Synergistic Multioxide Nanoheterostructures for High‐Performance Supercapacitors

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Advancing multifunctional electrode materials is crucial for next‐generation energy technologies. In this work, SnO 2 /ZnO/CdO nanocomposites were engineered to synergistically enhance charge transfer and electrochemical performance for efficient energy storage, which was evaluated through supercapacitor studies. Structural analysis confirmed the tetragonal rutile phase of SnO 2 , the hexagonal phase of ZnO and the face‐centered cubic structure of CdO. Energy‐dispersive X‐ray spectroscopy verified elemental composition, while optical and Raman analyses revealed size and surface defect characteristics. Electrochemical measurements through cyclic voltammetry and galvanostatic charge–discharge exhibited a high specific capacitance of 556.81 F g −1 , reflecting superior charge storage behavior. It was inferred that ZnO improved electronic conductivity, CdO increased carrier density and ion mobility inside the electrode, while SnO 2 offered structural stability and high theoretical capacity.