In my labe we do not have two electrodes system. But when I measure cyclic stability test with three electrodes system, glass membrane in reference electrode corroded after 1000 or 1500.
Hello Md. Aftabuzzaman
Are you currently performing uni-polar or bi-polar experiments (i.e., is a postive window suitable --- is the system symmetric or asymmetric).
You should be able to simply 'short' the CE and RE connections of the potentiostat and polarise the WE w.r.t. the combined CE-RE terminal.
If you're using a source-measure unit (SMU) you can do this in the same way. Conventionally you would have the FORCE HI and SENSE HI connected to the WE, the FORCE LO to the CE and the SENSE LO to the RE.
See Jules's recommendation: you may always use a potentiostat as a 2 electrodes system by shorting RE and CE connections.
It looks strange to have a glass membrane in a reference electrode...give more details.
It could be that the reference electrode you are using is not suitable for your electrolyte. In general, cyclic stability upto 10000 cycles in a three electrode system is possible and has been reported in a number of journal articles.
If you choose to work, testing with the ("enforced 2-electrodes" mode) case, where you combine the CE-RE terminals, then it is recommended either to
1) disconnect your ("glass membrane") RE, or, try to
2) withdraw, if possible, your RE, out from the cell;
Otherwise, your RE might corrode[1] ... very soon.
1. If you ever combined CE-RE terminals with the RE, already, connected in the cell, then it is a, possible, reason for a very fast RE's corrosion.
Thank you everyone for giving your comments. Actually, I measure CV, GCD and EIS in a three electrodes system, where electrolyte is 6 M KOH and RE is Ag/AgCl. Yukun Zhu you are right it's glass frit at the end of RE. Jules Lloyd Hammond It's not coin cell, that's why I am not sure that I can say it symmetric or asymmetric. However, potential window is negative and it's 0 to -1. Ioannis Samaras according to your suggestion when I combine CE-RE, capacitance value is not same as three electrode system. I have added my system, please check it and let me know your opinion. Thanks again.
In the "enforced 2-electrodes" mode, make, only, one change: translate the alligator clip from the RE to the CE. Finally, you will have 2-alligators[1] on the CE, in the new photo case.
1. Finally, you will have 0-alligators on the RE. Now, the, externally unconnected, RE will be a quasi-free, floating, electrode in the cell. It will not corrode, very fast, now.
For a three electrode system in 6 M KOH, you can use calomel electrode as RE.
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