Fuel Cells and Fuel Cell Systems ME 1065 L. Schaefer.

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Presentation transcript:

Fuel Cells and Fuel Cell Systems ME 1065 L. Schaefer

Proton Exchange Membrane Cathode: ½O e H + => H 2 O Anode: H 2 => 2 H e - Overall: H 2 + 1/2 O 2 => H 2 O

Problems with PEMs/PEFCs Hydrogen Tank Rupture

Direct Methanol Cathode: 3/2 O 2 + 6e - + 6H + => 3 H 2 O Anode: CH 3 OH + H 2 O => 6H + + CO 2 + 6e - Overall: CH 3 OH + 3/2 O 2 => 2 H 2 O

DMFCs, cont.

Alkaline Cathode: 1/2 O 2 + H 2 O + 2e - => 2 OH - Anode: H 2 + 2(OH) - => 2H 2 O + 2 e - Overall: H 2 + 1/2 O 2 => H 2 O

AFCs, cont.

Phosphoric Acid Cathode: ½ O H e - => H 2 O Anode: H 2 => 2H + + 2e - Overall: H 2 + 1/2 O 2 => H 2 O

Molten Carbonate Cathode: 1/2 O 2 + CO e - => (CO 3 ) = Anode: H 2 + (CO 3 ) = => H 2 O + CO e - Overall: H 2 + 1/2 O 2 + CO 2 => H 2 O + CO 2

MCFCs, cont.

Solid Oxide Cathode: 1/2 O e - => O = Anode: H 2 + O = => H 2 O + 2 e - Overall: H 2 + 1/2 O 2 => H 2 O

SOFCs, cont.

Basic Summary of Four Types

Fuel Cell Summary

Fuel Cell Governing Equations Heat/Mass Transfer Electrochemical Electrical Network

Governing Equations Heat and Mass Transfer Model Continuity, Momentum, Energy, Concentration

Governing Equations Heat and Mass Transfer Model, cont. Continuity, Momentum, Energy, Concentration

Hydrogen Fuel Cell Values Form of Water Product Temp (°C)Gibbs Free Energy of Formation (kJ/mol) Max EMF (V) Efficiency Limit (%) Liquid Liquid Gas Gas Gas Gas Gas Gas

Performance Curves

Fuel Cell Buses

Hybrid Power

Cogeneration and Cascading Energy Systems PV SOFC Turbine Chiller Boiler Electricity Chilled Water Hot Water

Unexpected Places!

Figure for Example Problem

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