The Empa battery was developed by scientists from a Swiss institute. The battery is intended to be used
Each Empa cell is 1 cm² in size, and its paper base is impregnated with sodium chloride (common salt). There is a wax coating on one end to which two wires are attached.
One side of the paper is coated with ink containing graphite flakes, which act as a cathode. On the other side, the ink with zinc powder is the anode.
Next, the ink on both sides is covered with another layer of paint containing graphite flakes and soot - this connects the cathode and anode with two wires at one end.
If you apply a little water to the battery, it willdissolves salt in paper and releases charged ions. When these ions begin to migrate through the wet layer of paper to the other side of the plate, they cause the zinc in the anode to oxidize, releasing electrons.
As a result, these redox reactions generate an electrical current that can be used to power an external electrical device.
In lab testing, the dual-cell version of the battery was successfully able to power a small LCD alarm clock.
Just two drops of water are enough toactivate one item within 20 seconds. The voltage on the battery reached 1.2 volts. The performance of the cell dropped significantly after an hour—as the paper dried—although it could maintain an operating voltage of 0.5 volts for another hour after two more drops of water were applied to it.
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