MCFC Flashcards
What are the features of high temp. FCs?
• Better efficiency
• No noble metals necessary (good electro-catalysis due to high temperatures)
• Systems technology simpler
• Systems components more expensive
• Materials‘ problems increase (ceramics, nickel-base alloys, special steels, etc.) • Thermal cycling limited
• High-grade heat, e.g., for steam generation
MCFC Advantages.
• Air on the cathode side possible
• CO possible as fuel gas
• Further increased tolerance to impurities in the fuel gas • High system efficiency
• Direct reforming in the stack possible
• Favorable waste heat level
MCFC Disadvantages.
• Low current or power density (<150mA /cm2)
• Long-term stability problematic (electrolyte losses, corrosion)
• CO2 required on the cathode side
• Operation with pure hydrogen only conditionally possible
Anode material in MCFC.
Ni + 10m% Cr
Cathode material in MCFC.
Li_x Ni_1-x O
Elektrolytmatrix in MCFC.
g-LiAlO2
Elektrolyt in MCFC.
Li_0,62 K_0,38 CO3
Li_0,5 Na_0,5 CO3
Li_0,5 K_0,5 CO3
Where can MCFC be applied?
Advantages of the molten carbonate cell lie in its high working temperature, which enables the direct conversion of carbon monoxide as fuel gas in the large cell area and the comparatively simple process technology. Because of these properties, the molten carbonate cell is particularly suitable for stationary use and is optimized for natural gas and biomass.
What is the pore size in the membrane matrix in comparison to electrodes?
They are smaller than the ones in the electrodes.
IC material in MCFC.
Stainless steel but with nickel on anode side.
What is the cathode reaction in MCFC?
CO2 + 1/2O2 + 2e- → CO3-
What is the Anode reaction in MCFC?
H2 + CO3- → H2O + CO2 + 2e-
What is the reaction in the internal reformer in MCFC?
CH4 + 2H2O → CO2 + 4H2
