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Crystalline Co 2 V 3 O 8 @Amorphous Co−B Core‐Shell Nano‐Microsphere: Tunable Shell Layer Thickness, Faradaic Pseudocapacitive Mechanism, and Electrochemical Capacitor Applications
Author(s) -
Hou JingFeng,
Gao JianFei,
Kong LingBin
Publication year - 2021
Publication title -
batteries and supercaps
Language(s) - English
Resource type - Journals
ISSN - 2566-6223
DOI - 10.1002/batt.202100022
Subject(s) - materials science , amorphous solid , faraday efficiency , electrochemistry , chemical engineering , capacitance , electrolyte , diffusion , nanotechnology , electrode , supercapacitor , layer (electronics) , shell (structure) , composite material , crystallography , chemistry , physics , engineering , thermodynamics
The interface engineering of highly efficient electrode materials is of dominant importance for enhancing the electrochemical performance of advanced energy storage devices. Here, we demonstrate the construction of a novel crystalline@amorphous core‐shell nanostructured with Co 3 V 2 O 8 spherical particles as the cores and Co−B nanoflakes as the shells. The Co−B shell layer thickness could be tuned by changing the mass ratio of Co 3 V 2 O 8 and B source. This unique structure shows intriguing synergistic properties with increased electroactive sites and also provides effective space and a short diffusion distance for faradaic reactions. The tunable amorphous layer facilitates the electrolyte diffusion while showing elastic behavior to alleviate the volume strain of Co 3 V 2 O 8 , and also provides a path for electron transport. The resulting Co 3 V 2 O 8 @Co−B under optimum conditions exhibits a high specific capacitance, remarkable rate performance, and outstanding cycling stability. Such an effective redox approach may shed substantial light on inspiring crystalline/amorphous contacts and their derivatives for energy storage and conversion devices.