TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Components: The reaction sections have a reaction plate having the channel and a catalyst layer formed in the channel of the reaction plate. The bonding joint is formed in contact portions between the reaction plates and contact portions between the at least one of the reaction plates and the at least one cover plate to bond the reaction plates and the at least one cover plate to each other. The bonding joint is formed on edges of the reaction plates and edges of the at least one cover plate. A gasket having an opening corresponding to the channel is disposed between the reaction plates and between the at least one of the reaction plates and the at least one cover plate. The reaction sections include a heat source for generating thermal energy through an oxidation catalytic reaction of a fuel and air; and a reforming reactor, where the reforming reactor is supplied with fuel independent of the heat source and absorbs the thermal energy from the heat source to generate hydrogen gas. The reforming reactor and the at least one cover plate are respectively stacked on the heat source. The cover plate comprises cover plates and where each of the cover plates is stacked on a respective one of reaction sections. The reaction sections further include a carbon-monoxide reducer for reducing a concentration of carbon monoxide contained in the hydrogen gas.    TECHNOLOGY FOCUS - METALLURGY - Preferred Materials: The bonding joint is made of metal. The metal constituting the bonding joint has a melting point lower than that of a material constituting the reaction plates and the at least one cover plate. The metal constituting the bonding joint comprises a material such as copper, stainless steel, aluminum, nickel, iron, or their alloys. Each of the reaction sections has a reaction plate made of a material selected from the group consisting of stainless steel, aluminum, nickel, and/or iron. The cover plate is made of stainless steel, aluminum, nickel, and/or iron.Preferred Method: The bonding joint is formed using a brazing method. The reaction sections and the cover plate are heated to 500-900degreesC to melt the at least one metal film.    TECHNOLOGY FOCUS - POLYMERS - Preferred Materials: The bonding joint is made of a sealing material. The gasket comprises a material such as Teflon, and/or metal.