.With electricigens, however, it becomes possible
to make microbial fuel cells, which offer
potential advantages over hydrogen fuel
cells. For example, hydrogen fuel cells require
a very pure source of a highly explosive
gas that is difficult to store and distribute.
Furthermore, hydrogen is derived
mainly from fossil fuel rather than renewable
sources. In contrast, the energy sources
for microbial fuel cells are renewable organics,
including some that are dirt cheap