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CN-122010191-A - Nano nickel oxide and preparation method thereof

CN122010191ACN 122010191 ACN122010191 ACN 122010191ACN-122010191-A

Abstract

The application provides nano nickel oxide and a preparation method thereof. Wherein, the ratio of trivalent nickel to divalent nickel on the surface of the nano nickel oxide is 1.5-4.0. The activity of the nano nickel oxide in Oxygen Evolution Reaction (OER) can be improved by controlling the ratio of the trivalent nickel to the divalent nickel on the surface of the nano nickel oxide to be 1.5-4.0. Therefore, the nano nickel oxide can become a potential substitute material, can replace the traditional noble metal electrode, and is applied to the water electrolysis hydrogen production reaction. The nano nickel oxide is used as an electrode material, so that the cost of hydrogen production by water electrolysis is effectively reduced, and new possibility is provided for realizing more economic and sustainable hydrogen production.

Inventors

  • LI GANG
  • YANG YONG
  • FAN WEIZHEN
  • SHI LITAO

Assignees

  • 广州天赐高新材料股份有限公司

Dates

Publication Date
20260512
Application Date
20241108

Claims (11)

  1. 1. The nano nickel oxide is characterized in that the ratio of trivalent nickel to divalent nickel on the surface of the nano nickel oxide is 1.5-4.0.
  2. 2. A method of preparing the nano nickel oxide of claim 1, comprising: obtaining nano nickel oxide to be treated, measuring the proportion of trivalent nickel to divalent nickel on the surface of the nano nickel oxide to be treated, and marking the proportion as a measured value I0; And obtaining a comparison result of the measured value I0 and the target value I, and controlling the proportion of trivalent nickel and divalent nickel on the surface of the nano nickel oxide to be treated within the range of the target value I by oxidation treatment or reduction treatment according to the comparison result, wherein the target value I is 1.5-4.0.
  3. 3. The method according to claim 2, characterized in that: when the measured value I0 is smaller than the minimum value of the target value I, carrying out oxidation treatment on the nano nickel oxide to be treated; And when the measured value I0 is larger than the maximum value of the target value I, carrying out reduction treatment on the nano nickel oxide to be treated.
  4. 4. A method according to claim 3, wherein the oxidation treatment comprises: And (3) carrying out oxidation calcination treatment on the nano nickel oxide to be treated under the condition of the first oxygen content, wherein the first oxygen content is preferably 0.1% -20%.
  5. 5. The method of claim 4, wherein the oxidative calcination treatment comprises: And heating the nano nickel oxide to be treated in sequence to perform first oxidation calcination and second oxidation calcination, wherein the temperature of the first oxidation calcination is 120-140 ℃ and the time is 20-40 min, and the temperature of the second oxidation calcination is 200-400 ℃ and the time is 0.5-5 h.
  6. 6. A method according to claim 3, wherein the reduction process comprises: And (3) carrying out reduction calcination treatment on the mixture of the nano nickel oxide to be treated and the carbonaceous substance under the condition of a second oxygen content, wherein the second oxygen content is preferably 0.1% -20%.
  7. 7. The method of claim 6, wherein the reduction calcination treatment comprises: And heating the mixture in sequence to perform first reduction calcination and second reduction calcination, wherein the temperature of the first reduction calcination is 120-140 ℃ and the time is 20-40 min, and the temperature of the second reduction calcination is 250-450 ℃ and the time is 0.5-5 h.
  8. 8. The method according to claim 7, wherein the mass ratio of the nano nickel oxide to be treated and the carbonaceous material is 1 (1-3); and/or the carbonaceous material comprises at least one of carbon black and graphite.
  9. 9. The method according to any one of claims 1 to 8, wherein the oxidation treatment or the reduction treatment is performed in a tube furnace.
  10. 10. The method according to claim 9, further comprising, before the oxidation treatment or the reduction treatment, performing a vacuum-pumping treatment in a tube furnace, wherein a gas pressure in the tube furnace is 10 -3 Pa to 10 -5 Pa.
  11. 11. Use of the nano nickel oxide of claim 1 or prepared by the method of any one of claims 2-10 as an anode electrode for hydrogen production by electrolysis of water.

Description

Nano nickel oxide and preparation method thereof Technical Field The application relates to the field of electrochemistry and new energy materials, in particular to nano nickel oxide and a preparation method thereof. Background The nano nickel oxide is a typical semiconductor, has good heat sensitivity, gas sensitivity and other characteristics, and is a promising functional material. Along with the superfine modification of the nano nickel oxide, the surface structure and the crystal structure are uniquely changed, so that the surface effect, the small-size effect, the quantum size effect and the macroscopic quantum tunneling effect are generated, and the nano nickel oxide has excellent catalytic performance, electrochemical performance and the like. Based on this series of excellent properties, nano nickel oxide is also commonly used as a catalyst, a sensor, and a battery electrode material. Since the electron arrangement of nickel is 1s 22s22p63s23p63d84s2, which means that the nickel has an unfilled 3d shell layer and a partially filled 4s shell layer, nickel can lose different numbers of electrons in chemical reaction to form different oxidation states, and the change of the atomic metering ratio is various to lead the nickel to have rich physicochemical properties, the nano nickel oxide applied to the functional material generally has trivalent nickel (Ni 3+) and divalent nickel (Ni 2+) at the same time, so that the nickel becomes an anode oxygen evolution electrocatalytic material with commercial application potential under alkaline conditions. However, in practical applications, there are still many obstacles to the use of nano nickel oxide for anodic oxygen evolution. Disclosure of Invention The present application aims to solve at least one of the technical problems existing in the prior art to at least some extent. In a first aspect of the application, the application provides a nano nickel oxide. According to the embodiment of the application, the ratio of trivalent nickel to divalent nickel on the surface of the nano nickel oxide is 1.5-4.0. The activity of the nano nickel oxide in Oxygen Evolution Reaction (OER) can be improved by controlling the ratio of the trivalent nickel to the divalent nickel on the surface of the nano nickel oxide to be 1.5-4.0. Therefore, the nano nickel oxide can become a potential substitute material, can replace the traditional noble metal electrode, and is applied to the water electrolysis hydrogen production reaction. The nano nickel oxide is used as an electrode material, so that the cost of hydrogen production by water electrolysis is effectively reduced, and hydrogen can be produced more economically and continuously. In a second aspect of the application, the application provides a method for preparing the nano nickel oxide according to the first aspect. According to the embodiment of the application, the method comprises the steps of obtaining nano nickel oxide to be treated, measuring the ratio of trivalent nickel to divalent nickel on the surface of the nano nickel oxide to be treated, recording the ratio as a measured value I0, obtaining a comparison result of the measured value I0 and a target value I, and controlling the ratio of the trivalent nickel on the surface of the nano nickel oxide to be treated to the divalent nickel within the range of the target value I through oxidation treatment or reduction treatment according to the comparison result, so as to obtain the nano nickel oxide, wherein the target value I is 1.5-4.0. Thus, the method of the present application has several advantages. Firstly, the method is simple to operate, has few steps, is convenient for realizing industrial production, and is suitable for large-scale application. And secondly, the method does not introduce extra impurities, ensures the purity and performance of the product, and reduces the production cost. Furthermore, the process is less energy consuming than other methods, contributing to improved economics. In addition, the proportion of nickel ions can be precisely controlled by adjusting the treatment conditions, so that the performance of the nano nickel oxide is optimized. According to an embodiment of the present application, the method for controlling the nickel valence state of the nano nickel oxide surface may further include at least one of the following additional technical features: According to the embodiment of the application, when the measured value I0 is smaller than the minimum value of the target value I, the nano nickel oxide to be treated is subjected to oxidation treatment, and when the measured value I0 is larger than the maximum value of the target value I, the nano nickel oxide to be treated is subjected to reduction treatment. Therefore, the proportion of trivalent nickel to divalent nickel on the surface of the nano nickel oxide to be treated can be accurately regulated and controlled to be within the range of 1.5-4.0. According to the embodiment