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

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Summary

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

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