Electrospun V₂O₅-doped α-Fe₂O₃composite nanotubes with tunable ferromagnetism for high-performance supercapacitor electrodes

Abstract

V 2 O 5 -doped a-Fe 2 O 3 composite nanotubes have been successfully fabricated via a simple one-step electrospinning technique followed by calcination treatment. For the first time, we found that the magnetic properties of the as-prepared samples were significantly dependent on the contents of the dopant. In comparison with pristine a-Fe 2 O 3 , perfect reversibility, more excellent capacitance and better cycling stability were simultaneously observed for the hybrid metal oxide with an appropriate mass ratio of V 2 O 5 (VFNT1) when it was utilized for supercapacitor electrodes, indicating that the doped a-Fe 2 O 3 tubular nanostructures are fairly promising for practical applications not only in magnetic recording but also in the energy storage field.

One-Step Self-Assembly Synthesis α-Fe2O3 with Carbon-Coated Nanoparticles for Stabilized and Enhanced Supercapacitors Electrode

“…The anodic oxidation peak corresponds to the oxidation of Fe 2+ to Fe 3+ and the cathodic peak corresponds to the reduction of Fe 3+ to Fe 2+ [39,40]. With the scanning rate increasing, the potential difference between the anodic and the cathodic peak in the CV curve does not change too much.…”

Advanced Ti‐Doped Fe2O3@PEDOT Core/Shell Anode for High‐Energy Asymmetric Supercapacitors

“…For instance, the calculated areal capacitance at 1 mA cm −2 for the Ti-Fe 2 O 3 @PEDOT electrode reached around 1.15 F cm −2 , which is much higher than that of Fe 2 O 3 (0.46 F cm −2 ) and Ti-Fe 2 O 3 (0.81 F cm −2 ) electrodes. [ 17,[45][46][47] There was almost no change in the CV curve of the Ti-Fe 2 O 3 @PEDOT electrode after 30 000 cycles, which further demonstrates the excellent cycling stability of Ti-Fe 2 O 3 @PEDOT. [ 47 ] Furthermore, the Ti-Fe 2 O 3 @PEDOT electrode exhibited a substantially enhanced rate capability, which led to an excellent capacitance retention of 66.8% when the current density increased from 1 to 8 mA cm −2 , which is higher than that of Fe 2 O 3 electrode and Ti-Fe 2 O 3 electrodes.…”

Asymmetric Supercapacitor Based on Chemically Coupled Hybrid Material of Fe2O3‐Fe3O4 Heterostructure and Nitrogen‐Doped Reduced Graphene Oxide

“…Rational hybridization of α‐Fe 2 O 3 with conductive carbon nanostructures, conducting polymers and metal oxides and chalcogenides such as V 2 O 5 , NiO, MnO 2 , NiCo 2 S 4 etc. has been shown to enhance the overall performance . Moreover, the surface engineering of Fe 2 O 3 by creating oxygen vacancy and coating with amorphous layer has been proposed to increase the supercapacitive performance.…”