Salt battery. Physics and Engineering. Alternative energy.

Friends! I did an experiment with a salt power source. A zinc plate is used as the cathode, and the second electrode has not yet been recognized. As an electrolyte, a solution of ordinary table salt with water was used. The fan turned without damping, which indicates a constant current when the area of the zinc plate changes, the current changes. What do you think the second electrode used in this experiment is made of? Write Your answer in the comments and subscribe to my channel! Sincerely, Yuri Kovalenok