A Metal Coordination Number Determined Catalytic Performance in Manganese Borides for Ambient Electrolysis of Nitrogen to Ammonia

Advanced Materials, Год журнала: 2024, Номер 36(21)

Опубликована: Фев. 11, 2024

Abstract A new strategy that can effectively increase the nitrogen reduction reaction performance of catalysts is proposed and verified by tuning coordination number metal atoms. It found intrinsic activity Mn atoms in manganese borides (MnB x ) increases tandem with their B Electron‐deficient boron are capable accepting electrons from atoms, which enhances adsorption N 2 on catalytic sites (*) hydrogenation to form *NNH intermediates. Furthermore, reduces charge density at Fermi level, facilitates desorption ammonia catalyst surface. Notably, MnB 4 compound a up 12 exhibits high yield rate (74.9 ± 2.1 µg h −1 mg cat Faradaic efficiency (38.5 2.7%) −0.3 V versus reversible hydrogen electrode (RHE) 0.1 m Li SO electrolyte, exceeding those reported for other boron‐related catalysts.

Язык: Английский

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Ultrasmall CoFe Bimetallic Alloy Anchored on Fluoride‐Free MXene by One‐Pot Etching Strategy for the Barrier‐Adsorption‐Catalyst Functions of Polysulfides in Lithium‐Sulfur Batteries

Advanced Functional Materials, Год журнала: 2024, Номер 34(23)

Опубликована: Фев. 7, 2024

Abstract The rational construction of electrocatalysts has sparked a growing interest in accelerating redox kinetics polysulfide and effectively restricting the “shuttle effect” Li‐S batteries. In this work, novel MXene‐supported ultrasmall Co 3 Fe 7 bimetallic alloy hybrids are fabricated via one‐pot molten salt etching strategy. Ti AlC 2 precursor can be directly converted to ‐MXene using environmentally friendly approach, eliminating need for acid/alkaline treatments complex procedures. Meanwhile, particles situ formed tightly anchored on MXene substrate. By simple coating, modified separator functions as barrier inhibit shuttle effect. Furthermore, electrochemical tests theoretical calculations demonstrate that exhibits exceptional adsorption capacity remarkable catalytic ability toward polysulfides, owing synergistic effect alloy. Consequently, cells assembled with achieve high capacity, excellent rate performance, superior cycle stability. This study provides comprehensive insight into design alloys efficient LiPSs high‐performance long‐life

Язык: Английский

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Recent advances in carbon-based anodes for high-performance sodium-ion batteries: Mechanism, modification and characterizations

Materials Today, Год журнала: 2024, Номер 75, С. 334 - 358

Опубликована: Май 9, 2024

Язык: Английский

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Three Birds with One Stone: Multifunctional TiN‐MXene‐Co@CNTs Network as Sulfur/Lithium Host for High‐Areal‐Capacity Lithium‐Sulfur Batteries

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(35)

Опубликована: Июнь 13, 2024

Abstract The inevitable shuttling and slow redox kinetics of lithium polysulfides (LiPSs) as well the uncontrolled growth Li dendrites have strongly limited practical applications lithium‐sulfur batteries (LSBs). To address these issues, we innovatively constructed carbon nanotubes (CNTs) encapsulated Co nanoparticles in situ grown on TiN‐MXene nanosheets, denoted TiN‐MXene‐Co@CNTs, which could serve simultaneously both sulfur/Li host to kill “three birds with one stone” (1) efficiently capture soluble LiPSs expedite their conversion, (2) accelerate nucleation/decomposition solid 2 S, (3) induce homogeneous deposition. Benefiting from synergistic effects, TiN‐MXene‐Co@CNTs/S cathode a sulfur loading 2.5 mg cm −2 show high reversible specific capacity 1129.1 mAh g −1 after 100 cycles at 0.1 C, ultralong cycle life over 1000 1.0 C. More importantly, it even achieves areal 6.3 50 under 8.9 low E/S ratio 5.0 μL . Besides, TiN‐MXene‐Co@CNTs deliver stable plating/striping behavior h.

Язык: Английский

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One-step growth of ultrathin CoSe2 nanobelts on N-doped MXene nanosheets for dendrite-inhibited and kinetic-accelerated lithium–sulfur chemistry

Science Bulletin, Год журнала: 2024, Номер 69(13), С. 2059 - 2070

Опубликована: Март 21, 2024

Язык: Английский

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A 3D hydrangea-like NiMoO4/rGO/PANI hybrid composite for high performance asymmetric supercapacitor

Electrochimica Acta, Год журнала: 2024, Номер 477, С. 143756 - 143756

Опубликована: Янв. 1, 2024

Язык: Английский

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Atom-Dominated Relay Catalysis of High-Entropy MXene Promotes Cascade Polysulfide Conversion for Lithium-Sulfur Batteries

Energy & Environmental Science, Год журнала: 2024, Номер unknown

Опубликована: Янв. 1, 2024

The high-entropy TiVNbMoC 3 MXene, with its atom-dominated relay catalysis effect and resilient lattice configuration, promotes a cascade of sulfur conversions guides uniform Li + deposition, enabling shuttle-free dendrite-free Li–S batteries.

Язык: Английский

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Fluorine‐Free MXenes: Recent Advances, Synthesis Strategies, and Mechanisms

Small, Год журнала: 2023, Номер 20(16)

Опубликована: Дек. 6, 2023

Abstract MXenes, an exceptional class of 2D materials, possess high conductivity, adaptable surface chemistry, mechanical strength, and tunable bandgaps, making them attractive for diverse applications. Unlocking the potential MXenes requires precise control over synthesis methods functionality. Conventionally, fluorine‐based etchants are used in synthesis, posing both environmental concerns alterations to properties, along with introduction certain defects. This prompts exploration innovative fluorine‐free strategies synthesis. review focuses on environmentally friendly, techniques MXene emphasizing mechanisms recent breakthroughs alternative etching strategies. The comprehensive coverage includes electrochemical etching, Lewis acid‐driven molten salt alkaline/hydrothermal techniques, chemical vapor deposition (CVD), methods. Fluorine‐free yields terminations such as ─O, ─OH, ─Cl, etc., influencing chemistry improving their properties. presence ─OH groups NaOH etched boosts energy storage, while ─Cl functionality from acidic salts optimizes performance. mitigate adverse effects ─F electronic properties broadening In addition traditional approaches, this delves into novel tailoring It comprehensively addresses challenges, opportunities, future perspectives MXenes.

Язык: Английский

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Rapid Growth of Bi₂Se₃ Nanodots on MXene Nanosheets at Room Temperature for Promoting Sulfur Redox Kinetics

Inorganic Chemistry, Год журнала: 2024, Номер 63(19), С. 8853 - 8862

Опубликована: Май 1, 2024

Li–S batteries are hampered by problems with their cathodes and anodes simultaneously. The improvement of needs to consider both the anode cathode. Herein, a Bi2Se3@MXene composite is prepared for first time rapidly growing Bi2Se3 nanodots on two-dimensional (2D) MXene nanosheets at room temperature through simply adding high-reactive hydroxyethylthioselenide in Bi3+/MXene aqueous solution. exhibits 2D structure due template effect MXene. can not only facilitate conversion lithium polysulfides (LiPSs) but also inhibit shuttling S cathode its catalytic adsorption force LiPSs. be used as an interfacial lithiophilic layer Li dendrite growth metal anode. Theoretical calculations reveal that effectively boost ability LiPSs, accelerate electron transport. Under bidirectional regulation cathode, battery shows enhanced electrochemical performance.

Язык: Английский

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Advances in MXene-based composite materials for efficient removal of radioactive nuclides and heavy metal ions

Materials Today Physics, Год журнала: 2024, Номер 44, С. 101444 - 101444

Опубликована: Апрель 23, 2024

Язык: Английский

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