In Situ Anchoring Ultrafine ZnS Nanodots on 2D MXene Nanosheets for Accelerating Polysulfide Redox and Regulating Li Plating

Advanced Materials, Год журнала: 2023, Номер 35(32)

Опубликована: Май 11, 2023

Lithium-sulfur (Li-S) battery is a promising energy storage system due to its cost effectiveness and high density. However, formation of Li dendrites from metal anode shuttle effect lithium polysulfides (LiPSs) S cathode impede practical application. Herein, ultrafine ZnS nanodots are uniformly grown on 2D MXene nanosheets by low-temperature (60 °C) hydrothermal method for the first time. Distinctively, nanodot-decorated (ZnS/MXene) can be easily filtered flexible freestanding film in several minutes. The ZnS/MXene used as current collector Li-metal promote uniform deposition superior lithiophilicity nanodots. powders obtained freeze drying separator decorator address LiPSs their excellent adsorbability. Theoretical calculation proves that existence obviously improve adsorption ability with Li+ LiPSs. Li-S full cells composite modified exhibit remarkable rate cycling performance. Other transition sulfides (CdS, CuS, etc.) also strategy.

Язык: Английский

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Recent Advances and Perspectives of Lewis Acidic Etching Route: An Emerging Preparation Strategy for MXenes

Nano-Micro Letters, Год журнала: 2023, Номер 15(1)

Опубликована: Март 15, 2023

Abstract Since the discovery in 2011, MXenes have become rising star field of two-dimensional materials. Benefiting from metallic-level conductivity, large and adjustable gallery spacing, low ion diffusion barrier, rich surface chemistry, superior mechanical strength, exhibit great application prospects energy storage conversion, sensors, optoelectronics, electromagnetic interference shielding biomedicine. Nevertheless, two issues seriously deteriorate further development MXenes. One is high experimental risk common preparation methods such as HF etching, other difficulty obtaining with controllable groups. Recently, Lewis acidic a brand-new strategy for MXenes, has attracted intensive attention due to its safety ability endow uniform terminations. However, comprehensive review etching method not been reported yet. Herein, we first introduce following four aspects: mechanism, terminations regulation, in-situ formed metals delamination multi-layered Further, applications MXene-based hybrids obtained by route sensors microwave absorption are carefully summarized. Finally, some challenges opportunities also presented.

Язык: Английский

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Selective Potassium Deposition Enables Dendrite‐Resistant Anodes for Ultrastable Potassium‐Metal Batteries

Advanced Materials, Год журнала: 2023, Номер 35(30)

Опубликована: Апрель 17, 2023

Instability at the solid electrolyte interface (SEI) and uncontrollable growth of potassium dendrites have been pressing issues for potassium-ion batteries. Herein, a self-supporting electrode composed bismuth nitrogen-doped reduced graphene oxide (Bi80 /NrGO) is designed as an anode host potassium-metal Following molten diffusion into Bi80 /NrGO, resulting K@Bi80 /NrGO exhibits unique hollow pores that provide K+ -diffusion channels deposition space to buffer volume expansion, thus maintaining structure SEI stability. The also provides controlled electric field promotes uniform flux, abundant potassiophilic N sites, Bi alloying active collectively enabling precise nucleation selective achieve dendrite-resistant anodes. With /NrGO-based optimized electrodes, assembled symmetrical cells can sustain stable cycling over 3000 h current density 0.2 mA cm-2 . Full with Prussian blue cathode exhibit high stability (with no degradation 1960 cycles 1000 g-1 ) 99% Coulombic efficiency. This work may lead design anodes triple attributes nucleation, smooth diffusion, dendrite inhibition, ideal developing beyond.

Язык: Английский

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Two-dimensional MXenes for flexible energy storage devices

Energy & Environmental Science, Год журнала: 2023, Номер 16(10), С. 4191 - 4250

Опубликована: Янв. 1, 2023

The design strategies and internal mechanisms of MXene-based materials in flexible energy storage devices are comprehensively introduced. Besides, the current trends, limitations, future outlooks proposed.

Язык: Английский

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A 3D Framework with Li₃N–Li₂S Solid Electrolyte Interphase and Fast Ion Transfer Channels for a Stabilized Lithium‐Metal Anode

Advanced Materials, Год журнала: 2022, Номер 35(8)

Опубликована: Дек. 8, 2022

The Li-metal anode has been recognized as the most promising for its high theoretical capacity and low reduction potential. However, major drawbacks of Li metal, such reactivity large volume expansion, can lead to dendrite growth solid electrolyte interface (SEI) fracture. An in situ artificial inorganic SEI layer, consisting lithium nitride sulfide, is herein reported address issues. Porous graphene oxide films are doped with sulfur nitrogen (denoted SNGO) work an effective host. SNGO film enables formation inorganic-rich which facilitates transport Li-ions, improves mechanical strength, avoids In addition, COMSOL simulation results reveal that microchannels fabricated by 3D printing technique further shorten Li-ion transfer pathways homogenize heat stress distribution batteries. As a result, assembled shows fading 0.1% per cycle at 2 C rate cathode. utilization host provide stable negative/positive electrode ratios under 3 LiS

Язык: Английский

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Robust MXene adding enables the stable interface of silicon anodes for high-performance Li-ion batteries

Chemical Engineering Journal, Год журнала: 2022, Номер 452, С. 139139 - 139139

Опубликована: Сен. 11, 2022

Язык: Английский

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Hierarchical Porous N‐doped Carbon Encapsulated Fluorine‐free MXene with Tunable Coordination Chemistry by One‐pot Etching Strategy for Lithium–Sulfur Batteries

Advanced Energy Materials, Год журнала: 2023, Номер 13(29)

Опубликована: Июнь 17, 2023

Abstract Continuous and considerable exploration of two–dimensional transition metal carbides nitrides (MXenes)toward interlayer spacing expansion, surface termination modification composition architecture construction has aroused significant interest in energy storage fields. Nevertheless, their employment remains severely impeded by a fundamental lack comprehension the coordination chemistry MXenes. Herein, hierarchical porous N‐doped carbon encapsulated fluorine‐free Ti 3 C 2 T x with tunable is fabricated novel one‐pot etching strategy. The coordinated N manipulated phase reconstruction identified high‐angle annular dark‐field scanning transmission electron microscopy X‐ray photoelectron spectroscopy. Moreover, nitrogen‐doped carbons (HPNC) are distinctly observed that result multifold increase material area derived from substantial increment micro‐ mesoporosity. structural synergistic effect N, HPNC heighten binding reduce barriers accelerate redox kinetics, boosts physical immobilization lithium polysulfides. aforementioned MXenes modified separators endow lithium–sulfur batteries reversible capacity 889.5 mA h g −1 retention 79.5% after 100 cycles at 0.5 A . Overall, this work affords universal strategy terms directly synthesizing fluoride‐free MXene toward exploring correlation between electrochemical properties.

Язык: Английский

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Construction of Co₃O₄/ZnO Heterojunctions in Hollow N‐Doped Carbon Nanocages as Microreactors for Lithium–Sulfur Full Batteries

Advanced Science, Год журнала: 2023, Номер 10(19)

Опубликована: Апрель 20, 2023

Lithium-sulfur (Li-S) batteries are promising alternatives of conventional Li-ion attributed to their remarkable energy densities and high sustainability. However, the practical applications Li-S hindered by shuttling effect lithium polysulfides (LiPSs) on cathode Li dendrite formation anode, which together leads inferior rate capability cycling stability. Here, an advanced N-doped carbon microreactors embedded with abundant Co

Язык: Английский

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MXene-Based Nanomaterials for Multifunctional Applications

Materials, Год журнала: 2023, Номер 16(3), С. 1138 - 1138

Опубликована: Янв. 29, 2023

MXene is becoming a “rising star” material due to its versatility for wide portfolio of applications, including electrochemical energy storage devices, electrocatalysis, sensors, biomedical membranes, flexible and wearable etc. As these applications promote increased interest in research, summarizing the latest findings on this family materials will help inform scientific community. In review, we first discuss rapid evolutionary change MXenes from reported M2XTx structure last M5X4Tx structure. The use systematically modified synthesis routes, such as foreign atom intercalation, tuning precursor chemistry, etc., be further discussed next section. Then, review their composites/hybrids rapidly growing batteries, supercapacitors, electrocatalysts, biomedical, electromagnetic interference shielding, devices. More importantly, notice that excellent metallic conductivity with hydrophilic nature distinguishes other materials, properties can by surface functionalization. outperform pristine many applications. addition, summary using MXene-based overcome application-specific drawbacks provided few sections. We hope information integrate lab-scale into commercially viable products.

Язык: Английский

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Tunnel‐Oriented VO₂ (B) Cathode for High‐Rate Aqueous Zinc‐Ion Batteries

Advanced Materials, Год журнала: 2024, Номер 36(25)

Опубликована: Март 16, 2024

Tunnel-type vanadium oxides are promising cathodes for aqueous zinc ion batteries. However, unlike layer-type with adjustable layer distances, enhancing ion-transport kinetics in tunnels characterized by fixed sizes poses a considerable challenge. This study highlights that the macroscopic arrangement of electrode crucially determines tunnel orientation, thereby influencing transport. By changing material morphology, orientation can be optimized to facilitate rapid diffusion. In proof-of-concept demonstration, it is revealed (00l) facets-dominated VO

Язык: Английский

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