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Encapsulating Carbon‐Coated MoS 2 Nanosheets within a Nitrogen‐Doped Graphene Network for High‐Performance Potassium‐Ion Storage
Author(s) -
Zhang Jingyuan,
Cui Peixin,
Gu Ying,
Wu Dajun,
Tao Shi,
Qian Bin,
Chu Wangsheng,
Song Li
Publication year - 2019
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201901066
Subject(s) - materials science , anode , graphene , nanosheet , carbon fibers , energy storage , chemical engineering , nanotechnology , electrochemistry , potassium , electrode , composite number , composite material , metallurgy , power (physics) , chemistry , physics , quantum mechanics , engineering
Potassium‐ion batteries are emerging as promising candidates for grid energy storage systems because of the abundant potassium resources and high potential. However, the discovery and development of suitable anode materials are far from the demands. Herein, ultrafine carbon‐coated MoS 2 (MoS 2 /C) nanosheets encapsulated by a nitrogen‐doped graphene network (MoS 2 /C@NDG) via a simple hydrothermal method are presented. The as‐prepared MoS 2 /C@NDG demonstrates superior rate capability of 176.6 mAh g ‐1 at a high current density of 2000 mA g ‐1 , and still remains 220.7 mAh g ‐1 at 1000 mA g ‐1 after 150 cycles. The excellent electrochemical performance can be attributed to the dual carbon encapsulated nanostructure and ultrafine 2D MoS 2 nanosheet architecture, resulting in enhanced electronic conductivity, fast K + ‐ion diffusion, and improved pseudocapacitive behavior during the depotassiation and potassiation process. Ex situ XRD and XAFS analysis reveals the K + ‐storage mechanism with potassium intercalation and conversion reaction, and demonstrates the high reversibility for the local structure of MoS 2 /C@NDG. This work paves the way for constructing advanced high‐performance anode materials of rechargeable PIBs.