Membraneless micro fuel cell

 
 Geometrical design for membraneless micro fuel cell with H shape

 

This design consists of anode, cathode and small passage channel.

Anode and cathode fluid are mixed in small passage

This design has better provisions to decrease mixing region and to increase electrode area

area than the conventional micro fuel cells.

 

 

 

 

 

 

 Fuel crossover in H shape

 

Fuel crossover means that how much fuel reaches cathode electrode. If fuel crossover increases, overvoltage increases. Then fuel cell voltage decrease. So, to decrease fuel crossover is important in fuel cell.

 

 

 

 

 

 Geometrical design for membraneless micro fuel cell with trident shape

 

This design consists of anode, cathode and proton conducting fluid inlet channel.

Anode and cathode fluid are interconnected with proton conducting fluid channel.

Anode fluid and proton conducting fluid channel are interconnected by small narrow passage. Cathode fluid and proton conducting fluid channel are interconnected by small narrow passage.

This design has better provisions to increase the electrode area than the conventional micro fuel cells.

 

 

 

 

 

 

 Parametric study for trident shape membraneless micro fuel cell with improved fuel utilizations

 

Fuel utilization is defined as the ratio of the reacted fuel in the cell to fuel introduced in the cell.

Fuel utilization is much improved for d/h<1 (where d is anode or cathode channel height and h is proton conducting fluid channel height).

Maximum fuel utilization is obtained around 52% for set 1 where the width of the narrow passage is 50 micron.

 

 

 

 

 

 

 Validation of the model

 

Fuel utilization is gradually decreased with increasing inlet velocities.

Present trident shape geometry has much higher fuel utilization than conventional geometry for membraneless micro fuel cell.

 

 

 

 

 Further improvement of fuel utilization

 

Increased channel length can be useful to increase the fuel utilization.

Present geometrical design has better provisions to increase the reaction surface area.

Maximum fuel utilization has obtained for 25mm channel length is about 86%.