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• 0.80NN-0.20BNH ceramic achieved large W rec of 6.45 J/cm3 and an η of 82.72 %. • 0.8NN-0.2BNH ceramics displayed high power density (P D = 215 MW/cm3). • 0.8NN-0.2BNH ceramics displayed large current density (C D = 1346 A/cm2). • 0.8NN-0.2BNH ceramics show excellent stability of frequency and temperature. (1- x)NaNbO 3 - x Bi(Ni 0.5 Hf 0.5)O 3 [(1- x)NN- x BNH, x = 0.10, 0.15, 0.20 and 0.25] lead-free ferroelectric ceramics were fabricated via a standard solid-phase reaction method, in order to obtain superior energy storage properties. BNH is introduced into the NN lattice to limit grain growth and improve the breakdown field strength as a second component. As the results indicate, a high W rec of 6.45 J/cm3 and a breakdown field strength (E b) of 380 kV/cm were achieved for the 0.80NN-0.20BNH ceramic, which was dependent on the nonequivalent replacement at the B site. In addition, the ceramics maintain significant stability over a frequency range of 10 Hz to 1000 Hz and temperature intervals from 30 up to 120 °C. Exceptional charge/discharge properties of high power density (P D = 215 MW/cm3) and current density (C D = 1346 A/cm2) along with an ultra-fast discharge rate (54 ns) were acquired. These results demonstrate that the 0.80NN-0.20BNH ceramic is an energy storage material with high potential. [ABSTRACT FROM AUTHOR]