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Abstract The current urgent desire of the renewable energy has imposed much challenge and inspiration for the design and development of the lead-free dielectric capacitors. High recoverable energy storage density… Click to show full abstract
Abstract The current urgent desire of the renewable energy has imposed much challenge and inspiration for the design and development of the lead-free dielectric capacitors. High recoverable energy storage density (Wrec) and efficiency (η) associated with long-time stability are highly demanded for the pulsed power systems. Here, we present a significantly enhanced energy storage performance in (Ce,Mn) hybrid doped (Na0.8K0.2)0.5Bi0.5TiO3–BiFeO3 [(Ce,Mn):NKBT-BFO] ceramic film capacitor deposited on indium tin oxide (ITO)/glass substrate. Meanwhile, the pure NKBT-BFO, Ce doped NKBT-BFO and Mn doped NKBT-BFO are studied for comparison. A large Wrec of 58.3 J/cm3 together with a high η of 58.1% is realized in (Ce,Mn):NKBT-BFO at 2200 kV/cm, which is proposed by the formation of a slim loop with a large difference between the remanent polarization (Pr) and maximum polarization (Pmax) at a high dielectric breakdown field strength. Moreover, the energy storage property is weakly dependent on time with small variations of Wrec (