What about your problem when you used SnO2 ?

BDD electrode

You can find or buy BDD electrode from the following:

Windsor Scientific Ltd, 264 Argyll Avenue, Slough Trading Estate, Slough Berkshire, SL1 4HE, United Kingdom

NeoCoat SA  -  Eplatures-Grise 17, CH-2300 La Chaux-de-Fonds, Switzerland 

Firstly thank you for your cooperation

My problem with using SnO2 is increasing potential then potentiostat-galvanostat instrument stops. The potential augment until 5v maximum of instrument.

I'm too slow to cause this problem, so that's why I think to change the electrde.

  If you have an idea of the other working electrode

@ Ali Baddouh,

Can you explain it more clearly??? like how you have prepared sample (bulk or nano), what was your electrolyte? what was the potential window range??? etc...

Dear Sridhar Srinivasan

Firstly thank you for your cooperationMy problem with using SnO2 is increasing potential then potentiostat-galvanostat instrument stops. The potential augment until 5v maximum of instrument.

I used SnO2 Commercial

My Electrolyte is 2% NaCl

I'm too slow to cause this problem, so that's why I think to change the electrde.  If you have an idea of the other working electrode

Dear  Ali Baddouh,

You used commercial SnO2, Good. What was its micro-structural properties?? whether it is in the nanoparticle or any other structure (  if it so what was its average particle size??)... 

I hope these can help you sort out your problem... Try it out, if you are facing any problem during exp, feel free and ask...you are most welcome...

If you have no problem with using KOH, you can use 6M, which will have higher conductivity...

Thank you so much

before I used the same condition.

-NaCl supporting electrolyte.

-I increased the power until 120 mA.cm-2. from this I try  i have this problem.

For SnO2 electrode is a grid plate.

Can you help me to change my working electrode (SnO2) because my job is electrodegradation pollutants. I can change working electrode but i don't anyone 

Thanks 

Ali Baddouh, From your description it is quite difficult to understand what you are doing. As I see, you reach current 120 mA and then potential on the electrode increases. But really 120 mA is a very big current for electrodes. Probably it is impossible to achieve higher current, but potentiostat tries to do that by increasing potential more and more. In my opinion, you should not try to reach current higher than 120 mA.

Dear Ivan

For 120 mA i used it on time and after i have this problem

For me my work is electro degradation of Organics pollutants

I used three electrodes Pt, Reference and work electrode (SnO2)

Dear Ali Baddouh,

I would like to ask to you something. The question is, again, the same as what Ivan raised... Why did you want go up to 120mA?? and  You have mentioned you are passing current 120 mA/cm2, but what was your active materials mass???

Usually the specific capacitance is measured in both the ways, F/cm2 and F/g. Instead of passing current (per cm2) you canmeasure themass of your active material and pass current with respect to mass (per gram, let say, if your active materials mass be 1 mg then pass 1mA so that, the current density will be 1A/g). Even in this case you need not to go upto 120 A/g...

Dear Sridhar

For me I worked on electro-degradation of organic pollutants so I used stainless SnO2. And this plate of SnO2 it is not me who prepares it. I think you don't understand my subject 

Thank you