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Confining MoSe2 Nanosheets into N‑Doped Hollow Porous Carbon Microspheres for Fast-Charged and Long-Life Potassium-Ion Storage
journal contribution
posted on 2021-12-11, 13:29 authored by Fulan Zhong, Anding Xu, Qi Zeng, Yijun Wang, Guilan Li, Zhiguang Xu, Yurong Yan, Songping WuThe potassium-ion battery (PIB) is
the most promising alternative
to a lithium-ion battery (LIB). Exploitation of a suitable electrode
material is crucial to promote the development of PIBs. The MoSe2 material has attracted much attention due to its high theoretical
capacity, unique layered structure, and good conductivity. However,
the potassium storage property of MoSe2 has been suffering
from structural fragmentation and sluggish reaction kinetic caused
by large potassium ions upon insertion/extraction, which needs to
be further improved. Herein, the MoSe2 nanosheets are confined
into N-doped hollow porous carbon microspheres (MoSe2@N-HCS)
by spray drying and high-temperature selenization. It delivers a superior
rate performance of 113.7 mAh g–1 at 10 A g–1 and remains at a high capacity of 158.3 mAh g–1 at 2 A g–1 even after 16 700
cycles for PIBs. The excellent electrochemical performance can be
attributed to unique structure, N-doping, and robust chemical bonds.
The storage mechanism of MoSe2 for potassium ions was explored.
The outstanding properties of MoSe2@N-HCS make it a promising
anode material for PIBs.
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superior rate performancerobust chemical bondsexcellent electrochemical performance16 700 cyclessuitable electrode material7 mah g3 mah gunique layered structurepromising anode materialhigh theoretical capacitypotassium storage property2 subunique structurepromising alternativehigh capacitystorage mechanismion storagetemperature selenizationstructural fragmentationspray dryingpotassium ionsoutstanding propertieslife potassiumlib ).ion batterygood conductivity