Abstract: A gas diffusion simulation method for simulating diffusion of a gas in a porous material having many pores, the method includes: calculating, in the pores, a Knudsen diffusion coefficient based on the mean square displacement of first gas particles in spaces surrounded by wall surfaces and a Knudsen diffusion term using the Knudsen diffusion coefficient, calculating an interdiffusion term using an interdiffusion coefficient between the first gas particles and second gas particles different therefrom, and performing simulation of the gas diffusion of the first gas particles by using a diffusion equation of the first gas particles represented by the sum of the Knudsen diffusion term and the interdiffusion term.

Abstract: A hydrogen system includes: a compressor in which protons extracted from an anode fluid supplied to an anode move to a cathode through an electrolyte membrane and compressed hydrogen is generated; and a first eliminator including: a water-permeable membrane; a cathode gas flow path through which a cathode gas discharged from the cathode of the compressor flows, the cathode gas flow path being provided on one main surface of the water-permeable membrane; and an accommodation portion provided on the other main surface of the water-permeable membrane and filled with a liquid at a pressure lower than that of the cathode gas. The first eliminator removes moisture contained in the cathode gas.

Abstract: A gas diffusion simulation method for simulating diffusion of a gas in a porous material having many pores, the method includes: calculating, in the pores, a Knudsen diffusion coefficient based on the mean square displacement of first gas particles in spaces surrounded by wall surfaces and a Knudsen diffusion term using the Knudsen diffusion coefficient, calculating an interdiffusion term using an interdiffusion coefficient between the first gas particles and second gas particles different therefrom, and performing simulation of the gas diffusion of the first gas particles by using a diffusion equation of the first gas particles represented by the sum of the Knudsen diffusion term and the interdiffusion term.

Abstract: The method for manufacturing a photosemiconductor according to the present disclosure includes treating a metal base material containing at least one kind of transition metal with a plasma under a pressure lower than atmospheric pressure and at a temperature lower than a volatilization temperature of the transition metal under an atmosphere at the pressure to provide the photosemiconductor containing the transition metal and a nitrogen element from at least a part of the metal base material. Here, the plasma is generated by applying a high-frequency voltage at a frequency in a range of not less than 30 MHz and not more than 300 MHz to a gas between a first electrode and a second electrode, and the gas is any one of: (i) a nitrogen gas; (ii) a gaseous mixture consisting of a nitrogen gas and an oxygen gas; (iii) a gaseous mixture consisting of a nitrogen gas and a rare gas; and (iv) a gaseous mixture consisting of a nitrogen gas, an oxygen gas, and a rare gas.

Abstract: The present invention provides a method for fabricating an electrode comprising a co-catalyst layer for splitting water with light. The method comprises steps of (a) forming a catalyst layer containing at least one selected from the group consisting of a niobium-containing oxynitride and a niobium-containing nitride on an electrically conductive principal surface of a substrate; (b) forming a transition metal oxide layer on the catalyst layer in an inert gas atmosphere containing oxidized gas impurities to provide a stacking structure comprising the substrate, the catalyst layer, and the transition metal oxide layer; (c) immersing the stacking structure in an electrolyte aqueous solution; and (d) applying a positive electric potential to the stacking structure in the electrolyte aqueous solution to convert the transition metal oxide layer into the co-catalyst layer. The present invention provides an electrode for water splitting having high water-splitting efficiency.