Week 2 Challenge

Question 1:
Compare four different types of fuel cells and state their applications :-

Types of Fuel Cells :

1. Ploymer Elctrolyte Membrane Fuel Cell (PEMFC)
2. Alkaline Fuel Cell (AFC)
3. Direct Methanol Fuel Cell (DMFC)
4. Solid Oxide Fuel Cell (SOFC)

Prameter	PEMFC	AFC	DMFC	SOFC
Power (KW)	0.01 - 250	0.1 - 50	0.001 - 100	0.5 - 2000
Efficiency	40 - 55 %	55 - 70 %	40 %	40 - 72 %
Operating Temperature (°C)	60 - 110	70 - 130	70 - 130	500 - 1000
Type of Electrolyte	Proton conducting ploymer membrane	Aqueous Potsssium Hydroxide	Nafion	Ceramic Eelctrolyte
Fuel	Hydrogen	Hydrogen	Methanol	Hydrogen
Byproducts	Heat & water	Water	Water & Co2	Water
Reactions	At anode: At cathode: Overall reaction :	At anode: At cathode: Overall reaction:	At anode: At cathode: Overall reaction:	At anode: At cathod: Overall reaction:

Applications :

# Ploymer Electrolyte Membrane Fuel Cell (PEMFC):-

• Backup power
• Portable power
• Distributed generation
• Transportation
• Specialty vehicle

# Alkaline Fuel Cell (AFC):-

• Military
• Space
• Backup power
• Transportation

# Direct Methanol Fuel Cell (DFC) :-

• Auxiliary power
• Electric utility
• Distributed generation

# Solid Oxide Fuel Cell (SOFC) :-

• Portable fuel cell applications such as cell phones or laptop computers

Question 2:
Using a plot with energy density and power density on the X and Y axis, arrange various battery types like lithium ion, lead acid, Nickel Cadmium, Ultracapacitor, fuel cell:-

Below Graph is the basic Energy density & Power density of different types of energy storage devices like Capacitors & Batteries ( Li-Ion , Lead-Acid , Nickel-Cadmium etc. ) & Fuel Cells :

In Energy density :

Super capacitors < Batteries < Fuel cells

Super capacitors are having the Lowest Energy dencity and Fuel cell having the Highest Energy density and Batteries are in between the Super capaciters and Fuel cells

In Power density :

Super capaciters > Batteries > Fuel cells

Super capacitors are having the Highest Power dencity and Fuel cell having the Lowest Power density and Batteries are in between the Super capaciters and Fuel cells

Comparing Only Batteries :

Energy Density :

Lead-acid < Nickel Cadmium < Lithium ion

Lead- acid has the lowest energy density and Lithum ions has the Highest Energy dencity and the Nickel Cadmium is in between the Lead acid and Lithium ion

Power Density :

Lead-acid < Nickel Cadmium < Lithium ion

Lead- acid has the Lowest Power density and Lithum ions has the Highest Power dencity and the Nickel Cadmium is in between the Lead acid and Lithium-Ion.

By combining the Both the graphs we can conclude that

In Energy density :

Super capacitors < Lead-acid < Nickel Cadmium < Lithium ion < Fuel cells

In power density:

Fuel cells < Lead-acid < Nickel Cadmium < Lithium ion < Super capaciters