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MOF-derived high-entropy selenides with dual-conductive networks for sodium-ion storage.

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Title: MOF-derived high-entropy selenides with dual-conductive networks for sodium-ion storage.
Authors: Nan, Yuhuan1,2 (AUTHOR), Zhang, Yao1,2 (AUTHOR), Yang, Tianshuo1,2 (AUTHOR), Gao, Bingliang1,2 (AUTHOR) blgao@mail.neu.edu.cn
Source: Chemical Engineering Journal. Jun2026, Vol. 537, pN.PAG-N.PAG. 1p.
Subjects: Sodium ion batteries, Metal-organic frameworks, Energy storage, Chemical kinetics, High-entropy alloys, Chemical stability, Anodes
Abstract: Metal-organic framework (MOF)-derived carbon anodes hold immense promise for sodium-ion batteries (SIBs) but remain hindered by low initial Coulombic efficiency (ICE), sluggish kinetics, and structural degradation. To overcome these challenges, we present a high-entropy engineering strategy to fabricate a novel (FeCoNiMnCu)Se@C nanocomposite (HESe@C) via a controllable solvothermal-selenization route. Structural analysis reveals that a high configurational entropy (S conf = 1.61R) thermodynamically stabilizes the five metal species into a single-phase rock-salt cubic structure (Fm-3 m). Notably, in-situ carbothermal reduction generates highly dispersed metallic Fe0 nanoclusters within the carbon matrix, establishing a robust "dual-conductive network" that significantly accelerates electron transport. Consequently, the HESe@C anode delivers an exceptional ICE of 87% and superior rate capability, retaining 290 mAh·g−1 at an ultra-high current density of 15 A·g−1. Long-term cycling demonstrates remarkable durability with 455 mAh·g−1 retained after 2300 cycles at 1 A·g−1. Kinetic analysis confirms that the entropy-stabilized framework buffers volume expansion and leads to a dominant pseudocapacitive contribution (86.26%). Furthermore, a HESe@C|| Na 3 V 2 (PO 4) 3 full cell exhibits a practical capacity of 170 mAh·g−1 after 350 cycles. This work establishes a generic paradigm for leveraging entropy-driven structural regulation to resolve intrinsic kinetic and stability limitations in conversion-type anodes. • Entropy-driven HESe@C is constructed via MOF precursors. • High entropy (1.61 R) stabilizes the cubic rock-salt phase. • In-situ Fe0 rivets build a robust dual-conductive network. • Superior ICE of 87% and 290 mAh·g−1 at 15 A·g−1 are achieved. • The anode exhibits ultrastable cycling over 2300 cycles, with a capacity of 455 mAh·g−1. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Metal-organic framework (MOF)-derived carbon anodes hold immense promise for sodium-ion batteries (SIBs) but remain hindered by low initial Coulombic efficiency (ICE), sluggish kinetics, and structural degradation. To overcome these challenges, we present a high-entropy engineering strategy to fabricate a novel (FeCoNiMnCu)Se@C nanocomposite (HESe@C) via a controllable solvothermal-selenization route. Structural analysis reveals that a high configurational entropy (S conf = 1.61R) thermodynamically stabilizes the five metal species into a single-phase rock-salt cubic structure (Fm-3 m). Notably, in-situ carbothermal reduction generates highly dispersed metallic Fe0 nanoclusters within the carbon matrix, establishing a robust "dual-conductive network" that significantly accelerates electron transport. Consequently, the HESe@C anode delivers an exceptional ICE of 87% and superior rate capability, retaining 290 mAh·g−1 at an ultra-high current density of 15 A·g−1. Long-term cycling demonstrates remarkable durability with 455 mAh·g−1 retained after 2300 cycles at 1 A·g−1. Kinetic analysis confirms that the entropy-stabilized framework buffers volume expansion and leads to a dominant pseudocapacitive contribution (86.26%). Furthermore, a HESe@C|| Na 3 V 2 (PO 4) 3 full cell exhibits a practical capacity of 170 mAh·g−1 after 350 cycles. This work establishes a generic paradigm for leveraging entropy-driven structural regulation to resolve intrinsic kinetic and stability limitations in conversion-type anodes. • Entropy-driven HESe@C is constructed via MOF precursors. • High entropy (1.61 R) stabilizes the cubic rock-salt phase. • In-situ Fe0 rivets build a robust dual-conductive network. • Superior ICE of 87% and 290 mAh·g−1 at 15 A·g−1 are achieved. • The anode exhibits ultrastable cycling over 2300 cycles, with a capacity of 455 mAh·g−1. [ABSTRACT FROM AUTHOR]
ISSN:13858947
DOI:10.1016/j.cej.2026.176258