Science and Technology of Ceramic Fuel Cells by Minh N.Q., Takahashi T.

By Minh N.Q., Takahashi T.

Ceramic gasoline cells, generally called good oxide gasoline cells (SOFCs), were lower than improvement for a vast diversity of electrical strength iteration purposes. the main appealing characteristic of the SOFC is its fresh and effective creation of electrical energy from various fuels. The SOFC has the capability to be synthetic and operated cost-effectively. The widening curiosity during this expertise, hence, arises from the ongoing have to advance cleanser and extra effective technique of changing power resources into important forms.This topical booklet presents a complete treatise on good oxide gas cells and succeeds effectively in filling the space out there for a reference publication during this box. Directed in the direction of scientists, engineers, and technical managers operating with SOFCs in addition to ceramic units in line with accomplishing fabrics, and in similar fields, the e-book may also be necessary as a textbook for technology and engineering classes.

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14) where AG Ois the standard Gibbs free energy change of the combustion reaction of the fuel, AH ~ the standard enthalpy change, AS~ the standard entropy change, and z the number of moles of oxygen required to oxidize one mole of fuel multiplied by four. 1 lists AG ~ A//~ E ~ and eT for the combustion of several fuels (when the fuel cell reaction products are in gaseous state). 00 ~, kJ The effect of temperature and pressure on the reversible voltage of a fuel cell can be analyzed based on changes in the free energy with temperature and pressure.

46) 12 From these equations, the total power, Pw~o), is Pw(o) = Pw(o + Pw(~) + Pw = E(j + j~) (Eq. 47) The energy efficiency, e, of the cell is the ratio of power output to total power e - P w Pw(o) (Eq. 48) Then, the relation between energy efficiency and current output is expressed by the following equation: oEti j _ j2 e = (Eq. 4 shows the relation between e and j, for constants E and o, with ti as a parameter. 4. 3] 32 Chapter 2 a mixed-conducting electrolyte is lower than that of the cell with a purely ionic conductor in the whole range of current output (for a constant value of total conductivity).

Therefore, the conductivity for a doped MO2 under this condition is given by the following equation: o = o n = entx n = p-116 e(2K)-l/31xn 02 (Eq. 33) At intermediate oxygen partial pressures, the total electrical conductivity can be approximated as _ p-114 o = 2e[Vol . tpp1/42 (Eq. 34) where the electroneutrality condition is 2tVol- 03 ,1 (Eq. tp (Eq. 36) Since the mobility of oxygen-ion vacancy is generally much lower than that of electrons or electron holes, MO2 doped with a trivalent metal oxide can only exhibit an appreciable ionic conductivity over a wide range of oxygen partial pressures when the concentration of oxygen-ion vacancy is considerably larger than n and p.

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