Abstract: A conductive film includes a metal oxide as a main component. The metal oxide contains the same components as components of a compound represented by a formula (I): (AO)2B6O11??(I) where A in the formula (I) is a metal element capable of having a valence of +1 or +2, B in the formula (I) is a transition metal element capable of having a valence of +4 or +5, O in the formula (I) is an oxygen element, and an average valence of B in the formula (I) is less than the maximum oxidation number of B. The metal oxide has a crystal structure in which diffraction peaks in an X-ray diffraction pattern of the metal oxide appear at same diffraction angles as diffraction angles at which diffraction peaks in an X-ray diffraction pattern of the compound represented by the formula (I) appear.

Abstract: A hydrogen generator includes a reaction vessel, a water supply, a temperature adjustor, and a controller. The reaction vessel houses a hydrogen generating material having hydrogen generating ability. The hydrogen generating material includes a two-dimensional hydrogen boride sheet having a two-dimensional network and containing multiple negatively charged boron atoms. The controller is configured to execute a hydrogen generating mode to generate hydrogen from the hydrogen generating material and a regenerating mode to recover the hydrogen generating ability of the hydrogen generating material. The controller controls the temperature adjustor to heat the hydrogen generating material at a first predetermined temperature during the hydrogen generating mode. The controller controls the temperature adjustor to adjust the temperature of the hydrogen generating material to a second predetermined temperature and controls the water supply to supply water during the regenerating mode.

Abstract: A hydrogen generator includes a reaction vessel, a water supply, a temperature adjustor, and a controller. The reaction vessel houses a hydrogen generating material having hydrogen generating ability. The hydrogen generating material includes a two-dimensional hydrogen boride sheet having a two-dimensional network and containing multiple negatively charged boron atoms. The controller is configured to execute a hydrogen generating mode to generate hydrogen from the hydrogen generating material and a regenerating mode to recover the hydrogen generating ability of the hydrogen generating material. The controller controls the temperature adjustor to heat the hydrogen generating material at a first predetermined temperature during the hydrogen generating mode. The controller controls the temperature adjustor to adjust the temperature of the hydrogen generating material to a second predetermined temperature and controls the water supply to supply water during the regenerating mode.