Microporous Ni11(HPO3)8(OH)6 nanocrystals for high-performance flexible asymmetric all solid-state supercapacitors

Abstract

Microporous nickel phosphite [Ni₁₁(HPO₃)₈(OH)₆] nanocrystals were prepared using a hydrothermal method, and were successfully applied as a positive electrode in a flexible all solid-state asymmetric supercapacitor. Because of the specific micro/nanostructure, the flexible solid-state asymmetric supercapacitor can achieve a maximum energy density of 0.45 mW h cm⁻³, which is higher than most reported supercapacitors. More importantly, the device performance remains efficient for 10 000 cycles.