CHEG 295/320 (Fuel Cell Engineering, Fall 2004)

(C) Vijay Ramani and J. M. Fenton (2004)

Classification of Fuel Cells

Images in Slides 3-6 reproduced from:

http://fuelcells.si.edu/ : The Smithsonian Institute

CHEG 295/320 (Fuel Cell Engineering, Fall 2004)

(C) Vijay Ramani and J. M. Fenton (2004)

1000° CYttria Stabilized ZirconiaSolid Oxide

650° CLithium / Potassium Carbonate

Molten Carbonate

160 – 200° CPhosphoric AcidPhosphoric Acid

70-120° CPotassium HydroxideAlkaline

60-80° CPolymer membranePolymer Electrolyte

Operating TemperatureElectrolyte UsedFuel Cell Type

CHEG 295/320 (Fuel Cell Engineering, Fall 2004)

(C) Vijay Ramani and J. M. Fenton (2004)

2H2 = 4H+ + 4e

Pt electrodes usedPt electrodes used

HH33POPO44 or Acidic polymer electrolyteor Acidic polymer electrolyte O2 + 4H+ + 4e = 2H2O

CHEG 295/320 (Fuel Cell Engineering, Fall 2004)

(C) Vijay Ramani and J. M. Fenton (2004)

2H2 + 4OH- = 4H2O + 4e Ni, Au, Ag based Ni, Au, Ag based electrodeselectrodes

O2 + 2H2O + 4e = 4 OH-80 80 –– 85% KOH electrolyte85% KOH electrolyte

CHEG 295/320 (Fuel Cell Engineering, Fall 2004)

(C) Vijay Ramani and J. M. Fenton (2004)

LithiatedLithiated Nickel oxide Cathode; Nickel oxide Cathode;

Nickel + Chromium (10%) anodeNickel + Chromium (10%) anode

Li, Na and K Carbonate based Li, Na and K Carbonate based electrolyte (50 wt%) electrolyte (50 wt%) –– molten statemolten state

H2 + CO32- = H2O + CO2 + 2e

0.5 O2 + CO2 + 2e = CO32-

CHEG 295/320 (Fuel Cell Engineering, Fall 2004)

(C) Vijay Ramani and J. M. Fenton (2004)

H2 + O2- = H2O + 2e

YttriaYttria Stabilized Zirconia Stabilized Zirconia ElectrolyteElectrolyte

Strontium doped Lanthanum Strontium doped Lanthanum ManganiteManganite as Cathodeas Cathode

Nickel Zirconia as anodeNickel Zirconia as anode

0.5O2 + 2e = O2-

CHEG 295/320 (Fuel Cell Engineering, Fall 2004)

(C) Vijay Ramani and J. M. Fenton (2004)

00 20002000

CHEG 295/320 (Fuel Cell Engineering, Fall 2004)

(C) Vijay Ramani and J. M. Fenton (2004)

CHEG 295/320 (Fuel Cell Engineering, Fall 2004)

(C) Vijay Ramani and J. M. Fenton (2004)