Abstract
Mer a short historical survey, the principles of fuel cells are discussed, underlining electrocatalytic problems to be overcome to increase their energy efficiency, and power density. The different kinds of fuel cells are then presented, with their advantages and dissdvantages, and their possible uses, particularly as power sources for electric vehicles. Different means of fuel and hydrogen storage are also discussed. Finally the two types of fuel cells, which appear the best candidates for an electric vehicle, are presented in details, i.e. the.H2/air Proton Exchange Membrane Fuel Cell, and the Direct Methanouair Fuel Cell.

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