Nb2CTx MXene Anchored with Carbon Quantum Dots for Lithium-Ion Batteries

Guan, Guozhen; Lu, Lei; Meng, Weixue; Ye, Tengfei; Zhang, Yingjiu; Guo, Fengmei

doi:10.1021/acsanm.3c05424

Cited by 9 publications

(1 citation statement)

References 54 publications

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“…In the context of carbon dioxide peaking and carbon neutrality, the development of advanced energy storage technology has become a new strategic goal for all countries in the world. Lithium-ion capacitors have been widely applied in the fields of rail traffic, electric automobiles, new energy power generation, the aerospace industry, and national defense and military, owing to the superior energy and power density than those of lithium-ion batteries and supercapacitors. − Two-dimensional titanium carbides and/or nitrides (MXenes) are regarded as the ideal anode materials due to their layered structure, larger specific surface areas, high electronic conductivity, adjustable surface terminals, and abundant redox sites. − MXenes can be expressed as M n +1 X n T x ( n = 1–4), where M represents early transition elements such as Ti, V, Mo, Nb, Cr, etc; X represents C and/or N; and T x represents −OH, −O, −F, −Cl surface terminals. − The energy storage mechanism in an organic system is primarily the pseudocapacitance reaction based on the intercalation of cations in the interlayer. , The solvated shell will collapse for partial solvated cations during the charging so that the exposed atomic orbitals will hybridize with the orbitals of surface terminals . The hybridization will induce the formation of a donor band of cations, which realizes the charge transfer from cations to MXene nanosheets and weakens the double-layer effect .…”

Section: Introductionmentioning

confidence: 99%

Diphosphorus Center Derived from Polyoxometalate for High-Energy Lithium Storage of MXene Nanosheets

Zhong,

Wang,

2024

ACS Appl. Nano Mater.

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Two-dimensional titanium carbide (Ti 3 C 2 T x ) is a promising lithium storage anode material owing to high conductivity and larger redox sites. However, Ti 3 C 2 T x exhibits lower specific capacitance in an organic system due to the passivation effect of surface terminals and also suffers from restacking issues with long-term cycles. Herein, the material composed of a molybdenum−phosphorus compound and Ti 3 C 2 T x nanosheets is reported through thermal decomposition of polyoxometalate. The derived molybdenum phosphide provides greater free space to afford the volume change and facilitate lithium-ion transport. The unique diphosphorus centers are favorable to improving lithium storage capacity and electrochemical reaction. In addition, molybdenum oxide with abundant oxygen vacancies not only accelerates the electronic and ionic conductivity but also provides more active sites. The optimized 0.1PMA@Ti 3 C 2 T x composite delivers a superior specific capacity of over 500 mAh g −1 at 30 mA g −1 and maintains the specific capacity of 155.6 mAh g −1 at 750 mA g −1 after 400 cycles. The lithium-ion capacitor based on the 0.1PMA@Ti 3 C 2 T x anode material presents a wonderful energy density of 153.95 Wh kg −1 at a higher power density of 4696.8 W kg −1 . This work provides a strategy for high-capacity lithium storage of MXene materials and opens up an idea for the application of polyoxometalates in lithium storage.

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Section: Introductionmentioning

confidence: 99%

Diphosphorus Center Derived from Polyoxometalate for High-Energy Lithium Storage of MXene Nanosheets

Zhong,

Wang,

2024

ACS Appl. Nano Mater.

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Recent Developments of Carbon Dots for Advanced Zinc‐Based Batteries: A Review

Yi,

Jing,

Yang

et al. 2024

Adv Funct Materials

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Rechargeable Zn‐based batteries provide a compelling supplement to subsistent energy storage devices owing to their high energy density, good safety, and low cost. Nevertheless, inherent imperfections such as dendrite growth, side reactions, and andante reaction kinetics, severely impede their commercialization. As new 0D nanomaterials, carbon dots (CDs) with unique characteristics and excellent electrochemical activity, exhibit promising potential exploitation in electrochemistry and electrocatalysis areas. Herein, the adhibition of CDs in resolving the aforementioned drawbacks of Zn‐based batteries is introduced. To begin with, concepts, physicochemical properties, and synthetic methods of CDs are discussed. Next, recent developments and advances exploiting CDs in respectively ameliorating the performance of the Zn anode, the cathode, and electrolytes of Zn ion batteries and bifunctional electrocatalytic activities including oxygen reduction reaction and oxygen evolution reaction for Zn‐air batteries, are roundly reviewed and minutely generalized. Finally, current challenges and prospects are surveyed as well, aiming to offer a reference for the blossom of advanced Zn‐based batteries.

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Carbon Dots Enabling High‐Performances Sodium‐Ion Batteries

Yang,

Ye,

Shen

et al. 2024

Chemistry A European J

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Carbon dots (CDs), known for their quantum size, abundant surface functional groups, excellent biocompatibility, and non‐toxicity, have emerged as promising candidates for enhancing various advanced rechargeable batteries. Recent research indicates that electrodes based on or modified with CDs in sodium‐ion batteries (SIBs) have shown significant improvements in key performance metrics such as Coulombic efficiency, cycle life, and capacity compared to traditional electrodes. Several key impacts of CDs contribute to these enhancements, including increased conductivity due to their conductive graphitized core, rich absorption sites, and excellent dispersity facilitated by abundant surface functional groups. These features accelerate ion transport through interface edges and ion diffusion paths, inhibit electrode material dissolution, buffer electrode material volume expansion, ensure electrode uniformity and stability, and promote the electrochemical reaction process between the electrode and electrolyte. This review summarizes recent developments, challenges, and opportunities in leveraging CDs as additives in SIBs, focusing on their impact on electrolyte properties, electrode materials, and overall battery performance. It provides a comprehensive understanding of the potential of CDs to significantly advance SIB technology.

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Nb₂CT_x MXene Anchored with Carbon Quantum Dots for Lithium-Ion Batteries

Cited by 9 publications

References 54 publications

Diphosphorus Center Derived from Polyoxometalate for High-Energy Lithium Storage of MXene Nanosheets

Diphosphorus Center Derived from Polyoxometalate for High-Energy Lithium Storage of MXene Nanosheets

Recent Developments of Carbon Dots for Advanced Zinc‐Based Batteries: A Review

Carbon Dots Enabling High‐Performances Sodium‐Ion Batteries

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