Fig. 1: Energy storage performance of BSCNTx ceramics.

a Unipolar P-E loops under maximum electric field of BSCNTx ceramics. b Energy density and efficiency, calculated based on the P-E loops of BSCNTx ceramics at the maximum electric field, presented as a function of conformational entropy. c Comparison of Eb, ΔSconfig, and energy storage performance of BSCNTx ceramics. d Comparison of the energy storage performance (Wrec and η) of the BSCNT0.30 ceramics with other representative lead-free ceramics and TTBs ceramics reported previously.