How can one perform time limited OCP (open circuit potential) measurement in Autolab Nova 1.10 ?

Hello,

I have received a number of 0.0033781 = CPE 1-T from ZVIEW software, which is very different from the capacitance obtained from cyclic voltammetry (about 1300 F/g). Should this number be converted to units?

I currently performed an EIS analysis but could not get a semicircle in the Nyquist plot. The material being tested in 1.5% NaCl is aluminum matrix composite (AMC) reinforced with SiC particles and coated with ZrO2 thin film by ALD. In other words, ZrO2 was deposited on AMC as a protection layer against corrosion. The frequency region was set from 100000 to 0.01 Hz. Does the result show poor coating? I wonder how I should interpret the result and what to do next.

I am trying to perform galvanostatic charge and discharge cycles in an organic-based battery with a PGTSTAT128N. In the first cycle, the charging occurs well but the discharge doesn't. I am using the working and sensing banana plugs short-circuited and attached to the battery's cathode and the reference and counter electrode banana plugs short-circuited and attached to the battery's anode. Am I using the correct set-up? Could anyone help me with this?

Unfortunately, I have no access to a battery cycler and I need to use the AutoLab potentiostat.

The EIS in supercapacitor is generally conducted at OCP (open circuit potential). However, in pseudocapacitive material if the region of interest (potential at which anodic or cathodic reaction takes place) is different then why not conduct EIS at that potential.

If done what could be the implications?

Dear All,

I want to calculate the electrochemical impedance of electrolyte-electrocatalyst interphase using Autolab. I am confused how to select the overpotential or potential vs Ag/AgCl. In a paper researchers selected fixed value of 270 mV for 5 different catalysts. I am working on 6-7 materials how to chose potential value what is the purpose of it?? I should be at onset of Faradaic process or something else??? It should be same for all catalysts???

Second, How to calculate impedance of electrolyte. Do i need to perform the same experiment (mentioned above) without catalyst coating or something else??

I have purchased Thales Zahner EIS software which works only with the electrochemical station. I need a standalone powerful software for this purpose which can import data and then help me to get the graphs. Is there any free Electrochemical Impedance Spectroscopy modelling software available? 

Hello

I've read in many papers and books that in order to calculate the capacitance of a material one has to calculate the area under the discharge curve of the cyclic voltamogram. However it does not make sense to me because most of the area of my voltamograms is beneath the Y axis.

I wonder if the books refer to the area locked between the charge and the discharge curve, as is depicted in orange in the attached image.

Thank you

1. During charging Li ion moves from cathode to anode means lithium ion will go inside the anode structure. But if we are already using Lithium metal as a anode then where lithium ion from cathode will go during charging? 

2. and why we always check electrode material whether cathode or anode with respect to lithium metal as reference electrode?