Porous body and manufacturing method therefor
View Patent ↗It is an object of the present invention to provide a porous body containing an oxide semiconductor in which more efficient photocatalytic reactions and photoelectrode reactions occur. The present invention relates to a porous body having a network structure skeleton wherein 1) the aforementioned skeleton is composed of an inner part and a surface part, 2) the aforementioned inner part is substantially made of carbon material, and 3) all or part of the aforementioned surface part is an oxide semiconductor, and to a manufacturing method therefor.
1. A method for manufacturing an oxide semiconductor/carbon porous body which has a network structure skeleton, 1) the skeleton being composed of an inner part and a surface part, 2) the inner part being substantially made of carbon material, and 3) all or part of the surface part being an oxide semiconductor, the manufacturing method comprising:
(1) Step 1 of obtaining a composite wet gel by coating the skeleton in a carbon precursor-containing wet gel having a network structure skeleton with an oxide semiconductor precursor;
(2) Step 2 of obtaining a composite dry gel by drying the composite wet gel; and
(3) Step 3 of obtaining an oxide semiconductor/carbon composite porous body by heat-treating the composite dry gel.
2. The manufacturing method according to claim 1 , wherein the heat treatment is performed in an atmosphere of oxygen concentration 0 to 10% by volume.
3. The manufacturing method according to claim 1 , wherein the heat treatment is performed in an inert gas atmosphere.
4. The manufacturing method according to claim 1 , further comprising a step of imparting a co-catalyst and/or dye.
5. The manufacturing method according to claim 1 , wherein the carbon precursor comprises an organic polymer.
6. The manufacturing method according to claim 5 , wherein the organic polymer is at least one of polyacrylonitrile, polyfurfuryl alcohol, polyimide, polyamide, polyamidimide, polyurethane, polyurea, polyphenol, polyaniline and polyparaphenylene.
7. A method for manufacturing a porous body which has a network structure skeleton, 1) the skeleton being composed of an inner part and a surface part, 2) the inner part being substantially made of carbon material, and 3) all or part of the surface part being an oxide semiconductor, the manufacturing method comprising:
(1) Step 1 of obtaining a dry gel having a network structure skeleton by drying a wet gel containing a carbon precursor and having a network structure skeleton;
(2) Step 2 of obtaining a composite precursor by coating the skeleton in the dry gel with an oxide semiconductor; and
(3) Step 3 of obtaining an oxide semiconductor/carbon composite porous body by heat-treating the composite precursor.
8. The manufacturing method according to claim 7 , wherein the heat treatment is performed in an atmosphere of oxygen concentration 0 to 10% by volume.
9. The manufacturing method according to claim 7 , wherein the heat treatment is performed in an inert gas atmosphere.
10. The manufacturing method according to claim 7 , further comprising a step of imparting a co-catalyst and/or dye.
11. The manufacturing method according to claim 7 , wherein the carbon precursor comprises an organic polymer.
12. The manufacturing method according to claim 11 , wherein the organic polymer is at least one of polyacrylonitrile, polyfurfuryl alcohol, polyimide, polyamide, polyamidimide, polyurethane, polyurea, polyphenol, polyaniline and polyparaphenylene.
13. A method for manufacturing a porous body which has a network structure skeleton, 1) the skeleton being composed of an inner part and a surface part, 2) the inner part being substantially made of carbon material, and 3) all or part of the surface part being an oxide semiconductor, the manufacturing method comprising:
(1) Step 1 of obtaining a dry gel having a network structure skeleton by drying a wet gel containing a carbon precursor and having a network structure skeleton;
(2) Step 2 of obtaining a carbon porous body by carbonizing the dry gel, and
(3) Step 3 of obtaining an oxide semiconductor/carbon composite porous body by coating the skeleton in the carbon porous body with an oxide semiconductor.
14. The manufacturing method according to claim 13 , wherein the carbonization is performed in an atmosphere of oxygen concentration 0 to 10% by volume.
15. The manufacturing method according to claim 13 , wherein the carbonization is performed in an inert gas atmosphere.
16. The manufacturing method according to claim 13 , further comprising a step of imparting a co-catalyst and/or dye.
17. The manufacturing method according to claim 13 , wherein the carbon precursor comprises an organic polymer.
18. The manufacturing method according to claim 17 , wherein the organic polymer is at least one of polyacrylonitrile, polyfurfuryl alcohol, polyimide, polyamide, polyamidimide, polyurethane, polyurea, polyphenol, polyaniline and polyparaphenylene.