which are the correct values about diffusion coefficient of O2 (Do), Kinematic viscosity and bulk concentration of O2 (Co) for the Koutecky-Levich plot in 1M KOH? For example
Do = 1.93 × 10-5 cm2 s-1, Co = 1.26 × 10-6mol cm-3 v=0.93 × 10-2cm2s-1(Electrochimica Acta,Effect of CO2, HCO3and CO3−2on oxygen reduction in anion exchangemembrane fuel cells,doi:10.1016/j.electacta.2009.10.041 )
Do = 1.65× 10-5 cm2 s-1, Co = 0.83 × 10-6mol cm-3 v=0.95 × 10-2cm2s-1
(Electrocatalytic Activity of Non-Stoichiometric Perovskites toward Oxygen
Reduction Reaction in Alkaline Electrolytes, doi 10.1149/1.3655433 )
Do = 1.9× 10-5 cm2 s-1, Co = 1.2 × 10-6mol cm-3 v=1.0× 10-2cm2s-
(Nanoscale,Hydrothermal synthesis of vanadium nitride and
modulation of its catalytic performance for oxygen
reduction reaction,DOI: 10.1039/c4nr02646b)
Dear Zai,
in my opinion those values are very similar. Differences can be due to different sensitivities of setups or even different fitting parameters or taking into account different number of valid digits in obtained results (see e.g. Co = 1.2 vs. 1.26).
What I would do is calculate what I have to using different values and present results with appropriate references (e.g. the result is X for Do values from ref.Y etc.).
Good luck :)
Dear Marta Siek, Thanks for your answer, i understood. You mean that we can select the proper value in a reasonable way to apply to caculate the transfer electron number from K-L equation.
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