A startup that is striving to bring energy to countries that lack
reliable power has developed a remarkably simple new microbial
fuel-cell design: grain bags, stuffed with metal and dirt.
Leb??n??, a startup based at Harvard University, has already shown
how to make fuel cells from buckets full of wastewater, with a
graphite cloth as the anode and chicken wire as the cathode. In
this setup, bacteria extract electrons from organic waste at the
anode to generate small amounts of power--enough to charge, say, a
flashlight or cell phone.
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~Crystal D. Hartman