Abstract: A hydrogen quantity sensor can directly measure hydrogen contained in a hydrogen storage device with simple and easy means. The hydrogen quantity sensor comprises a detecting electrode comprised of a hydrogen storage alloy disposed inside a hydrogen storage vessel, a standard electrode disposed to confront the detecting electrode; and an electrolyte member disposed between the detecting electrode and the standard electrode. The detecting electrode, the standard electrode and the electrolyte member constitute a sensor portion to measure hydrogen concentration within the hydrogen storage alloy as an electromotive force value.

Abstract: It is an object of the present invention to provide a hydrogen quantity sensor that can directly measure hydrogen contained in a hydrogen storage device with simple and easy means. The hydrogen quantity sensor comprises a detecting electrode 30 comprised of a hydrogen storage alloy 18 disposed inside a hydrogen storage vessel 10, a standard electrode 28 disposed to confront the detecting electrode 30; and an electrolyte member 26 disposed between the detecting electrode 30 and the standard electrode 28. The detecting electrode 30, the standard electrode 28 and the electrolyte member 26 constitute a sensor portion 32 to measure hydrogen concentration within the hydrogen storage alloy 18 as an electromotive force value.

Abstract: The object of the present invention is to provide a hydrogen gas sensor that may suffer less influences from the environmental space as well as exercise less influence to the environmental space. The hydrogen gas sensor 10 comprises a first electrode 12 and a second electrode 14 are provided, and an electrolyte 16 disposed between the first electrode 12 and the second electrode 14. The first electrode and the second electrode are made of corresponding different materials in chemical potential for hydrogen gas. That is, the first electrode includes a relatively high chemical potential material, and the second electrode includes a relatively low chemical potential material. The hydrogen gas sensor detects hydrogen gas based on the electromotive force generated between these electrodes and, at least a contacting portion of the electrolyte with the first electrode and a contacting portion of the electrolyte with the second electrode are covered with a hydrogen selective permeable envelope 20.