V2O3 Nanoparticles Confined in High-Conductivity and High- Throughput Carbon Nanofiber Nanohybrids for Advanced Sodium-Ion Capacitors

Electrode materials with high conductivity and high mass transport rate are highly desirable for a variety of electrochemical energy devices but face a grand challenge to be readily prepared yet. Here, we propose the design and preparation of a nanohybrid of V2O3 nanoparticles embedded in a multichannel carbon nanofiber (V2O3@MCNF) network with high conductivity and high mass transport. We demonstrate the V2O3@MCNF shows superior capability for sodium storage with an excellent capacity of 214.3 mA h g(-1) even at 5 A g(-1), thanks to its high conductivity for electron transfer and facilitated mass transportation endowed by the one-dimensional conductive multichannel fiber structure. Such favorable structures and properties in V2O3@MCNF enable them to be applied as high-performance anodes of sodium-ion hybrid capacitors (SIHCs), successfully addressing the critical kinetics imbalance between Faradaic anodes and capacitive cathodes for application of SIHCs, which show impressively high energy/power densities along with impressive cycling performance over 10,000 cycles.

Automated summary

The study introduces a nanohybrid material V2O3@MCNF with high conductivity and mass transport rate, suitable for high-performance sodium-ion hybrid capacitors. This material addresses the kinetic imbalance issue between Faradaic anodes and capacitive cathodes in SIHCs, demonstrating impressive capacity and cycling performance.