Device for producing energy and use thereof

A double-layer biological battery for producing energy, comprising:

• a lower compartment, having said compartment a lower part which is the anode and a higher part which is the cathode, and further containing wet substrate between said lower part and said higher part, wherein said wet substrate contains at least one electrogenic microorganism and at least one electron donor;
• an outdoor opened upper compartment in contact with an environment capable of supplying at least one electron donor and configured to transfer a liquid to the lower compartment through conductive means and;
• conductive means for delivering at least one electron acceptor from outdoors to said cathode of the lower compartment through a gap between the lower and the upper compartment;
• and
• at least one filter with a pore size above 0.2 μm.