KOH-assisted aqueous synthesis of bimetallic metal-organic frameworks and their derived selenide composites for efficient lithium storage
Shuya Zhang , Yanchun Xue , Yutang Zhang , Chengxing Zhu , Xingmei Guo , Fu Cao , Xiangjun Zheng , Qinghong Kong , Junhao Zhang , Tongxiang Fan
International Journal of Minerals, Metallurgy, and Materials ›› 2023, Vol. 30 ›› Issue (4) : 601 -610.
KOH-assisted aqueous synthesis of bimetallic metal-organic frameworks and their derived selenide composites for efficient lithium storage
To solve low efficiency, environmental pollution, and toxicity for synthesizing zeolitic imidazolate frameworks (ZIFs) in organic solvents, a KOH-assisted aqueous strategy is proposed to synthesize bimetallic ZIFs polyhedrons, which are used as precursors to prepare bimetallic selenide and N-doped carbon (NC) composites. Among them, Fe-Co-Se/NC retains the three-dimensional (3D) polyhedrons with mesoporous structure, and Fe-Co-Se nanoparticles are uniform in size and evenly distributed. When assessed as anode material for lithium-ion batteries, Fe-Co-Se/NC achieves an excellent initial specific capacity of 1165.9 mAh·g−1 at 1.0 A·g−1, and the reversible capacity of Fe-Co-Se/NC anode is 1247.4 mAh·g−1 after 550 cycles. It is attributed to that the uniform composite of bimetallic selenides and N-doped carbon can effectively tune redox active sites, the stable 3D structure of Fe-Co-Se/NCs guarantees the structural stability and wettability of the electrolyte, and the uniform distribution of Fe-Co-S nanoparticles in size esuppresses the volume expansion and accelerates the electrochemical reaction kinetics.
potassium hydroxide assisted aqueous strategy / bimetallic zeolitic imidazolate frameworks / bimetallic selenide / lithium-ion batteries / long cycle performance
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