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Fuel cells are electrochemical devices that convert chemical energy into electrical energy with high efficiency and minimal environmental impact. They differ based on fuel used, operating temperature, and efficiency. Proton Exchange Membrane Fuel Cells (PEMFCs) operate at low temperatures (60–80°C), making them suitable for portable and automotive applications. They use hydrogen as fuel and oxygen from air as oxidant. PEMFCs have an efficiency of about ____ ______ _________ _______ ___.
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