Similar to a battery, a fuel cell provides stored energy. A proton-exchange membrane fuel cell (PEMFC) gets its energy from the chemical reaction of stored hydrogen and oxygen from the air. These gases combine inside the fuel cell to provide electrical power while emitting only water without carbon dioxide, making this fuel cell environmentally friendly. The PEMFC technology holds great promise as a clean alternative to the internal combustion engine of cars, which emits greenhouse gases and pollutants.
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