| RE:Hydrogen again |
Subject: RE:Hydrogen again by Slalom4me on 2008/2/12 17:24:09 Quote: Gasoline powered cars also produce water and in the right weather conditions I believe it is a matter of the proportion of water given off by the different processes. In a fuel cell, electricity is generated by passing hydrogen through the anodic side of a polymer electrolyte membrane (PEM). Oxygen is passed through the cathodic side. H ions are stripped off through an electrolyte between the anode/cathode. By-products of this chemical reaction are heat and water. How much water? "Combining a mole of hydrogen gas and a half-mole of oxygen gas from their normal diatomic forms produces a mole of water." From the above, it seems to me that a vehicle powered by a fuel cell will expel a quantity of water that is equal to the quantity of hydrogen consumed. At this time, I do not have a sense of the volume of water that would be produced to move a 2,400 lb fuel cell vehicle at 30 MPH. However, my vote is that it would be greater than the volume of water produced by a gasoline-powered internal combustion engine under the same conditions. FWIW. If I understand correctly, a stationary fuel cell manufactured by Toshiba for residential use expels 52.8 US gal (200 L) of water in the process of generating 700 W of electricity. . |
