Fe–Cu dual-doped MnO2 cathodes for high-performance Fe2+ ion hybrid capacitors

Key Points

• High-performance Fe–Cu dual-doped MnO2 cathodes significantly enhance energy storage capabilities.
• Fe2+ ions in the design improve electrode efficiency and longevity during cycling tests.
• Analysis presents the structural and electrochemical characteristics of the dual-doped MnO2 material.
• Implications support further exploration of dual-doped configurations for advanced energy systems.