Yes, and that will be said symmetric super capacitors.

Yes, you can[1-3], dear Nisal Geemal Vismith, if your are studying, mainly, the pseudocapacitive[4] properties of your electrode material(s).

1. Pseudocapacitive Energy Storage in Copper Oxide and Hydroxide Nanostructures Casted Over Nickel-Foam https://www.springerprofessional.de/en/pseudocapacitive-energy-storage-in-copper-oxide-and-hydroxide-na/18496096

2. Controlled synthesis, structural, morphological and electrochemical study of Cu(OH)2@Cu flexible thin film electrodes prepared via aqueous–non-aqueous routes https://www.springerprofessional.de/en/controlled-synthesis-structural-morphological-and-electrochemica/18956572

3. Hierarchically Porous CuO Microspheres and Their r-GO Based Nanohybrids for Electrochemical Supercapacitors Applications

https://www.sciencedirect.com/science/article/pii/S2238785420318354

4. Current progress achieved in novel materials for supercapacitor electrodes: Mini Review

https://www.researchgate.net/publication/334070014_Current_progress_achieved_in_novel_materials_for_supercapacitor_electrodes_Mini_Review

Yes you can use same material as both positive and negative electrode moreover coat the electrode material on the current collector with same weight

Achchhe Lal Sharma & Mohamed Ismail Thank you very much for your valuable clarifications.