries, as an additive for negative electrode materials, it can improve the cycling stability and capacity of the battery.
With the rapid development of new energy vehicles and energy storage technology, the demand for high-performance batteries is constantly increasing. As an important component of battery materials, its market demand is also continuously growing.
(2) Catalysts in the field of electrocatalysis
It has a wide range of applications in the field of electrocatalysis, such as serving as a cathode hydrogen evolution electrocatalyst for the production of high-purity hydrogen gas from water electrolysis. Researchers have successfully designed and prepared a cobalt hydroxide polyaniline core-shell composite nano sheet array supported on porous foam nickel substrate as the cathode hydrogen evolution electrocatalyst of the water electrolysis device, and studied its electrochemical hydrogen evolution performance in alkaline system. This indicates that it has good electrochemical activity and stability, and can be used as an efficient electrocatalyst.
Applications in other fields
(1) Ceramic manufacturing
It is also applied in ceramic manufacturing. It can serve as a coloring agent and additive for ceramics, endowing ceramic products with specific colors and properties. By adding this substance, ceramic products can have richer colors and higher hardness, improving product quality and added value.
(2) Dyes and pigments
It can also be used to manufacture certain blue or purple pigments and dyes. These pigments and dyes have a wide range of applications in the fields of textiles, printing, coatings, etc., and can give products specific colors and patterns.
(3) Catalyst
In addition to its application in the field of electrocatalysis, it can also serve as a catalyst for other chemical reactions. For example, it can serve as a catalyst for the decomposition of hydrogen peroxide, accelerating the process and producing oxygen and water. This catalyst has potential application value in fields such as environmental protection and water treatment.
(4) Magnetic materials
It has a certain degree of magnetism, so it can be used as one of the raw materials for magnetic materials. By compounding or doping with other magnetic materials, composite materials with specific magnetic properties can be prepared for use in fields such as magnetic recording and magnetic sensing.
(5) Other uses
It can also be used to prepare other cobalt compounds, such as cobalt oxides, sulfides, etc. These compounds have a wide range of applications in fields such as electronics, optics, and sensors. In addition, it can also be used to prepare certain special chemicals and drugs, such as anti-cancer drugs.
Synthesis method of Cobalt(II) hydroxide:
Cobalt containing waste method various cobalt containing waste materials are dissolved by nitric acid and hydrochloric acid. The obtained product is purified with hydrogen peroxide to remove iron. If necessary, sodium carbonate or ammonia water is added to ensure complete purification. The purified it is added with sodium hydroxide to produce, which is then washed and centrifuged to products.
It is obtained by electrolysis of salt solution with cobalt as anode.
Dissolve 100g CoSO4 · 7H2O in water to form a nearly saturated solution. Add 42g sodium hydroxide in 60ml water to form an alkali solution under the condition of heating and continuous stirring. The precipitation reaction is carried out in a long beaker, which is conducive to the clarification of the mixture. The precipitate formed at the beginning is blue. When it is heated on a water bath, the precipitate quickly turns red. After clarification, decant and wash with water for several times, then filter on the Buchner funnel and wash with water until the washing water is neutral. Finally, it is dried in a vacuum dryer equipped with concentrated H2SO4. Since cobalt hydroxide will be slowly oxidized in air, the preparation operation is best carried out in an operation box protected by inert gas.
When the reaction basically stops, supplement the lost water, separate the excess metal, add CoCO3 to make the solution close to neutral, and keep it at this temperature for 2~3h, filter and remove the insoluble matter. Then slowly add 2% ammonia under the condition of continuous stirring and heating, so that the blue precipitate that begins to form can be transformed into purple in time, and then into light rose red precipitate. After the reaction is completed and clarified, suck out the solution with a straw, wash it with water until the aqueous solution is neutral, quickly filter out the sediment, and dry it in a vacuum dryer equipped with concentrated H2SO4.
Two crystalline phases of cobalt hydroxide:
1.
A-Co (OH) 2 has a structure similar to that of hydrotalcite, and its typical feature is the structure of layered dihydroxy composite metal oxide. Due to its large layered structure, its conductivity is good. This type of product is usually blue-green in color. However, this phase is unstable and in metastable state, which is easy to change into β Phase.
2.
β- CO (OH) 2 has brucite structure, the hydroxyl ions are hexagonal closely packed, and the cations fill all the octahedral spaces between each two adjacent hydroxyl ions; The structural layer that forms the coordination octahedron. There are ionic bonds in the structural layers, and the structural layers are maintained by phases. Its color is often brick red, or rose red.
Cobalt is an important element in biology. A small dose can activate many enzymes that regulate tissue respiration, hematopoiesis and other processes. At a large dose, it inhibits the activity of these enzymes, affects carbohydrate metabolism, selectively damages the endocrine part of the pancreas, affects the cardiovascular system, dilates blood vessels, reduces blood pressure, and selectively damages the myocardium. Inhalation of cobalt compounds sometimes leads to bronchial asthma. Ground cobalt compounds can cause acute dermatitis and sometimes form ulcers on the surface. The maximum allowable concentration of cobalt metal and Cobalt(II) hydroxide is 0.5 mg / m ³. Gas masks, dust-proof work clothes and protective gloves should be used during work to protect respiratory organs and skin. When exposed to metal cobalt dust at work, it is recommended to wash hands with a paste. Pay attention to dust prevention and dust removal in production, and adopt wet operation.
Everything You Need to Know
1. What is Cobalt(II) Hydroxide, and how is it prepared?
Answer: Cobalt(II) hydroxide is an inorganic compound with the formula Co(OH)₂. It is a pink to blue-green solid that is sparingly soluble in water. It is commonly prepared by reacting cobalt(II) salts (e.g., cobalt chloride, CoCl₂) with a strong base like sodium hydroxide (NaOH) in an aqueous solution:
CoCl2+2NaOH→Co(OH)2↓+2NaCl
2. What are the key properties of Cobalt(II) Hydroxide?
Answer:
Appearance: Pink to bluish-green powder.
Solubility: Insoluble in water but dissolves in acids and ammonia solutions.
Stability: Decomposes upon heating to form cobalt(II) oxide (CoO) and water.
Magnetic Behavior: Exhibits antiferromagnetic properties at low temperatures.
Reactivity: Acts as a weak base and can undergo redox reactions under specific conditions.
3. What are the main applications of Cobalt(II) Hydroxide?
Answer:
Battery Industry: Used as a precursor for synthesizing cobalt-based cathode materials in lithium-ion batteries (e.g., LiCoO₂).
Catalysts: Serves as a catalyst or catalyst precursor in organic synthesis and hydrogenation reactions.
Pigments: Employed in the production of cobalt-based pigments for ceramics and glass.
Electroplating: Acts as an additive in electroplating solutions to improve coating properties.
Chemical Synthesis: Used to prepare other cobalt compounds like cobalt oxides or cobalt salts.
4. Is Cobalt(II) Hydroxide hazardous, and what safety precautions are needed?
Answer: Yes, cobalt(II) hydroxide is considered hazardous due to its cobalt content, which can be toxic if inhaled, ingested, or absorbed through the skin. Chronic exposure may lead to health issues such as respiratory irritation, dermatitis, or organ damage.
Safety Precautions:
Wear protective gloves, goggles, and a mask when handling.
Work in a well-ventilated area to avoid inhalation of dust.
Store in a cool, dry place away from incompatible substances (e.g., strong acids).
Dispose of waste according to local regulations for heavy metal compounds.
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