Fuel cells convert the chemical energy of fuels directly to electricity . Hydrogen is not combusted instead fuel cells convert hydrogen and oxygen into water and electricity . This process is not bound by the law of thermodynamics which makes fuels cells capable of attaining up to 80 efficiency . Hydrogen can be stored in liquid , gas or metal hydride form . Also hydrogen can come from the reforming of hydrocarbon fuels like methanol and ethanol . The main by product is water . The main...











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