NiCo-Se nanoparticles encapsulated N-doped CNTs derived from prussian blue analogues for high performance supercapacitors

Herein, N-doped carbon nanotubes (CNTs) encapsulating NiCo-Se nanoparticles (NPs) are assembled to spheres (NCNTs/NiCo-Se), which are successfully synthesized by using Ni-Co prussian blue analogues (PBAs) as templates and precursors. It is rare to derive CNTs from PBAs by means of C 3 H 6 among the reported work and the structure evolution of NCNTs spheres derived from PBAs is exhibited. The high flow rate of N 2 and C 3 H 6 tend to cause short CNTs and large diameter of CNTs, respectively, owing to the dual-effect of diffusion and deposition of C atoms. Due to the advantage superposition of CNTs with high length-diameter ratio and NiCo-Se NPs, NCNTs/NiCo-Se gets excellent capabilities of charge transfer, diffusion efficiency, and electrochemical reactions. When the C 3 H 6 /N 2 is 0.2/0.3 L min −1 , the as-fabricated NCNTs/NiCo-Se deliver a substantially appreciable specific capacitance of 171.1 mAh g −1 (current density of 1 A g −1 ). The asymmetric supercapacitor (ASC) yields a maximum energy density of 55 Wh kg −1 at a power density of 801 W kg −1 . In general, this work offers an attractive route to synthesize CNTs composites from PBAs.