Electrochemical performance and structural evolution of spray pyrolyzed Mn₃O₄ thin films in different aqueous electrolytes: effect of anions and cations.

1–4 Compared to other frontrunners in the field, such as conventional capacitors and batteries, supercapacitors cover a large area on the Ragone plot, making them highly significant in the research community. 5 From the viewpoint of storage mechanism, SCs are classified as electric double-layer capacitors (EDLCs), pseudocapacitors (PCs), and hybrid capacitors. 6 In EDLCs, storage is achieved through the electrostatic attraction of electrolyte ions on the electrode surface, which is a non-faradaic process.

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