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Take you to understand red copper oxide

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Author : TRUNNANO
Update time : 2021-03-26 16:53:42
Summary of cuprous oxide Cu2O powder
It is a bright red powdery solid and hardly decomposes water. It disproportionates to divalent copper and copper elements in acid solution, and gradually oxidizes to black in the nearby air. Copper oxideCu2O is mainly used to make antifouling paint on the bottom of ships (used to kill low-level marine animals), insecticides, various copper salts, analytical reagents, red glass, and the preparation of copper coatings and copper alloy coating solutions.
If used and stored in accordance with the specifications, the cuprous oxide will not decompose, and there is no known dangerous reaction, please avoid oxidation, vertical and air. Cuprous oxide will not generate copper salts in dilute sulfuric acid but will replace nitric acid. It will turn blue soon. Although cuprous oxide is stable in dry air, it will slowly oxidize near the air to form copper oxide, so oxygen scavengers can be used. In addition, it can be easily reduced to metallic copper with a reducing agent. Cuprous oxide is insoluble in water and is dissolved by forming a complex with aqueous ammonia solution and concentrated hydrohalic acid.

What color is cuprous oxide?
Cuprous oxide, a red crystalline material, can be produced by electrolysis or furnace methods. Hydrogen, carbon monoxide, charcoal or iron can easily reduce it to metallic copper. It imparts a red color to the glass and is used as an antifouling paint.
Why is the color of cuprous oxide red?
Red copper is a reduced form of ordinary black copper oxide (CuO). During normal oxidative firing, it will be converted to the form of copper oxide (CuO), which produces a normal green color in the glaze and glass. If it undergoes reduction firing, it will maintain its Cu2O structure to produce a typical copper-red color.

What is the role of cuprous oxide?
1. Suitable for pesticides.
2. Suitable for antibacterial fibers and clothing.
3. Cuprous oxide is also suitable for agricultural fungicides.
4. As a preservative, it is suitable for ship primers to prevent pollution and microorganisms.
5. Used in the manufacture of various copper salts and analytical reagents.
6. Used as a catalyst for organic synthesis.
7. Cuprous oxide is used as a pigment in ceramics to produce blue, red and green, and sometimes it can produce gray, pink or black glaze.
8. It has also been mistakenly used as a dietary supplement in animal feed. Due to the low biological activity, the absorbable copper is negligible.
9. It is also used when welding with copper alloys.

Is cuprous oxide dangerous?
Toxic if swallowed. If the skin is absorbed by the skin, it may be harmful. May cause skin irritation. The eyes may irritate the eyes.
What is the difference between CuO and Cu2O?
Cu2O is obtained by oxidizing copper metal or reducing copper (II) solution with sulfur oxide, while CuO is obtained by pyrometallurgical methods used to extract copper from ore. Many wood preservatives are made of copper. It is also used as a pigment to make different glazes.

How is a cuprous oxide formed?
Generally, the order of forming an oxide phase from copper by thermal oxidation is Cu→Cu+Cu2O→Cu2O→Cu2O+CuO→CuO. In addition, the formation of pure Cu2O occurs at around 200°C, while the formation of CuO starts at 300°C to 1000°C.
How to store cuprous oxide
Cuprous oxide Cu2O powder should be stored in a dry, cool and sealed environment, and should not be exposed to the air. In addition, heavy pressure should be avoided and transported as ordinary items.

Reduction of photoelectrochemical nitrogen to ammonia on copper oxide and cuprous oxide photocathodes
By reducing N2 by photoelectrochemical method, water can be used as a hydrogen source to produce NH3 under ambient conditions. In addition, by using solar energy, photoelectrochemical N 2 reduction can significantly reduce the energy required for N 2 reduction. In this study, the photoelectrochemical method for the reduction of N2 was studied using CuO and Cu2O photocathodes, which are known to be poor in water reduction reactions, and the main reaction is to compete with N2 reduction. When tested with isotope-labeled 15N2 in a 0.1 M KOH solution under simulated sunlight, the CuO and Cu2O photocathodes produced 15NH3 with Faraday efficiencies of 17% and 20% at 0.6 and 0.4 V under the reversible hydrogen electrode, respectively. . These potentials are significantly more positive than the thermodynamic reduction potential of N2, which shows how the use of photo-excited electrons in CuO and Cu2O photocathodes can reduce the energy required for NH3 production. Carefully examined the use of light-excited electrons in these photocathodes to reduce N2, reduce moisture and corrosive light.

Scientists use ultrafine cuprous oxide less than 3 nanometers to achieve visible light nitrogen fixation
The latest research by Zhang Tierui’s team from the Institute of Physics and Chemistry of the Chinese Academy of Sciences has prepared ultrafine cuprous oxide (Cu2O) smaller than 3 nanometers, which has achieved visible-light-driven nitrogen fixation. Related papers were recently published in the "Germany Applied Chemistry" magazine.
In this study, the team used ascorbic acid to perform an in-situ topological reduction reaction on a layered double hydroxide containing divalent copper and successfully prepared ultrafine cuprous oxide pellets with uniform dimensions and lateral dimensions less than 3 nanometers. The ultrafine cuprous oxide supported by the substrate efficiently and stably realizes the visible-light-driven N2→NH3 photocatalytic reduction reaction (under 400nm wavelength photocatalysis, the reaction rate normalized according to the quality of the cuprous oxide is as high as 4.10 mmol ·GCu2O-1·h-1). Such high activity may be attributed to the long lifetime of photogenerated electrons trapped by the trap, sufficient activation sites to be exposed, and the characteristics of the substrate material. This work guides the future design of ultrafine catalysts for ammonia synthesis or other applications.

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