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In recent decades，the application of fuel cells in vehicles has been the focus of increased attention.In contrast to a chemical battery，a fuel cell generates electric energy rather than storing it and continues to do so as long as a fuel supply is maintained.Compared with the battery-powered EVs，the fuel-cell-powered vehicles have the advantages of a longer driving range without a long battery charging time.Compared with the ICE vehicles，they have the advantages of high energy efficiency and much lower emissions due to the direct conversion of free energy in the fuel into electric energy，without undergoing combustion.