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Rational design of NiO/NiSe2@C heterostructure as high-performance anode for Li-ion battery.
- Source :
-
Journal of Colloid & Interface Science . Aug2023, Vol. 643, p437-446. 10p. - Publication Year :
- 2023
-
Abstract
- [Display omitted] • The yolk-shell NiO/NiSe 2 @C was prepared by carbonization, selenization and oxidation of MOF precursor. • The NiO/NiSe 2 @C exhibits a high specific capacity of 992 mAh g−1 for 600 cycles at 0.2 A g−1. • DFT shows that the heterointerface is formed which enhanced the electrochemical properties. Biphasic or multiphase heterostructures have promising futures in advanced electrode materials for energy-related applications because of their desirable synergistic effects. Here we prepared a rational NiO/NiSe 2 @C heterostructure microsphere through carbonization, selenization, and oxidation using Ni-MOF as a precursor. Electrochemical studies were conducted to examine the Li+ storage characteristics, and density functional theory (DFT) was utilized to comprehend the underlying mechanism. When employed as the anode for LIBs, the NiO/NiSe 2 @C showed a high specific capacity and long-term cyclic stability, with a specific capacity of 992 mAh g−1 for 600 cycles at a current density of 0.2 A g−1. The NiO/NiSe 2 @C exhibits a significantly enhanced lithium-ion diffusion coefficient (D Li + ) value. The DFT results show that an electron-rich area forms at the NiO/NiSe 2 heterointerface, where the metalloid selenium transfers electrons to the oxygen atoms. The lithiation reactions were improved dramatically by redistributing interfacial charges, which can trigger a built-in electric field that dramatically promotes the capacitance contribution of electrode materials, enhances the lithium storage capacity, and accelerates the ion/electron transmission. The rational synthesis of NiO/NiSe 2 @C heterostructure can provide an idea for designing novel heterostructure anode materials. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00219797
- Volume :
- 643
- Database :
- Academic Search Index
- Journal :
- Journal of Colloid & Interface Science
- Publication Type :
- Academic Journal
- Accession number :
- 163587034
- Full Text :
- https://doi.org/10.1016/j.jcis.2023.03.193