Porous metal oxide and method of preparing the same

Abstract

Porous metal oxides are provided. The porous metal oxides are prepared by heat treating a coordination polymer. A method of preparing the porous metal oxide is also provided. According to the method, the shape of the particles of the metal oxide can be easily controlled, and the shape and distribution of pores of the porous metal oxide can be adjusted.

Description

CROSS-REFERENCE TO RELATED PATENT APPLICATION

[0001] This application claims priority to and the benefit of Korean Patent Application No. 10-2006-0028395 filed on Mar. 29, 2006 in the Korean Intellectual Property Office, the entire content of which is incorporated herein by reference.BACKGROUND OF THE INVENTION

[0002] 1. Field of the Invention

[0003] The present invention relates to a porous metal oxide and a method of preparing the same, and more particularly, to a porous metal oxide having a particle shape that can be easily-controlled and pores having an adjustable shape and distribution, and a method of preparing the same.

[0004] 2. Description of the Related Art

[0005] Porous metal oxides are used as electrode materials in the energy field. In general, electrode materials must have good electronic conductivity and good ionic conductivity, while ionic conductivity is typically lower than electronic conductivity. However, in porous electrode materials, ions can be delivered to the inside o...

Examples

example 1

[0054]37.33 g of nickel (II) acetate tetrahydrate and 19.96 g of trimesic acid were added to 500 ml of distilled water and stirred at 55° C. for 2 hours. Powders produced in the solution were removed using a nylon filter, washed with distilled water several times, and then dried in an oven at 80° C. for 12 hours to obtain a crystalline coordination polymer. FIG. 1 is a scanning electron microscope (SEM) image of the crystalline coordination polymer prepared according to this example.

[0055]The obtained crystalline coordination polymer was subjected to heat treatment under an Ar atmosphere at 600° C. for 1 hour to prepare a carbon-nickel composite having the same shape as the untreated crystalline coordination polymer and a reduced volume. FIG. 2 is a SEM image of the obtained carbon-metal composite.

[0056]FIGS. 3A and 3B are SEM images of a porous nickel oxide obtained by heat treating the obtained carbon-nickel composite in air at 700° C. for 1 hour. FIGS. 3A and 3B show that the oxi...

examples 2 through 5

[0057]Synthesis of the coordination polymer and heat treatment were performed as in Example 1, except that the heat treatment temperature for forming the carbon-metal composite was adjusted from 700 to 1000° C. as listed in Table 1 below.

TABLE 1Heat treatment temperature (° C.)First heatSecond heatSamplePrecursortreatment (Argon)treatment (Air)Example 2Nickel(II) trimesate700700Example 3Nickel(II) trimesate800700Example 4Nickel(II) trimesate900700Example 5Nickel(II) trimesate1000700

FIGS. 6A and 6B are SEM images of the porous nickel oxide prepared according to Example 2. FIGS. 7A and 7B are SEM images of the porous nickel oxide prepared according to Example 3. FIGS. 8A and 8B are SEM images of the porous nickel oxide prepared according to Example 4. FIGS. 9A and 9B are SEM images of the porous nickel oxide prepared according to Example 5.

[0058]These results show that the size of the primary particles and the diameters of the pores increase as the temperature increases from a heat tr...

example 6

[0061]14.93 g of nickel (II) acetate tetrahydrate, 3.73 g of cobalt (II) acetate tetrahydrate, and 9.98 g of trimesic acid were added to 500 ml of distilled water and stirred at 55° C. for 2 hours. Powders produced in the solution were removed using a nylon filter, washed with distilled water several times, and then dried in an oven at 80° C. for 12 hours to obtain a needle-shaped coordination polymer crystal.

[0062]The obtained crystalline coordination polymer was subjected to a heat treatment process under an Ar atmosphere at 900° C. for 1 hour to prepare a carbon-(nickel, cobalt) composite, and then subjected to a heat treatment process at 700° C. for 1 hour to prepare a porous Ni0.8Co0.2O material. FIGS. 12A and 12B are SEM images of the prepared porous Ni0.8Co0.2O material.

CROSS-REFERENCE TO RELATED PATENT APPLICATION

[0001] This application claims priority to and the benefit of Korean Patent Application No. 10-2006-0028395 filed on Mar. 29, 2006 in the Korean Intellectual Property Office, the entire content of which is incorporated herein by reference.BACKGROUND OF THE INVENTION

[0002] 1. Field of the Invention

[0003] The present invention relates to a porous metal oxide and a method of preparing the same, and more particularly, to a porous metal oxide having a particle shape that can be easily-controlled and pores having an adjustable shape and distribution, and a method of preparing the same.

[0004] 2. Description of the Related Art

[0005] Porous metal oxides are used as electrode materials in the energy field. In general, electrode materials must have good electronic conductivity and good ionic conductivity, while ionic conductivity is typically lower than electronic conductivity. However, in porous electrode materials, ions can be delivered to the inside o...

Examples

example 1

[0054]37.33 g of nickel (II) acetate tetrahydrate and 19.96 g of trimesic acid were added to 500 ml of distilled water and stirred at 55° C. for 2 hours. Powders produced in the solution were removed using a nylon filter, washed with distilled water several times, and then dried in an oven at 80° C. for 12 hours to obtain a crystalline coordination polymer. FIG. 1 is a scanning electron microscope (SEM) image of the crystalline coordination polymer prepared according to this example.

[0055]The obtained crystalline coordination polymer was subjected to heat treatment under an Ar atmosphere at 600° C. for 1 hour to prepare a carbon-nickel composite having the same shape as the untreated crystalline coordination polymer and a reduced volume. FIG. 2 is a SEM image of the obtained carbon-metal composite.

[0056]FIGS. 3A and 3B are SEM images of a porous nickel oxide obtained by heat treating the obtained carbon-nickel composite in air at 700° C. for 1 hour. FIGS. 3A and 3B show that the oxi...

examples 2 through 5

[0057]Synthesis of the coordination polymer and heat treatment were performed as in Example 1, except that the heat treatment temperature for forming the carbon-metal composite was adjusted from 700 to 1000° C. as listed in Table 1 below.

TABLE 1Heat treatment temperature (° C.)First heatSecond heatSamplePrecursortreatment (Argon)treatment (Air)Example 2Nickel(II) trimesate700700Example 3Nickel(II) trimesate800700Example 4Nickel(II) trimesate900700Example 5Nickel(II) trimesate1000700

FIGS. 6A and 6B are SEM images of the porous nickel oxide prepared according to Example 2. FIGS. 7A and 7B are SEM images of the porous nickel oxide prepared according to Example 3. FIGS. 8A and 8B are SEM images of the porous nickel oxide prepared according to Example 4. FIGS. 9A and 9B are SEM images of the porous nickel oxide prepared according to Example 5.

[0058]These results show that the size of the primary particles and the diameters of the pores increase as the temperature increases from a heat tr...

example 6

[0061]14.93 g of nickel (II) acetate tetrahydrate, 3.73 g of cobalt (II) acetate tetrahydrate, and 9.98 g of trimesic acid were added to 500 ml of distilled water and stirred at 55° C. for 2 hours. Powders produced in the solution were removed using a nylon filter, washed with distilled water several times, and then dried in an oven at 80° C. for 12 hours to obtain a needle-shaped coordination polymer crystal.

[0062]The obtained crystalline coordination polymer was subjected to a heat treatment process under an Ar atmosphere at 900° C. for 1 hour to prepare a carbon-(nickel, cobalt) composite, and then subjected to a heat treatment process at 700° C. for 1 hour to prepare a porous Ni0.8Co0.2O material. FIGS. 12A and 12B are SEM images of the prepared porous Ni0.8Co0.2O material.

Images