Remarkable capacitive performance in novel tungsten bronze ceramics

摘要

In this study, novel lead-free Sr1.75Ca0.25NaNb5O15 tungsten bronze ceramics were designed for potential energy storage applications. A remarkable energy storage density (similar to 3.23 J cm(-3)) along with a high energy storage efficiency (similar to 88.2%) was obtained simultaneously at an applied electric field of 290 kV cm(-1). Moreover, the ceramic also showed exceptional discharging performance including a fast discharge rate (tau(0.9) < 70 ns), an ultrahigh discharge current density (1104 A cm(-2)) and a high power density (82.8 MW cm(-3)). The achieved capacitive performance in this work indicates the great potential of the designed novel tungsten bronze ceramic for energy storage applications.