首页|Implanting heterogeneous Ni2P/CoP catalysts in MOF–derived carbon arrays with multifunctional catalytic sites for Li–SeS2 batteries
Implanting heterogeneous Ni2P/CoP catalysts in MOF–derived carbon arrays with multifunctional catalytic sites for Li–SeS2 batteries
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NSTL
Elsevier
? 2022 Elsevier B.V.SeS2 possesses the combined merits of S and Se with considerable capacity and high electronic conductivity, but is still hindered by a shuttle effect of lithium polysulfides/polyselenides and sluggish conversion kinetics. Herein, high–efficiency heterogeneous Ni2P/CoP catalysts implanted into MOF–derived carbon arrays (Ni2P/CoP@NC) are developed to simultaneous immobilize polysulfides/polyselenides and regulate their conversion. The Ni2P/CoP catalysts with hollow and hierarchical structures extremely expose abundant catalytic and adsorption sites for LiPS/LiPSe conversion reaction. Meanwhile, the strong chemical binding of Ni2P/CoP towards LiPSs/LiPSes through Ni–S, Ni–Se, Co–S and Li–P bonds favors for the regulation of polysulfide/polyselenide conversion. The DFT calculation results corroborate the heterogeneous Ni2P/CoP interface provides depressed lithium–ion diffusion barriers to promote the polysulfide/polyselenide conversion kinetics. Benefiting from abundant catalytic and adsorption sites, strong chemical binding towards LiPSs/LiPSes and depressed lithium–ion diffusion barriers, the Ni2P/CoP@NC catalysts enable considerable specific capacities, superior rate performance and stable cycling performance for Li–SeS2 batteries.
CatalystCoPHeterostructureLi–SeS2 batteriesNi2P
Jiang Y.、Wang Y.、Han J.、Jin S.、Shen X.、Yang H.、Wang J.、Min H.、Liang P.
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College of Materials Science and Engineering Nanjing Tech University
Electron Microscope Lab Nanjing Forestry University
College of Optical and Electronic Technology China Jiliang University
NSTL
Elsevier
