An unusual battery is proposed in the experiment below. The particularity of this cell is the fact that both electrodes (formal cathode and anode) undergo oxidation phenomenon.
The experiment is very simple: put a piece of Fe and a piece of Zn in a sulfuric acid solution and connect these pieces of metal to an ammeter.
Although both metals are oxidized, an electric current is generated in an external circuit.
The detailed description of the experiment is presented at
You can perform the experiment in the kitchen using same metals and a acetic acid solution (vinegar).