4.7 Article

Vanadium hexacyanoferrate nanoparticles connected by cross-linked carbon nanotubes conductive networks for aqueous zinc-ion batteries

Journal

CHEMICAL ENGINEERING JOURNAL
Volume 448, Issue -, Pages -

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.137657

Keywords

Vanadium hexacyanoferrate; Carbon nanotubes; Synergetic effect; Cathode materials; Aqueous zinc ion batteries

Funding

  1. National Natural Science Foundation of China [21875091, 51672114]

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In this study, vanadium hexacyanoferrate nanoparticles were grown on carbon nanotubes using a simple in-situ co-precipitation method to improve the conductivity of Prussian blue analogues (PBAs) as cathode materials for aqueous zinc-ion batteries (AZIBs). The hybrid structure of VHCF nanoparticles and CNTs promoted electron transport and significantly improved the utilization and storage performance of the material.
Prussian blue analogues (PBAs) have attracted increasing attention in the field of aqueous zinc-ion batteries (AZIBs) with the advantages of an open framework with adjustable valence and easy synthesis. However, due to the disadvantages of unstable structure and insufficient active sites, PBAs as cathode materials for AZIBs still have problems such as low specific capacity or poor cycle performance. In this work, a simple in-situ co -precipitation method is used to grow vanadium hexacyanoferrate (VHCF) nanoparticles on carbon nanotubes (CNTs), which aims to improve the conductivity of electrode materials by introducing a conductive skeleton of CNTs. This hybrid structure of VHCF nanoparticles and CNTs promotes electron transport between VHCF nanoparticles, thereby effectively improving the utilization of the material. Benefiting from the inherent sufficient channels for ions insertion/extraction of VHCF and the excellent conductivity of CNTs, the VHCF/CNTs hybrid as AZIBs cathode material shows excellent zinc storage performance with a high reversible capacity of 97.8 mAh g(-1) at 50 mA g(-1) and a discharge specific capacity of 52.7 mAh g(-1) after 1000 cycles at 3200 mA g(-1). This work provides a new idea for the design of high-performance PBAs-based cathodes for AZIBs.

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