Abstract: A method for producing a thin film according to the present disclosure comprises a step of forming the thin film on a substrate using a target. The target is formed of a mixture containing a first material and a second material. The first material has a composition represented by ATiO3 (where A is at least one selected from the group consisting of Ba and Sr). The second material has a composition represented by EH2 (where E is at least one selected from the group consisting of Ti and Zr). The thin film is formed of a first oxide containing A, Ti, and O. Some of oxide ions contained in the first oxide have been replaced by hydride ions.

Abstract: The desorbing process of the present disclosure includes a step of bringing a solution containing a hydrogenated aromatic compound, at least one of [P((CH2)mCH3)3((CH2)nCH3) (5?m?24, 13?n?24)]+ and [N((CH2)mCH3)3((CH2)nCH3) (5?m?24, 13?n?24)]+, and an anion into contact with an anode; and desorbing hydrogen from the hydrogenated aromatic compound.

Abstract: A hydrogen desorption method includes a step of bringing a liquid containing an alicyclic saturated hydrocarbon having a tertiary carbon atom bearing a saturated hydrocarbon side chain, a quinone, and an electrolyte into contact with a anode and a step of desorbing hydrogen from the alicyclic saturated hydrocarbon having a tertiary carbon atom bearing a saturated hydrocarbon side chain.

Abstract: An exemplary proton conductor according to the present disclosure has a perovskite-type crystal structure expressed by the compositional formula AaB1-xB?xO3-?, where A is at least one selected from among group 2 elements; B is a group 4 element or Ce; B? is a group 3 element, a group 13 element, or a lanthanoid element; 0.5<a?1.0, 0.0?x?0.5, and 0.0??<3; and the charge of the above compositional formula is deviated from electrical neutrality in a range of ?0.13 or more but less than +0.14.

Abstract: An exemplary dehydrogenation device for generating a hydrogen gas through dehydrogenation according to the present disclosure comprises an anode containing a dehydrogenation catalyst, a cathode containing catalyst capable of reducing protons, and a proton conductor disposed between the anode and the cathode. The proton conductor has a perovskite crystal structure expressed by the compositional formula AaB1-xB?xO3-?. The A element is an alkaline-earth metal and is contained in a range of 0.4<a<0.9, where the a value represents a mole fraction of this element, and the B? element is a trivalent group 3 or group 13 element and is contained in a range of 0.2<x<0.6, where the x value represents a mole fraction of this element.

Abstract: The desorbing process of the present disclosure includes a step of bringing a solution containing a hydrogenated aromatic compound, at least one of [P((CH2)mCH3)3((CH2)nCH3) (5?m?24, 13?n?24)]+ and [N((CH2)mCH3)3((CH2)nCH3) (5?m?24, 13?n?24)]+, and an anion into contact with an anode; and desorbing hydrogen from the hydrogenated aromatic compound.

Abstract: A hydrogen desorption method includes a step of bringing a liquid containing an alicyclic saturated hydrocarbon having a tertiary carbon atom bearing a saturated hydrocarbon side chain, a quinone, and an electrolyte into contact with a anode and a step of desorbing hydrogen from the alicyclic saturated hydrocarbon having a tertiary carbon atom bearing a saturated hydrocarbon side chain.

Abstract: An exemplary proton conductor according to the present disclosure has a perovskite-type crystal structure expressed by the compositional formula AaB1?xB?xO3??, where A is at least one selected from among group 2 elements; B is a group 4 element or Ce; B? is a group 3 element, a group 13 element, or a lanthanoid element; 0.5<a?1.0, 0.0?x?0.5, and 0.0??<3; and the charge of the above compositional formula is deviated from electrical neutrality in a range of ?0.13 or more but less than +0.14.

Abstract: An exemplary proton conductor according to the present disclosure has a perovskite-type crystal structure expressed by the compositional formula AaB1-xB?xO3-?, where A is at least one selected from among group 2 elements; B is a group 4 element or Ce; B? is a group 3 element, a group 13 element, or a lanthanoid element; 0.5<a?1.0, 0.0?x?0.5, and 0.0??<3; and the charge of the above compositional formula is deviated from electrical neutrality in a range of ?0.13 or more but less than +0.14.

Abstract: A proton conductor includes an electrolytic layer having first and second main surfaces; and a plurality of catalyst particles. The first main surface of the electrolytic layer includes a flat portion and a plurality of recessed portions. The plurality of catalyst particles are respectively located in the plurality of recessed portions. The flat portion of the first main surface and parts of surfaces of the plurality of catalyst particles exposed from the plurality of recessed portions form a third main surface. The electrolytic layer is formed of a single crystal of a perovskite-type oxide having a proton conductivity. The catalyst particles are formed of a single crystal of a noble metal material. The perovskite-type oxide of the electrolytic layer) has a crystal orientation that matches a crystal orientation of the noble metal material of the plurality of catalyst particles.

Abstract: An exemplary organic hydride conversion device for generating a hydrogen gas through organic hydride conversion according to the present disclosure comprises an anode containing a dehydrogenation catalyst, a cathode containing hydrogenation catalyst, and a proton conductor disposed between the anode and the cathode. The proton conductor has a perovskite crystal structure expressed by the compositional formula AaB1-xB?xO3-x. The A element is an alkaline-earth metal and is contained in a range of 0.4<a<0.9, where the a value represents a mole fraction of this element, and the B? element is a trivalent group 3 or group 13 element and is contained in a range of 0.2<x<0.6, where the x value represents a mole fraction of this element.

Abstract: An exemplary proton conductor according to the present disclosure has a perovskite-type crystal structure expressed by the compositional formula AaB1-xB?xO3-?. The A element is an alkaline-earth metal and is contained in a range of 0.4<a<0.9, where the a value represents a mole fraction of this element, and the B? element is a trivalent group 3 or group 13 element and is contained in a range of 0.2<x<0.6, where the x value represents a mole fraction of this element.

Abstract: The present invention provides a proton-conducting oxide comprising a perovskite crystal structure represented by a composition formula AaB1?xB?xO3-?. A represents strontium. B represents zirconium. B? represents at least one selected from the group consisting of yttrium and ytterbium. The value of a is more than 0.84 and less than 1.0. The value of x is more than 0.0 and less than 0.2. The present invention provides a proton-conducting oxide having a capability to maintain high proton conductivity even if the proton-conducting oxide is exposed to the air atmosphere for a long time.

Abstract: An exemplary organic hydride conversion device for generating a hydrogen gas through organic hydride conversion according to the present disclosure comprises an anode containing a dehydrogenation catalyst, a cathode containing hydrogenation catalyst, and a proton conductor disposed between the anode and the cathode. The proton conductor has a perovskite crystal structure expressed by the compositional formula AaB1-xB?xO3-x. The A element is an alkaline-earth metal and is contained in a range of 0.4<a<0.9, where the a value represents a mole fraction of this element, and the B? element is a trivalent group 3 or group 13 element and is contained in a range of 0.2<x<0.6, where the x value represents a mole fraction of this element.

Abstract: An exemplary dehydrogenation device for generating a hydrogen gas through dehydrogenation according to the present disclosure comprises an anode containing a dehydrogenation catalyst, a cathode containing catalyst capable of reducing protons, and a proton conductor disposed between the anode and the cathode. The proton conductor has a perovskite crystal structure expressed by the compositional formula AaB1-xB?xO3-?. The A element is an alkaline-earth metal and is contained in a range of 0.4<a<0.9, where the a value represents a mole fraction of this element, and the B? element is a trivalent group 3 or group 13 element and is contained in a range of 0.2<x<0.6, where the x value represents a mole fraction of this element.

Abstract: An exemplary proton conductor according to the present disclosure has a perovskite-type crystal structure expressed by the compositional formula AaB1-xB?xO3-?, where A is at least one selected from among group 2 elements; B is a group 4 element or Ce; B? is a group 3 element, a group 13 element, or a lanthanoid element; 0.5<a?1.0, 0.0?x?0.5, and 0.0??<3; and the charge of the above compositional formula is deviated from electrical neutrality in a range of ?0.13 or more but less than +0.14.

Abstract: A proton conductor includes an electrolytic layer having first and second main surfaces; and a plurality of catalyst particles. The first main surface of the electrolytic layer includes a flat portion and a plurality of recessed portions. The plurality of catalyst particles are respectively located in the plurality of recessed portions. The flat portion of the first main surface and parts of surfaces of the plurality of catalyst particles exposed from the plurality of recessed portions form a third main surface. The electrolytic layer is formed of a single crystal of a perovskite-type oxide having a proton conductivity. The catalyst particles are formed of a single crystal of a noble metal material. The perovskite-type oxide of the electrolytic layer) has a crystal orientation that matches a crystal orientation of the noble metal material of the plurality of catalyst particles.

Abstract: The present invention provides an oxide film composed of an oxide having a perovskite crystal structure. The oxide is represented by a chemical formula A1-x(E1-yGy)Oz. A represents at least one element selected from the group consisting of Ba, Sr, and Ca. E represents at least one element selected from the group consisting of Zr, Hf, In, Ga, and Al. G represents at least one element selected from the group consisting of Y, La, Ce, and Gd. All of the following five mathematical formulae are satisfied: 0.2?x?0.5, 0.1?y?0.7, z<3, 0.3890 nanometers?a?0.4190 nanometers, 0.95?a/c<0.98. Each of a, b and c represents a lattice constant of the perovskite crystal structure. Either the following mathematical formula is satisfied: a?b<c or a<b?c.

Abstract: An exemplary proton conductor according to the present disclosure has a perovskite-type crystal structure expressed by the compositional formula AaB1-xB?xO3-?. The A element is an alkaline-earth metal and is contained in a range of 0.4<a<0.9, where the a value represents a mole fraction of this element, and the B? element is a trivalent group 3 or group 13 element and is contained in a range of 0.2<x<0.6, where the x value represents a mole fraction of this element.

Abstract: The method for reducing carbon dioxide of the present invention includes a step (a) and a step (b) as follows. A step (a) of preparing an electrochemical cell. The electrochemical cell comprises a working electrode (21), a counter electrode (23) and a vessel (28). The vessel (28) stores an electrolytic solution (27). The working electrode (21) contains boron carbide. The electrolytic solution (27) contains carbon dioxide. The working electrode (21) and the counter electrode (23) are in contact with the electrolytic solution (27). A step (b) of applying a negative voltage and a positive voltage to the working electrode and the counter electrode, respectively, to reduce the carbon dioxide.