It's ok. Nothing wrong is there.But you have to control the pressure. Generally it should be 10Mp for 10-15second. Then dry the pressed electrode at 60 degree in hot air or vacuum oven. After proper drying use the electrode for measurement.If you have any doubt, you may freely interact with me.

It's all good. You can also use a thin sheet of aluminum.

Pre-use carbon coating on the surface. It is necessary to use the Spray gun for this.

Drying. Two stage. 1)Preheat oven at 60 - 80 degrees Celsius - 2 hour.

2)The final drying. Please use vacuum oven overnight. It is very important resistance of the material. It should be less than 2 Ohm.

The electrolyte solution should be considered, if using H2SO4 or other acidic electrolyte solution, nickel foam may be corroded.

Thank you, everyone.

I will try to experiment along your comment.

In addition to using only an alkaline electrolyte as mentioned by Zhao, the use of a nickel foam for studying capacitive materials may bring about another issue: Its contribution to the charging/discharging currents and hence the final value of electrode capacitance derived.

There are two mechanisms for the nickel foam electrode to contribute to the overall capacitance of the electrode: the double layer capacitance of the high surface area of the nickel foam, and the redox chemistry of the oxide (or hydroxide) layer on the nickel surface in the alkaline electrolyte. Without subtraction of these contributions, the calculated electrode capacitance, particularly when it is divided by the mass of the loaded active material to obtain the specific capacitance, can be highly overestimated.  

Dear George zheng chen

Thanks for reply.

Then , when i calculate capacitance, The nickel foam capacitance in the total capacitance going to remove?

@Sangchul Byun, Yes, you should subtract the capacitance of the Ni foam alone from the total capacitance of the Ni foam + active material loaded.

@Sangchul Byung >> Yes, I totally agree with Mr Chen, 

You can get the capacitance of Ni foam by simply measuring Ni foam alone (without adding your sample on it). --1

Again, measure the Ni foam+active material loaded.--2

Then subtract 2-1 

Ni foam should be the same mass in both experiment. 

thank you, casey kzin

I want to buy very thin Ni Foam for my research work.Kindly give me the Supplier information........

It is Ok, no problem, Ni Foam is suitable for aqueous electrolytes, but in acidic it may corroded. 

I really appreciate the responses given ... I have equally learnt from it.

But I would like to ask which current collector will be the best for a supercapacitor electrode made of PANI composite. What is the best possible electrolyte to be used alongside?