Abstract: A catalyst for the reduction of carbon dioxide into carbon monoxide includes tungsten sulfide alone or at least one catalyst support selected from among alumina, silica, activated carbon, zeolite, iron oxide, zirconia, titania, ferrite, yttria thoria, lanthania, neodymia and activated clay and tungsten sulfide deposited on the support. The catalyst is produced, for example, by a method including the steps of adding the support to an aqueous solution of ammonium tetrathiotungstate, an aqueous ammoniacal solution of it or an acid solution of it, drying the resultant solution and heating the resultant dried solid in a current of hydrogen, nitrogen, argon or helium, thereby decomposing the solid.

Abstract: A method for the production of a photoelectrochemical cell includes forming an anion-doped long-chain alkylthiophene polymer layer on one surface of a semiconductor directly or through the medium of a coating of a noble metal formed in advance on said one surface, interposing a solid electrolyte between a transparent electrode and the anion-dope long-chain alkylthiophene polymer on the semiconductor, and finally connecting a lead wire to the other surface of the semiconductor. A photoelectrochemical cell is produced by the method described above and consists essentially of a layer of an anion-doped long-chain alkylthiophene polymer formed on one surface of a semiconductor directly or through the medium of a coating of a noble metal formed in advance, a transparent electrode, and a solid electrolyte interposed between the polymer layer and the transparent electrode.

Abstract: A fuel gas is produced from an aqueous acetone solution by causing the aqueous acetone solution to contact powdered silicon and exposing the resultant product of this contact to light.

Abstract: A shaped article of halogenated polymer which is obtained by causing a halogen to react upon a shaped article of a polymer by irradiation of light is irradiated with light in the presence of an acetylene compound to have the acetylene compound graft polymerized onto the shaped article of polymer.

Abstract: On a silicon semiconductor or a silicon semiconductor having a coating of a noble metal, a polymer film is deposited by immersing the silicon semiconductor or the silicon semiconductor with the noble metal coating in a solution containing a thiophene compound, applying a voltage to the silicon semiconductor as an electrode and, at the same time, exposing the silicon semiconductor to light.

Abstract: A 7-substituted quadricyclene-cyclodextrin inclusion compound is manufactured by irradiating a 7-substituted norbornadiene-cyclodextrin inclusion compound with light.