Mesoporous carbon and method of producing the same
Provided are a mesoporous carbon and a method of preparing the same, where the mesoporous carbon is prepared using phenanthrene as a carbon source and a mesoporous silica as a template. The mesoporous carbon has a significantly low plane resistance, which can be obtained without sacrificing other physical properties, and thus obtains a high conductivity and effectively transfers electrical energy. Accordingly, a fuel cell electrode or a fuel cell which is produced using the mesoporous carbon as a conductive material has high efficiency. Furthermore, the mesoporous carbon may be used in various electrochemical devices as a conductive material.
1. A method of preparing a mesoporous carbon, the method comprising:
preparing a precursor mixture that contains 5-15 parts by weight of phenanthrene, 10-35 parts by weight of an acid, and 55-80 parts by weight of a solvent based on 100 parts by weight of the precursor mixture;
impregnating a mesoporous silica with the precursor mixture;
heat treating the impregnated mesoporous silica;
carbonizing the heat treated, impregnated mesoporous silica; and
removing the mesoporous silica from the carbonized, heat treated, impregnated mesoporous silica by using a solution that is capable of selectively dissolving the mesoporous silica only.
2. The method of claim 1 , wherein the acid is one of an organic acid or an inorganic acid.
3. The method of claim 1 , wherein the acid is a sulfuric acid, a nitric acid, a phosphoric acid, an organic acid thereof, a hydrochloric acid, or combinations thereof.
4. The method of claim 1 , wherein the solvent is water, acetone, methanol, ethanol, isopropylalcohol, n-propylalcohol, butylalcohol, dimethylacetamid(DMAc), dimethylformamid, dimethylsulfoxide (DMSO), N-methyl-2-pyrrolidone (NMP), tetrahydrofurane (THF), tetrabutylacetate, n-butylacetate, m-crezole, toluene, ethyleneglycol (EG), γ-butyrolactone, hexafluoroisopropanol (HFIP) or combinations thereof.
5. The method of claim 1 , wherein a weight ratio of the phenanthrene to the acid is in a range at or between 1:2.5 and 1:3.5.
6. The method of claim 1 , wherein the amount of the mesoporous silica is in a range at or between 5 and 15 parts by weight based on the 100 parts by weight of the precursor mixture.
7. The method of claim 1 , wherein the preparing of the impregnated mesoporous silica comprises drying the impregnated mesoporous silica.
8. The method of claim 1 , wherein the heat treatment is performed at a temperature at or between 50 and 250° C.
9. The method of claim 8 , wherein the heat treatment comprises a first heat treatment and a second heat treatment sequentially performed, wherein the first heat treatment is performed at a temperature at or between 50 and 150° C. and a second heat treatment is performed at a temperature at or between 150 and 250° C.
10. The method of claim 1 , wherein the preparing of the impregnated mesoporous silica comprises:
again impregnating the heat treated, impregnated mesoporous silica with the precursor mixtures;
again heat treating the impregnated, heat treated, impregnated mesoporous silica to prepare a repeatedly heat treated, impregnated mesoporous silica; and
repeating the again impregnating and the again heat treating zero to nine times.
11. The method of claim 1 , wherein the carbonization is performed at a temperature at or between 700 and 1500° C.
12. The method of claim 1 , wherein the mesoporous silica is removed using one of HF and NaOH solutions.
13. A method of producing a mesoporous carbon, the method comprising:
preparing a precursor mixture of 5-15 parts by weight of phenanthrene, 10-35 parts by weight of an acid, and 55-80 parts by weight of a solvent based on 100 parts by weight of the precursor mixture;
impregnating a mesoporous silica with the precursor mixture;
carbonizing the impregnated mesoporous silica to prepare mesoporous carbon; and
separating the mesoporous carbon from the mesoporous silica.
14. The method of producing a mesoporous carbon as claimed in claim 13 , further comprising:
heat treating the impregnated mesoporous silica prior to carbonizing to prepare a dried impregnated mesoporous silica; and
impregnating the dried impregnated mesoporous silica with the precursor mixture.
15. The method of claim 1 , wherein the precursor mixture consists of 5-15 parts by weight of phenanthrene, 10-35 parts by weight of an acid, and 55-80 parts by weight of a solvent based on 100 parts by weight of the precursor mixture.
16. The method of claim 13 , wherein the precursor mixture consists of 5-15 parts by weight of phenanthrene, 10-35 parts by weight of an acid, and 55-80 parts by weight of a solvent based on 100 parts by weight of the precursor mixture.
17. The method of claim 1 , further comprising:
after removing the mesoporous silica, impregnating the mesoporous carbon with a metal catalyst precursor; and
reducing the metal catalyst precursor to form a supported catalyst comprising metal catalyst particles supported by the mesoporous carbon.
18. The method of claim 17 , comprising:
applying the supported catalyst on an electrode support to form a first electrode; and
sequentially stacking the first electrode, an electrolyte membrane, and a second electrode.
19. The method of claim 13 , further comprising:
after removing the mesoporous silica, impregnating the mesoporous carbon with a metal catalyst precursor; and
reducing the metal catalyst precursor to form a supported catalyst comprising metal catalyst particles supported by the mesoporous carbon.
20. The method of claim 19 , comprising:
applying the supported catalyst on an electrode support to form a first electrode; and
sequentially stacking the first electrode, an electrolyte membrane, and a second electrode.
21. The method of claim 7 , further comprising cooling the dried impregnated mesoporous silica to room temperature before the heat treating of the impregnated mesoporous silica.
22. The method of claim 8 , wherein the heat treatment further comprises slowly heating the impregnated mesoporous silica from room temperature to the temperature at or between 50 and 250° C. over a period of about 1 hour and then maintaining such temperature for about 6 hours to prepare the heat treated, impregnated mesoporous silica.
23. The method of claim 11 , wherein the carbonization further comprises slowly heating the heat treated, impregnated mesoporous silica to the temperature at or between 700 and 1500° C. over a period of about 4 hours and then maintaining such temperature for about 2 hours to prepare the carbonized, heat treated, impregnated mesoporous silica.