Question

Ques 16.18)

Estimate the electrical conductivity values for the materials shown in the table.Show appropriate units for conductivity.Which of these materials will serve as effective electrode material in Microfuel cell applications?Why?

MaterialResistivity (-cm) Conductivity

Carbon paper 80 x10^-3

Carbon cloth11 x10^-3

Carbon foam 10 x10^-3

RVC 5 x10^-3

Graphite rods 0.9 x10^-3

Graphite sheets 250 x10^-3

Graphite felt 0.18

Answer 1

Conductivity = 1/ resistivity (inverse of resistivity)

Material Resistivity (ohm-cm) Conductivity

Carbon paper 80 x10^-3 12.5 ohm^-1 - cm^-1

Carbon cloth 11 x10^-3 90.9 ohm^-1 - cm^-1

Carbon foam 10 x10^-3 100 ohm^-1 - cm^-1

RVC 5 x10^-3 200 ohm^-1 - cm^-1

Graphite rods 0.9 x10^-3 1111  ohm^-1 - cm^-1

Graphite sheets 250 x10^-3 4 ohm^-1 - cm^-1

Graphite felt 0.18 5.6 ohm^-1 - cm^-1

deal electrode materials should be of good conductivity, so graphite rods will be better as microfuel electrodes