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Posted Mon Jun 28 2010: from SciDev.net:
Potato battery could help meet rural energy needs http://apocadocs.com/s.pl?1277726227
The holy grail of renewable energy research may lie in the cooking pot, according to scientists. The search for a cheap source of electricity for remote, off-grid communities, has led to batteries that work on freshly boiled potatoes. One slice of potato can generate 20 hours of light, and several slices could provide enough energy to power simple medical equipment and even a low-power computer, said a research team from the Hebrew University of Jerusalem, Israel. "The technology is ready to go," co-researcher Haim Rabinowitch told SciDev.Net. "It should take an interested body only a short while, and very little investment, to make this available to communities in need." ... The device had the same basic components as conventional batteries, consisting of two electrodes separated by an electrolyte (the potato). Each battery powered a small light for 20 hours, after which a new slice could be inserted.... Potato batteries are estimated to generate energy at a cost of approximately US$9 per kilowatt hour (kW/h), which compares favourably with the best performing 1.5 volt (AA) alkaline cells -- or D cells -- which generate energy at US$50/kWh.
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