I made two electrode devices for the supercapacitor. I combined activated carbon and PVDF for negative electrodes in an 80:10:10 ratio. I combined active working material, PVDF, and activated carbon for the positive electrode in an 80:10:10 ratio. We used nickel foam as the substrate for both electrodes. We received the device's CV but need help getting the capacitance value using GCD. We obtained a low capacitance value compared to the working material in a three-electrode system. In a three-electrode system, we obtained 1350 F/g specific capacitance, whereas in a two-electrode system, we received just 25 f/g specific capacitance.
For the device, we used N-Methyl-2-pyrrolidone (NMP) to create a slurry solution of both negative and positive electrode materials. After the material has been deposited over the nickel foam, we heat it for 12 hours at 80 degrees Celsius. I've included an image of our devices; what should I do to figure out the capacitance value?
Shruti Deshpande The image you mentioned just depicts cables, not the two-electrode system you described, therefore I am unable to assess it.
Preparing electrodes correctly and ensuring proper assembly can improve performance.
Ranjith Balu
Hello, Sir. I used the following steps to prepare electrolytes:First, I dissolved 1g of PVA in 5 ml of distilled water and left it to stir overnight. The next day, I heated the above solution to 50 degrees Celsius for 5 hours. After that, I prepared 1g koh solution in 5 ml of distilled water and added it to the PVA solution, stirring for an additional hour. The solution forms a sticky gel, allowing me to bind negative and positive electrodes together using a separator. I used Wattman paper as the separator. The total area of mass loading is 1.5*2 cm. We prepare a liquid solution of material for deposition on the electrode.
Alvena Shahid Hello ma'am, I connected that wire to the negative and positive side of the electrode. Red is connected to the positive electrode(working material) and black is connected to the negative electrode (activated carbon).
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