Functional Materials and Advanced Manufacturing



98 Functional and Smart Materials

Another advanced model depicting ionic transport is the Vogel Tammann Fulcher

(VTF) model, based on free volume theory, accounts for more accurate representa-

tion of the segmental motion of the polymer electrolytes, through Equation 5.2:

A

σ

= e (5.2)

√T

where A,  andT are same as Equation 5.1, B refers to the pseudo-activation energy,

whileT

0

is equilibrium glass-transition temperature, where T

0

is roughly 50 K lower

than T

g

[82].

5.7 ENERGY HARVESTERS AND RENEWABLE TECHNOLOGIES

An energy harvester can be dened as a system that produces energy from its sur-

rounding without consum ...