we can use EIS for for determining Rct for characterizing for modified electrodes????
from EIS how can find phase angle from EIS data
May also help you:Electrooxidation of borohydride on platinum and gold electrodes: Implications for direct borohydride fuel cell” by E. Gyenge, Electrochim. Acta 49 (2004) 965
i am trying to fit impedance data using Z view software
i am getting Z' and Z'' values and also theta
from that how can i find the phase angle
is there any formula????
pls explain in simple way
I HAD 100 POINTS IN THAT DATA
AT WHICH POINT I WANT TO TAKE THE THETA VALUE
FOR EXAMPLE AT 50????
No body can answer that Mr Rangasamy. In EIS you do not have a 'theta value'. There are 'theta values'. If you say 100 data points, then you have 100 theta values. For each data point (Nyquist plot) the phase angle is just the angle between the vector linking the said data point to the origin and the x- or real axis. If you did not get phase angles (theta values) directly from your measurements, then do as said by Mr Christian Punckt or Mr Roto Roto. Then, from your Bode plot you can get important parameters like solution resistance, charge transfer resistance and double layer capacitance. (I still think that the two articles proposed to you earlier will be of great help and maybe some more literature review. Please read the chapter on EIS In ELECTROCHEMISTRY :PRINCILPLES, METHODS AND APPLICATIONS by Christopher Brett and A. M. Oliveira Brett 1993)
I have a little problem. In one of your posts you wrote 'i am trying to fit impedance data using Z view software i am getting Z' and Z'' values and also theta
Which electrochemical system are you using? If you are using CH instruments then text file of EIS data gives you frequency dependent four columns data such as Z', z'', Z, and phase angle. In the Nyquist plot ( z' vs Z'') you will get semicircle followed by a straight line. The right intercept of the semicircle to the Z' axis gives you the charge transfer resistance of your electrode. Hope this information is sufficient for you. good luck of your research.
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