Abstract: Provided is a redox catalyst wherein a catalytically active component is supported on carbon nanotubes whose average diameter (Av) and standard deviation (?) of diameters satisfy the condition 0.60>3?/Av>0.20, and at least a part of a surface of the carbon nanotubes, including a part on which the catalytically active component is supported, is covered with porous inorganic material.

Abstract: Provided is a redox catalyst wherein a catalytically active component is supported on carbon nanotubes whose average diameter (Av) and standard deviation (?) of diameters satisfy the condition 0.60>3?/Av>0.20, and at least a part of a surface of the carbon nanotubes, including a part on which the catalytically active component is supported, is covered with porous inorganic material.

Abstract: An electrode material, including: catalyst particles formed by performing inclusion, by a porous inorganic material, for a conductive support and metal particles arranged on the conductive support and/or metal particles brought into contact with the conductive support.

Abstract: An electrode material, including: catalyst particles formed by performing inclusion, by a porous inorganic material, for a conductive support and metal particles arranged on the conductive support and/or metal particles brought into contact with the conductive support.

Abstract: With a method producing hydrogen by making iron or iron oxide contact water, water vapor, or a gas including water vapor, a hydrogen generating medium, which has a high hydrogen generation reaction rate and is resistant to a repetition of oxidation-reduction without degrading its activity, is provided by adding a different metal (such as Ti, Zr, V, Nb, Cr, Mo, Al, Ga, Mg, Sc, Ni, Cu, etc.) other than the iron to the iron or the iron oxide.

Abstract: A method for reducing a metal oxide and a method for manufacturing hydrogen are provided for easily reducing an oxide of a metal that decomposes water to generate hydrogen, using a gas that includes hydrocarbons, such as municipal gas. The method for reducing the metal oxide includes the step of reducing, using a reducing gas that includes hydrocarbons, a medium comprising an oxide of a metal that decomposes water to generate hydrogen, and at least one metal selected from the group consisting of platinum group elements, copper, nickel and cobalt. Furthermore, the method for manufacturing hydrogen includes the above-described reducing step, and a water-decomposing step of reacting water with the medium that is reduced in the reducing step, to generate hydrogen.

Abstract: A method for producing hydrogen by contacting water, steam or gas containing steam with iron or iron oxide, wherein the iron or iron oxide is added with at least one metal of Rh, Ir, Ru, Pd, Pt and Os and at least one metal of Ti, Zr, V, Nb, Cr, Mo, Al, Ga, Mg, Sc, Ni and Cu. The method provides a medium for producing hydrogen which is capable of producing hydrogen at relatively low temperature and at a great generation rate, is free from the decrease of activity, and is resistance to repeated oxidation and reduction, which leads to the decomposition of water and production of hydrogen with good efficiency.

Abstract: With a method producing hydrogen by making iron or iron oxide contact water, water vapor, or a gas including water vapor, a hydrogen generating medium, which has a high hydrogen generation reaction rate and is resistant to a repetition of oxidation-reduction without degrading its activity, is provided by adding a different metal (such as Ti, Zr, V, Nb, Cr, Mo, Al, Ga, Mg, Sc, Ni, Cu, etc.) other than the iron to the iron or the iron oxide.