Alternative energy source

Friends! A few experiments about alternative energy sources. I used a thermoelectric Converter that creates electrical energy from the temperature difference, a salt battery, the electrical energy in which is formed due to the difference in the rate of chemical reaction , and a solution of salt in water is used as the electrolyte. I also used a solar panel that works based on the effects of the photo effect, in this case , based on the external photo effect. You can find the theory for these and other exper