LAUSR

Holey nanomaterials have been explored as superior electrode materials for energy storage devices. However, the existing methods for synthesis of holey materials are often too complicated and are limited mainly to graphene-derived holey 2D nanosheets. Herein, we report for the first time a versatile, efficient, and low-cost camphor carbon soot layer blasting approach for the generation of nanoholes in C@ZnFe2O4 nanoflakes without damaging the original nanoflake morphology. In the three-electrode system, the holey C@ZnFe2O4 nanoflake based electrode exhibits a high specific capacitance of 1452 F g–1 at 1 A g–1 and excellent cyclic stability with 96% of capacitance retention over 50 000 cycles in 6 M KOH electrolyte. In addition, a symmetric supercapacitor fabricated using two holey C@ZnFe2O4 nanoflake electrodes with [EMIM][BF4] electrolyte exhibits high capacitance (190 F g–1 at 1 A g–1), high energy density (81.4 Wh kg–1 at power density of 0.87 kW kg–1), and superlong cyclic stability (96% retention ove...