
388 Fuel Cells
density willresult in small voltage changes. The voltage range of an MCFC
is typically 0.75 to 0.9 V and the current density ranges between 100 and
200mA/cm
2
. This requires several cells to be coupled in series to form a
stack to increase voltage to a practical value. Also, several stacks can be con-
nected in parallel and series to form a larger power system.
The hydrogen produced at the anode is the main component of the fuel for
the MCFC; however, it is evident that water and carbon dioxide are extremely
important in a working fuel cell. The water produced by the main anodic
reaction (Equation 9.18) drives the water–gas sh ...