Abstract:
A carbon-based material according to the present invention contains dopant atoms of metal and non-metal such as nitrogen. In a radial distribution function obtained by Fourier transform of a K-edge EXAFS of the metal, a ratio of “A” to “B” is equal to or more than 4.0, wherein “A” denotes an intensity of the highest one of peaks around a distance equal to a coordinate bond length between atoms of the metal and the non-metal and “B” denotes an intensity of the highest one of peaks around a distance equal to a metallic bond length between atoms of the metal. Note that when the metal is platinum, in a radial distribution function obtained by Fourier transform of an LIII-edge EXAFS of the platinum, a ratio of “A” to “B” is equal to or more than 4.0.
Abstract:
An electrode catalyst for a water electrolysis cell includes a catalyst, a support, and an organic compound. The catalyst is a layered double hydroxide that contains a chelating agent. The support contains a transition metal. The organic compound has an anionic functional group.
Abstract:
A water electrolyzer includes an electrochemical cell including an anode and a cathode, an electrolyte solution, a heater, a voltage applicator, and a controller. The heater heats the electrolyte solution. The voltage applicator applies a voltage between the anode and the cathode. The electrochemical cell includes nickel. In startup of the water electrolyzer, the controller causes the heater to increase the temperature of the electrolyte solution by heating and causes the voltage applicator to start application of a voltage when the temperature of the electrolyte solution is less than a predetermined threshold value.