Issue 12, 2023

Self-assembled nanoflower-like FeSe2/MoSe2 heterojunction anode with enhanced kinetics for superior-performance Na-ion half/full batteries

Abstract

Transition metal selenides are a research hotspot in sodium-ion batteries (SIBs). However, slow kinetics and rapid capacity decay due to volume changes during cycling limit their commercial applications. Heterostructures have the ability to accelerate charge transport and are widely used in energy storage devices due to their abundant active sites and lattice interfaces. A rational design of heterojunction electrode materials with excellent electrochemical performance is essential for SIBs. Herein, a novel anode material heterostructured FeSe2/MoSe2 (FMSe) nanoflower for SIBs was successfully prepared through a facile co-precipitation and hydrothermal route. The as-prepared FMSe heterojunction exhibits excellent electrochemical performance, including a high invertible capacity (493.7 mA h g−1 after 150 cycles at 0.2 A g−1), long-term cycling stability (352.2 mA h g−1 even after 4200 cycles at 5.0 A g−1) and competitive rate capability (361.2 mA h g−1 at 20 A g−1). By matching with a Na3V2(PO4)3 cathode, it can even exhibit ideal cycling stability (123.5 mA h g−1 at 0.5 A g−1 after 200 cycles). Furthermore, the sodium storage mechanism of the FMSe electrodes was systematically determined by ex situ electrochemical techniques. Theoretical calculation also reveals that the heterostructure on the FMSe interface enhances charge transport and promotes reaction kinetics.

Graphical abstract: Self-assembled nanoflower-like FeSe2/MoSe2 heterojunction anode with enhanced kinetics for superior-performance Na-ion half/full batteries

Supplementary files

Article information

Article type
Communication
Submitted
29 Nov 2022
Accepted
21 Feb 2023
First published
21 Feb 2023

Nanoscale, 2023,15, 5655-5664

Self-assembled nanoflower-like FeSe2/MoSe2 heterojunction anode with enhanced kinetics for superior-performance Na-ion half/full batteries

S. Li, H. Zhang, Y. Cao, S. Zhang, Z. Liu, C. Yang, Y. Wang and B. Wan, Nanoscale, 2023, 15, 5655 DOI: 10.1039/D2NR06672F

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