transition metal such as Mn, Ni, Co, Cu etc are more likely used as positive electrode
whereas some others such as Bi, Fe, Mo, Carbon etc are more likely used as negative electrode materials.
Until high school course, element was known to lose its properties as it forms compound. Maybe it is wrong in reality.
What makes that element have certain potential window for capacitance no matter what element they are combined with?
What determines the potential window?
Band gab energy of different component is one issue. Conduction and valence bands electrons population and recombination phenomena can lead to a certain window for different elements.
Dear Seongwoo,
The band gap of the electrolyte determines the electrochemical window. The band gap of an electrolyte is very often determined by the highest occupied molecular orbital (HOMO) to the lowest unoccupied molecular orbital (LUMO). The selections of anode and cathode are according to HOMO and LUMO energy levels to realise the supercapacitor system.
Best wishes
Xuhua
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