When fuel cells were first suggested and discussed back in the nineteenth century, it was firmly hoped that distinctly higher efficiencies could be attained with them when converting the chemical energy of natural fuels to electric power. Now that the world supply of fossil fuels is seen to be finite, this hope turns into a need, into a question of maintaining advanced standards of life. Apart from conversion efficiency, fuel cells have other aspects which make them attractive: Their conversion process is clean, they may cogenerate useful heat, and can be used in many different fields. One worker in the field put it this way: “Fuel cells have.
