Hi,
I found most papers used ferricyanide as the redox probes in electrochemical measurement like electrochemical impedance spectroscopy and cyclic voltammetry, while only a few used rutehium hexaammine; are there any particular reasons for that? Is it because rutehium hexaammine is more expensive? Also, for the concentration of ferricyanide as the redox probes, most used 1mM or 5mM, does the concentration really affect the electrochemical measurement?
Thanks,
Dan
availability - cost - well proven - before these complexes are known- conventional redox system use in titration -easy complexing
I agree with Christian Punckt. I would add that the process of rhe Fe(CN)63-/Fe(CN)64-/ is a typical negatively charged inner-spher reaction, whereas Ru(NH3)63+/Ru(NH3)62+ is a typical positively charged outer-sphere reaction.
To view the importance of the previous comment you can see Du et al. in Electrochimica Acta 52 (2007) 6534–6547 and Liu et al. in Sensors and Actuators B 157 (2011) 189– 194
Due to the fact that is very stable and the redox process is higly reversible.
Dear Dan Wu,
take a look at the attached review article of McCreery, which is already mentioned by the other scientists. Pay attention to the highlighted text.
Good luck
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