System and method for unmanned vehicle fuel cell

The present invention provides system, method and the device of the accessory substance for removing fuel cell from delivery vehicle.The delivery vehicle includes fuel cell (530) and exhaust system (560).The fuel cell (530) connects with fuel reserve container (510).The fuel is configured for making the first fuel from the fuel reserve container (510) and the second fuel reaction produce electric power and accessory substance by electrochemical reaction.The exhaust system (560) is configured for the accessory substance being exposed to forced convertion.