| http://www.w3.org/ns/prov#value | - O2+4e??????2O2??? At the anode, the oxide ions react with a fuel, such as hydrogen, carbon monoxide, methane, other hydrocarbons, or a combination comprising at least one of the foregoing fuels, which is introduced to the electrochemical cell 10 as illustrated by the fuel flow arrows 62, 62???, 62???.
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