abstract |
An object of the invention is to provide a hydrogen-releasing film which rarely undergoes the deterioration in hydrogen-releasing performance even when used for a long period. In addition, it is another object of the present invention to provide a safety valve for an electrochemical element, wherein the valve is provided with the hydrogen-releasing film, and to provide an electrochemical element having the safety valve. A hydrogen-releasing film having a metal layer, wherein at least one surface of the hydrogen-releasing film has a water contact angle of 85° or more. |