P‐Doped NiTe₂ with Te‐Vacancies in Lithium–Sulfur Batteries Prevents Shuttling and Promotes Polysulfide Conversion

Advanced Materials, Год журнала: 2022, Номер 34(11)

Опубликована: Янв. 12, 2022

Lithium-sulfur (Li-S) batteries have been hindered by the shuttle effect and sluggish polysulfide conversion kinetics. Here, a P-doped nickel tellurium electrocatalyst with Te-vacancies (P⊂NiTe2-x ) anchored on maize-straw carbon (MSC) nanosheets, served as functional layer (MSC/P⊂NiTe2-x separator of high-performance Li-S batteries. The P⊂NiTe2-x enhanced intrinsic conductivity, strengthened chemical affinity for polysulfides, accelerated sulfur redox conversion. MSC nanosheets enabled NiTe2 nanoparticle dispersion Li+ diffusion. In situ Raman ex X-ray absorption spectra confirmed that MSC/P⊂NiTe2-x restrained -based cell has cyclability 637 mAh g-1 at 4 C over 1800 cycles degradation rate 0.0139% per cycle, high performance 726 6 C, areal capacity 8.47 cm-2 under configuration 10.2 mg , low electrolyte/sulfur usage ratio 3.9. This work demonstrates vacancy-induced doping heterogeneous atoms enables durable electrochemistry can impact future electrocatalytic designs related to various energy-storage applications.

Язык: Английский

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Rational Design of MOF-Based Materials for Next-Generation Rechargeable Batteries

Nano-Micro Letters, Год журнала: 2021, Номер 13(1)

Опубликована: Окт. 6, 2021

Abstract Metal–organic framework (MOF)-based materials with high porosity, tunable compositions, diverse structures, and versatile functionalities provide great scope for next-generation rechargeable battery applications. Herein, this review summarizes recent advances in pristine MOFs, MOF composites, derivatives, composite derivatives high-performance sodium-ion batteries, potassium-ion Zn-ion lithium–sulfur lithium–oxygen Zn–air batteries which the unique roles of MOFs as electrodes, separators, even electrolyte are highlighted. Furthermore, through discussion MOF-based each system, key principles controllable synthesis electrochemical performance improvement mechanisms discussed detail. Finally, major challenges perspectives also proposed

Язык: Английский

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Heterostructures Regulating Lithium Polysulfides for Advanced Lithium‐Sulfur Batteries

Advanced Materials, Год журнала: 2023, Номер 35(47)

Опубликована: Май 31, 2023

Sluggish reaction kinetics and severe shuttling effect of lithium polysulfides seriously hinder the development lithium-sulfur batteries. Heterostructures, due to unique properties, have congenital advantages that are difficult be achieved by single-component materials in regulating efficient catalysis strong adsorption solve problems poor serious In this review, principles heterostructures expediting conversion anchoring detailedly analyzed, application as sulfur host, interlayer, separator modifier improve performance batteries is systematically reviewed. Finally, need solved future study prospected. This review will provide a valuable reference for advanced

Язык: Английский

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Ordered Mesoporous Carbon Grafted MXene Catalytic Heterostructure as Li-Ion Kinetic Pump toward High-Efficient Sulfur/Sulfide Conversions for Li–S Battery

ACS Nano, Год журнала: 2023, Номер 17(2), С. 1653 - 1662

Опубликована: Янв. 6, 2023

Lithium–sulfur (Li–S) batteries exhibit unparalleled theoretical capacity and energy density than conventional lithium ion batteries, but they are hindered by the dissatisfactory "shuttle effect" sluggish conversion kinetics owing to low transport kinetics, resulting in rapid fading. Herein, a catalytic two-dimensional heterostructure composite is prepared evenly grafting mesoporous carbon on MXene nanosheet (denoted as OMC-g-MXene), serving interfacial kinetic accelerators Li–S batteries. In this design, grafted can not only prevent stack of nanosheets with enhanced mechanical property also offer facilitated pump for accelerating diffusion. Meanwhile, exposed defect-rich OMC-g-MXene inhibits polysulfide shuttling chemical interactions between polysulfides thus simultaneously enhances electrochemical efficiency, fully investigated situ/ex situ characterizations. Consequently, cells pumps achieve high cycling (966 mAh g–1 at 0.2 C after 200 cycles), superior rate performance (537 5 C), an ultralow decaying 0.047% per cycle 800 cycles 1 C. Even employed sulfur loading 7.08 mg cm–2 under lean electrolyte, ultrahigh areal 4.5 acquired, demonstrating future practical application.

Язык: Английский

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Synergetic Anion Vacancies and Dense Heterointerfaces into Bimetal Chalcogenide Nanosheet Arrays for Boosting Electrocatalysis Sulfur Conversion

Advanced Materials, Год журнала: 2022, Номер 34(13)

Опубликована: Янв. 27, 2022

Vacancy and interface engineering are regarded as effective strategies to modulate the electronic structure enhance activity of metal chalcogenides. However, practical application chalcogenides in lithium-sulfur (Li-S) batteries is limited by their low conductivity, rapid decline catalytic activity, large volume variation during discharging/charging process. Herein, bimetal sulfide (CoZn-S) nanosheet arrays with sulfur vacancies dense heterointerfaces proposed accelerate conversion improve performance Li-S batteries. Systematic investigations reveal that sulfur-vacancy build-in interfacial field CoZn-S facilitate electron transfer regulate structure. The well-designed 3D array structures shorten ion-transport pathway inhibit fluctuation electrocatalysis Density functional theory studies confirm built-in vacancy can promote thermodynamic formation decomposition Li2 S, thus improving intrinsic activity.

Язык: Английский

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Emerging MXene@Metal–Organic Framework Hybrids: Design Strategies toward Versatile Applications

ACS Nano, Год журнала: 2021, Номер 15(12), С. 18742 - 18776

Опубликована: Ноя. 18, 2021

Rapid progress on developing smart materials and design of hybrids is motivated by pressing challenges associated with energy crisis environmental remediation. While emergence versatile classes nanomaterials has been fascinating, the real excitement lies in hybrid tunable properties. Metal-organic frameworks (MOFs) are key for gas sorption electrochemical applications, but their sustainability challenged limited chemical stability, poor electrical conductivity, intricate, inaccessible pores. Despite tremendous efforts towards improving stability MOF materials, little made researchers inclined toward materials. MXenes, a family two-dimensional transition-metal carbides, nitrides carbonitrides, known compositional versatility formation range structures rich surface chemistry. Hybridization MOFs functional layered MXene may be beneficial if host structure provides appropriate interactions stabilizing desired Recent have focused integrating Ti3C2Tx V2CTx MXenes to result augmented physicochemical properties, widening scope emerging applications. This review discusses potential strategies MXene@MOF hybrids, attributes properties resulting applications water treatment, sensing, storage, textiles, electrocatalysis. Comprehensive discussions recent rapidly evolving various future directions highlighted.

Язык: Английский

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Designing principles of advanced sulfur cathodes toward practical lithium‐sulfur batteries

SusMat, Год журнала: 2022, Номер 2(1), С. 34 - 64

Опубликована: Янв. 24, 2022

Abstract As one of the most promising candidates for next‐generation energy storage systems, lithium‐sulfur (Li‐S) batteries have gained wide attention owing to their ultrahigh theoretical density and low cost. Nevertheless, road commercial application is still full thorns due inherent sluggish redox kinetics severe polysulfides shuttle. Incorporating sulfur cathodes with adsorbents/catalysts has been proposed be an effective strategy address foregoing challenges, whereas complexity resulting from intricate design parameters greatly influences corresponding density, which frequently ignored. In this review, recent progress in strategies advanced summarized significance compatible regulation among active materials, tailored hosts, elaborate cathode configuration clarified, aiming bridge gap between fundamental research practical Li‐S batteries. The representative classified by encapsulation, host architecture, are first highlighted illustrate synergetic contribution electrochemical performance improvement. Feasible integration principles also guide cathodes. Finally, prospects future directions provided realize high long‐life

Язык: Английский

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Recent progress of MOF/MXene-based composites: Synthesis, functionality and application

Coordination Chemistry Reviews, Год журнала: 2023, Номер 490, С. 215208 - 215208

Опубликована: Май 18, 2023

Язык: Английский

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Engineering Catalytic CoSe–ZnSe Heterojunctions Anchored on Graphene Aerogels for Bidirectional Sulfur Conversion Reactions

Advanced Science, Год журнала: 2021, Номер 9(1)

Опубликована: Окт. 27, 2021

Sluggish sulfur reduction and lithium sulfide (Li2 S) oxidation prevent the widespread use of lithium-sulfur (Li-S) batteries, which are attractive alternatives to Li-ion batteries. The authors propose that a transition metal selenide heterojunction (CoSe-ZnSe) catalytically accelerates bidirectional conversion reactions. A combination synchrotron X-ray absorption spectroscopy density functional theory calculations show highly active heterointerface with charge redistribution structure distortion effectively immobilizes species, facilitates Li ion diffusion, decreases Li2 S energy barriers. CoSe-ZnSe catalytic cathode exhibits high areal capacities, good rate capability, superior cycling stability capacity fading 0.027% per cycle over 1700 cycles. Furthermore, heterojunctions anchored on graphene aerogels (CoSe-ZnSe@G) enhance ionic transport activity under loading lean electrolyte conditions. 8.0 mAh cm-2 is achieved at an electrolyte/sulfur ratio 3 µL mg-1 . This study demonstrates importance engineering in boosting Li-S battery performances.

Язык: Английский

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Dynamic Intercalation–Conversion Site Supported Ultrathin 2D Mesoporous SnO₂/SnSe₂ Hybrid as Bifunctional Polysulfide Immobilizer and Lithium Regulator for Lithium–Sulfur Chemistry

ACS Nano, Год журнала: 2022, Номер 16(7), С. 10783 - 10797

Опубликована: Июнь 27, 2022

The practical application of lithium-sulfur batteries is impeded by the polysulfide shuttling and interfacial instability metallic lithium anode. In this work, a twinborn ultrathin two-dimensional graphene-based mesoporous SnO2/SnSe2 hybrid (denoted as G-mSnO2/SnSe2) constructed immobilizer regulator for Li-S chemistry. as-designed G-mSnO2/SnSe2 possesses high conductivity, strong chemical affinity (SnO2), dynamic intercalation-conversion site (LixSnSe2), inhibits shuttle behavior, provides rapid Li-intercalative transport kinetics, accelerates LiPS conversion, decreases decomposition energy barrier Li2S, which evidenced ex situ XAS spectra, in Raman, XRD, DFT calculations. Moreover, with lithiophilic characteristics enables homogeneous Li-ion deposition Li dendrite growth. Therefore, separator achieve favorable electrochemical performance, including sulfur utilization (1544 mAh g-1 at 0.2 C), high-rate capability (794 8 long cycle life (extremely low attenuation rate 0.0144% each 5 C over 2000 cycles). Encouragingly, 1.6 g S/Ah-level pouch cell realizes density up to 359 Wh kg-1 under lean E/S usage 3.0 μL mg-1. This work sheds light on design roadmap tackling S-cathode Li-anode challenges simultaneously toward long-durability

Язык: Английский

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