Is it possible that for a reported supercapacitor material the potential window in charge discharge comes out to be entirely different?

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Kindly shed some light on it. In my case, the rGO alone is providing better supercapacitor properties than composite.

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Mohit Saraf

I m working on metal oxide graphene composite for super capacitors using Ag/AgCl as reference and modified glassy carbon electrode as working. At a particular current density my charge discharge graph starts from 0.1 or 0.2V and goes up to 0.6V, But for the same material prepared by same method, reported potential window is -0.1 to -0.9. Is that possible?