N‐doped carbon‐coated CoSe2 nanocrystals anchored on two‐dimensional MXene nanosheets for efficient electrochemical sodium‐ and potassium‐ion storage

Summary Sodium‐ion batteries (SIBs) and potassium‐ion batteries (KIBs) have received much attention as next‐generation energy storage systems owing to the abundance. Nevertheless, they face great challenges in the design of optimum electrode materials for practical applications. Herein, we prepared...

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Bibliographic Details
Published in:International journal of energy research 2021-10, Vol.45 (12), p.17738-17748
Main Authors: Oh, Hong Geun, Yang, Su Hyun, Kang, Yun Chan, Park, Seung‐Keun
Format: Article
Language:English
Subjects:
anode
Batteries
Carbon
cobalt selenide
composite
Crystals
Cycles
Electrochemical analysis
Electrochemistry
Electrode materials
Electrodes
Energy storage
Imidazole
Ion storage
MXene
MXenes
Nanocrystals
Nanosheets
Potassium
potassium‐ion battery
Rechargeable batteries
Sodium
Sodium-ion batteries
sodium‐ion battery
Stability
Storage batteries
Storage systems
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Summary:Summary Sodium‐ion batteries (SIBs) and potassium‐ion batteries (KIBs) have received much attention as next‐generation energy storage systems owing to the abundance. Nevertheless, they face great challenges in the design of optimum electrode materials for practical applications. Herein, we prepared a unique two‐dimensional structured composite consisting of N‐doped carbon‐coated CoSe2 nanocrystals and MXene nanosheets (CoSe2@NC/MX) for efficient electrochemical Na‐ and K‐ion storage. In this strategy, a Co‐based zeolitic imidazole framework (ZIF‐67) was deposited on the surface of MXene nanosheets, and the subsequent selenization process resulted in the transformation of the ZIF‐67 into CoSe2@NCs. The unique structure can shorten the transport pathways for electrons/ions and provide sufficient space to accommodate the volume change of the active materials. Furthermore, the N‐doped carbon matrix and MXene can enhance the robustness of the electrode materials. Accordingly, the composites exhibited enhanced electrochemical performance in terms of cycle stability (317 mA h g−1 after 200 cycles at 0.5 A g−1) and rate capability (343 mA h g−1 at 7.0 A g−1) for SIBs. For KIBs, they exhibited a high reversible capacity of 358 mA h g−1 at 0.5 A g−1 after 100 cycles and 276 mA h g−1 at a high rate of 2.0 A g−1. Unique structured two‐dimensional composites consisting of N‐doped carbon‐coated CoSe2 nanocrystals and MXene nanosheets were first synthesized via a facile method. The synthesized composite has many features that are favorable for Na‐ and K‐ion storage, such as fast transport rate for electron/ions and mechanical robustness. Accordingly, it exhibited excellent electrochemical performance in terms of cycle stability and rate capability when used as an anode for the Na‐ and K‐ion batteries.
ISSN:0363-907X
1099-114X
DOI:10.1002/er.7004