# US 2021/0276883 A1 · Hierarchical porous honeycombed nickel oxide microsphere and preparation method thereof

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- Number: US 2021/0276883 A1
- Document ID: US20210276883A1
- Status: Published application
- Kind: A1
- Application number: 17/148,783
- Filed: 2021-01-14
- Published: 2021-09-09
- Earliest claimed: 2020-03-05
- Assignees: Northwestern Polytechnical University
- Applicants: Northwestern Polytechnical University
- Inventors: Wangchang GENG; Shilu XU; Yi YAN; Qiuyu ZHANG
- Web page: https://patentgrep.com/patent/US20210276883A1

## CPC

- C01G 53/04: Oxides
- C01P 2002/72: by d-values or two theta-values, e.g. as X-ray diagram
- C01P 2004/03: obtained by SEM
- C01P 2004/32: Spheres
- C01P 2004/34: hollow
- C01P 2004/61: Micrometer sized, i.e. from 1-100 micrometer
- C01P 2006/12: Surface area
- C01P 2006/16: Pore diameter
- C01P 2006/17: Pore diameter distribution
- C01G: COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts or peroxyacids C01B15/00; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium, or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds containing nitrogen, other non-metals and metal C01B21/082}; metal amides C01B21/092; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanamide C01C3/16; thiocyanates C01C3/20)
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

## Abstract

A hierarchical porous honeycombed nickel oxide microsphere and a preparation method thereof are disclosed. The method includes mixing nickel sulfate hexahydrate, urea, water and glycerol, to obtain a mixed solution; subjecting the mixed solution to a hydrothermal reaction, to obtain a precursor; and calcining the precursor, to obtain the hierarchical porous honeycombed nickel oxide microspheres.

## Claims

### Claim 1

A method for preparing a hierarchical porous honeycombed nickel oxide microsphere, comprising,
mixing nickel sulfate hexahydrate, urea, water and glycerol, to obtain a mixed solution, wherein a mass ratio of nickel sulfate hexahydrate to urea is in the range of (0.14-0.28):(0.06-0.60), a volume ratio of glycerol to water is in the range of (0-18):(36-18), and a ratio of the total solid mass of nickel sulfate hexahydrate and urea to the total liquid volume of glycerol and water is in the range of 1 g:(40-110) mL;
subjecting the mixed solution to a hydrothermal reaction, to obtain a precursor, where the hydrothermal reaction is performed at a temperature of 135-140° C. for 40-80 minutes; and
calcining the precursor, to obtain the hierarchical porous honeycombed nickel oxide microspheres.

### Claim 2

(canceled)

### Claim 3

(canceled)

### Claim 4 (depends on 1)

The method as claimed in claim 1, wherein the volume ratio of glycerol to water is 1:35, 1:5, 1:2 or 1:1.

### Claim 5

(canceled)

### Claim 6

(canceled)

### Claim 7 (depends on 1)

The method as claimed in claim 1, wherein the calcining of the precursor is performed at a temperature of 400-450° C. for 20-24 hours.

### Claim 8 (depends on 1)

The method as claimed in claim 1, further comprising subjecting a product obtained after the hydrothermal reaction to a filtering, a washing and a drying in sequence.

### Claim 9 (depends on 1)

The method as claimed in claim 1, wherein the mixing of nickel sulfate hexahydrate, urea, water and glycerol is performed at a temperature of 15-35° C.

### Claim 10

(canceled)

### Claim 11

(canceled)