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How can metal foil make electricity?

April 26, 2017electricity foil metal

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How can metal foil make electricity?

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I found an old platinum ring in a car park, cut it and beat a section into two strips of foil approx 100mmX2mmX0.3mm. Just holding these under the water tap connected to a multimeter shows one tenth of a volt. Still water is not so good, the voltage drops very quickly. Greater surface area greater voltage I guess. At a microscopic level I guess the catalyst is turning water to Oxygen and Hydrogen and giving off electrons.