
Keywords: PEMFC; Proton Exchange Membrane Fuel Cells; AFC,; Alkaline Fuel Cells; PAFC; Phosphoric Acid Fuel Cells; MCFC; Molten Carbonate Fuel Cells; SOFC; Solid Oxide Fuel Cells; DMFC; Direct Methanol Fuel Cells; DFAFC; Direct Formic Acid Fuel Cells; MFC; Microbia