Electrochemical Degradation Test of The catalyst for Polymer Electrolyte Fuel Cell (PEFC)



Electrochemical Degradation Test is one of key analytical methods to evaluate activity and durability of the catalyst for PEFC(Polymer Electrode Fuel Cell)
ANAC can provide customers with 3 types of Electrochemical Degradation Test.

  1. Electric Potential Cyclic Test:Deterioration of a catalyst can be accelerated in this test.
  2. Hydrodynamic Voltammetry(HDV):Activity for Oxygen reduction reaction can be evaluated.
  3. Cyclic Voltammetry(CV):Effective Surface area of Pt can be obtained.

The Schematic of Rotating Electrode Device used for Electrochemical Test

Cyclic Voltammetry(CV):Effective Surface area of Pt can be obtained.

Effective surface area of Pt is obtained from quantity of electricity QH.
‎Desorption amount ∝Pt surface area Pt surface area= QH (μC) / 210(μC/cm2)

Hydrodynamic Voltammetry (HDV)

(1) Reduction current is measured by changing the number of electrode rotation.

・It is known that 4 electrons reaction and 2 electrons reaction occur in the oxygen reduction process and 4 electrons reaction is preferable to a fuel cell due to its larger electric current.

(2)Activity index of a catalyst is obtained by Koutecky-Levich analysis.

  • Reaction electron number :n is obtained from the inclination of the straight line.
  • Activated current : Ik is obtained from the intercept of the line.

※Activated current can be the activity index of a catalyst.
(The larger current shows the better catalyst activity.)

Ik : Activated current
n : Reaction electron number
F : Faraday constant
A : Area of electrode (cm2)
c : Activity coefficient of reactant (mol/cm3)
D : Diffusion coefficient of reactant (cm2/sec)
ν : Coefficient of kinematic
viscosity in solution (cm2/sec)
ω : Rotation angular velocity (rad/sec)

Search Number 6G006

Download The Technical Note of This Exapmle.

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