Abstract: According to one embodiment, provided is an active material including a composite oxide having a tetragonal crystal structure. The composite oxide is represented by general formula LiaTibNb2?2dMc+2dO2b+5+3c. Here, M is one selected from the group consisting of W and Mo, 0?a?b+4+3c, 0<b<2?2d, and 0<c<2?4d.

Abstract: A device for supporting deterioration determination includes: a first calculating unit that: acquires a dataset including a plurality of reaction condition values and a voltage in a first period and in a second period; and uses the dataset and a calculation formula to calculate a parameter group of the calculation formula for each period; a second calculating unit that substitutes a reaction condition value in the calculation formula in which the parameter group is incorporated to calculate a comparison target value for each period; and a third calculating unit that calculates a deterioration degree of the water electrolysis module based on a difference between a first comparison target value and a second comparison target value.

Abstract: A method for controlling a hydrogen generation system includes controlling the potentials of an electrode for oxygen generation and an electrode for hydrogen generation included in an electrolyzer so that the potential change is smaller in the electrode for oxygen generation or the electrode for hydrogen generation having a larger deterioration rate than in the electrode having a smaller deterioration rate.

Abstract: The method for controlling an organic hydride generation system includes controlling potentials in an anode electrode and a cathode electrode such that a potential change in an electrode having a higher deterioration rate among the anode electrode and the cathode electrode included in an electrolytic bath is smaller than a potential change in an electrode having a lower deterioration rate.

Abstract: There is provided a membrane electrode assembly including an anode gas diffusion layer included in an anode and a cathode gas diffusion layer included in a cathode, wherein the anode gas diffusion layer includes an anode gas diffusion substrate and an anode microporous layer disposed on a first surface of the anode gas diffusion substrate, wherein the cathode gas diffusion layer includes a cathode gas diffusion substrate and a cathode microporous layer disposed on a first surface of the cathode gas diffusion substrate, and wherein at least one of a strike-through ratio on a second surface of the anode gas diffusion substrate and a strike-through ratio on a second surface of the cathode gas diffusion substrate is larger than 0.2%.

Abstract: A gas diffusion layer comprises a gas diffusion substrate having a first surface and a second surface formed opposite to the first surface; and a microporous layer containing a conductive powder and disposed on the first surface of the gas diffusion substrate and in the gas diffusion substrate, wherein the microporous layer is continuous in a thickness direction of the gas diffusion substrate, an amount of the microporous layer on a cross section perpendicular to the thickness direction is maximum at a first cross-sectional position in the thickness direction and decreases from the first cross-sectional position toward the second surface, an amount of the microporous layer included in a region on the first surface side of a central position of the gas diffusion substrate in the thickness direction is 80% or more of an amount of the entire microporous layer, and the microporous layer extends to the second surface.

Abstract: A polymer electrolyte fuel cell includes an electrolyte, a first electrode and a second electrode. The first electrode is provided with a catalyst layer which has a catalytic function, a conductive material and a water management layer which is conductive and which manages water moving between the catalyst layer and the base material.