Member for hydrogen production and hydrogen production apparatus

Patent metadata

Field	Value
Publication number	US-2018370794-A1
Application number	US-201616061685-A
Country	US
Kind code	A1
Filing date	Nov 15, 2016
Priority date	Dec 14, 2015
Publication date	Dec 27, 2018
Grant date	—

Abstract

A member for hydrogen production includes a ceramic composite in which a plurality of ceramic particles having an average particle diameter ranging from 5 nm to 200 nm are dispersed in a porous insulator having a different component from the ceramic particles. The ceramic particles comprise at least one substance selected from the group consisting of AXO 3±δ (where 0≤δ≤1, A: at least one of rare earth elements, alkaline earth elements, and alkali metal elements, X: at least one of transition metal elements and metalloid elements, and O: oxygen), cerium oxide, and zirconium oxide as a main component.

First claim

1 . A member for hydrogen production, the member comprising:
a ceramic composite comprising a plurality of ceramic particles having an average particle diameter ranging from 5 nm to 200 nm; wherein the plurality of ceramic particles are dispersed in a porous insulator having a different composition from the ceramic particles, wherein the ceramic particles comprise at least one substance selected from the group consisting of AXO 3±δ (where 0≤δ≤1, wherein A represents at least one of rare earth elements, alkaline earth elements, alkali metal elements, and combinations thereof; wherein X represents at least one of transition metal elements, metalloid elements, and combinations thereof and wherein O represents oxygen), cerium oxide, and zirconium oxide.

2 . The member for hydrogen production according to claim 1 , wherein the proportion of the ceramic particles in the ceramic composite ranges from 20% by volume to 80% by volume.

3 . The member for hydrogen production according to claim 1 , wherein a number of ceramic particles of the plurality of ceramic particles existing in an isolated state is 90% or more.

4 . The member for hydrogen production according to claim 1 , wherein a light absorbing member is provided on the ceramic composite.

5 . The member for hydrogen production according to claim 4 , wherein the light absorbing member is a metal particle-containing composite in which metal particles are dispersed in a dielectric substance or a metal-based film laminated product in which a metal-based film and a dielectric substance are laminated.

6 . The member for hydrogen production according to claim 4 , wherein a metal film is provided between the ceramic composite and the light absorbing member.

7 . A hydrogen production apparatus according to claim 4 , further comprising:
a reaction unit configured to cause oxidation-reduction reactions by receiving solar energy, a water supply unit configured to supply water to the reaction unit, and a recovery unit configured to recover hydrogen gas generated from the reaction unit, wherein the member for hydrogen production is provided in the reaction unit.

8 . The hydrogen production apparatus according to claim 7 , further comprising a pressure-reducible container; wherein the reaction unit is contained in the pressure-reducible container.

9 . The hydrogen production apparatus according to claim 8 , wherein the pressure-reducible container comprises two or more intake ports.

10 . The hydrogen production apparatus according to claim 9 , wherein one of the two intake ports is used for reducing pressure inside the pressure-reducible container and the other is used for reducing pressure inside the reaction unit.

11 . The hydrogen production apparatus according to claim 8 , wherein the pressure-reducible container is provided with a window for taking in sunlight.

12 . The hydrogen production apparatus according to claim 7 , wherein the reaction unit is a flat plate type laminated structure in which the ceramic composite having a flat plate-like shape is sandwiched from an upper side and a lower side by the light absorbing members having a flat plate-like shape.

13 . The hydrogen production apparatus according to claim 7 , wherein the reaction unit is a hollow cylindrical laminated structure in which the ceramic composite having a cylindrical shape is surrounded by the light absorbing member having a cylindrical shape.

14 . The hydrogen production apparatus according to claim 13 , wherein the hollow cylindrical laminated structure is a non-coaxial structure in which a central axis of a section of the cylindrical ceramic composite does not overlap with a central axis of a section of the cylindrical light absorbing member.

15 . The hydrogen production apparatus according to claim 7 , wherein a hydrogen absorbing member is provided adjacent to the reaction unit.

Assignees

• Kyocera Corp

Inventors

• Akiyama Masahide
• Ohkuma Takeshi

Classifications

• C04B2235/3244

  Zirconium oxides, zirconates, hafnium oxides, hafnates, or oxide-forming salts thereof · CPC title

• C04B2235/5454

  nanometer sized, i.e. below 100 nm · CPC title

• C01B3/061 Primary

  by reaction of water with metal oxides · CPC title

• C04B2235/3229

  Cerium oxides or oxide-forming salts thereof · CPC title

• C04B35/50

  based on rare-earth compounds {(non-oxide rare earth compounds C04B35/5156)} · CPC title