"MEMS: Microfluidic battery runs on water"
Converting hydrostatic pressure directly into electrical current � without moving parts like a fuel cell � has enabled the demonstration of a new kind of battery. The electrokinetic microchannel battery prototype harnessed the combined sub-nanoamp electrical output from 500,000 microfluidic channels to generate microamps of current.
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Text: http://www.eetimes.com/story/OEG20031023S0044