Cu‐Driven Active Cu₂Se@MXene Heterointerface Reconstruction and Co Electron Reservoir Toward Superior Sodium Storage

Advanced Energy Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 19, 2025

Abstract Heterostructure engineering and active component reconstruction are effective strategies for efficient rapid charge storage in advanced sodium‐ion batteries (SIBs). Herein, sandwich‐type CoSe 2 @MXene composites used as a model to reconstruct new Cu Se@MXene heterostructures by situ electrochemical driving. The MXene core provides interconnected pathways electron ion conduction, while also buffering volumetric expansion stabilize the structure. This reconstructed heterointerface features abundant sodium sites, enhanced Na + adsorption, diffusion kinetics, thus increasing capacity. Moreover, elevated Co valence state during discharge process allows it act an reservoir provide additional supply Se conversion accelerate kinetics. When employed anode SIBs, electrode exhibits high capacity (694 mAh g −1 at 0.1 A ), excellent rate performance (425 20 exceptional durability (437 after 10 000 cycles 5 with 0.0014% decay per cycle). mechanism of is further revealed through ex characterization theoretical calculations. work approach designing conversion‐type anodes SIBs.

Язык: Английский

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Tailoring Self‐Catalytic N─Co Bonds into Heterostructure Architectures: Deciphering Polytellurides Conversion Mechanism Toward Ultralong‐Lifespan Potassium Ion Storage

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Март 11, 2025

Abstract Transition metal tellurides (TMTes) are promising anodes for potassium‐ion batteries (PIBs) due to their high theoretical specific capacity and impressive electronic conductivity. Nevertheless, TMTes suffer from persistent degradation the large volume expansion, ion‐diffusion energy barriers, dissolution/shuttle of potassium polytellurides (K x Te y ). Herein, a heterostructured CoTe 2 composite equipped with self‐catalytic center (N‐CoTe /LTTC) is developed, exploiting its low‐tortuosity tunneling, chemical tunability, properties elevate cycling stability new heights. Systematic experiments have verified that elaborate N‐CoTe /LTTC provides short‐range efficient electron/ion transport path, accelerates K + diffusion kinetics, suppresses huge distortion. Notably, N─Co bonds can promote adsorption capabilities accelerate conversion kinetics under synergistic effect heterojunction. Consequently, optimized electrode delivers an ultralong‑lifespan cyclability (over 25 000 cycles at 2.0 A g −1 , only 0.0019% decay rate per cycle), outperforming those reported Te‐based anodes. Finally, /LTTC//PTCDA@450 full cell manifests 4300 This work uncovers impact catalytic centers on valuable insights rationally designing ultralong‐lifespan PIBs.

Язык: Английский

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In-situ electrochemical XRD and raman probing of ion transport dynamics in ionic liquid-etched Ti3C2Tx MXene for energy storage applications

Chemical Engineering Journal, Год журнала: 2024, Номер unknown, С. 158232 - 158232

Опубликована: Дек. 1, 2024

Язык: Английский

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Amorphous/Crystalline Heterostructured Nanomaterials: An Emerging Platform for Electrochemical Energy Storage

Small, Год журнала: 2025, Номер unknown

Опубликована: Фев. 28, 2025

Abstract With the expanding adoption of large‐scale energy storage systems and electrical devices, batteries supercapacitors are encountering growing demands challenges related to their capability. Amorphous/crystalline heterostructured nanomaterials (AC‐HNMs) have emerged as promising electrode materials address these needs. AC‐HNMs leverage synergistic interactions between amorphous crystalline phases, along with abundant interface effects, which enhance capacity output accelerate mass charge transfer dynamics in electrochemical (EES) devices. Motivated by elements, this review provides a comprehensive overview synthesis strategies advanced EES applications explored current research on AC‐HNMs. It begins summary various Diverse devices AC‐HNMs, such metal‐ion batteries, metal–air lithium–sulfur supercapacitors, thoroughly elucidated, particular focus underlying structure–activity relationship among amorphous/crystalline heterostructure, performance, mechanism. Finally, perspectives for proposed offer insights that may guide continued development optimization.

Язык: Английский

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Tellurium-doped MoS2/carbon composite nanotubes for potassium-ion capacitors

Applied Physics Letters, Год журнала: 2024, Номер 125(26)

Опубликована: Дек. 23, 2024

Potassium-ion capacitors (PICs) combine the benefits of high energy density and excellent power at a lower cost than lithium storage technology. However, developing high-rate stable anode materials that are compatible with capacitor-type counterparts remains formidable challenge. In this study, tellurium-doped MoS2/carbon composite nanotubes (Te-MoS2/C NTs), featuring one-dimensional hollow structure decorated interlayer-extended few-layer nanosheets, were designed as for potassium storage. The Te-MoS2/C NTs achieve notable average reversible capacity 417.8 mA h g−1 0.05 A 215.0 5.0 g−1. Additionally, it maintains retention rate 95.6% after 300 cycles 2.0 Moreover, functional theory calculations validate enhanced K+ adsorption diffusion, attributed to Te doping interlayer expansion MoS2. PICs based on also achieves an 113.6 W 12.1 kW kg−1, alongside cycling stability.

Язык: Английский

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Multi‐Component Phase Engineering Strategy Modulates Potassiation Reaction Energy Barrier of Alloying Anode for Stable Potassium Storage

Small, Год журнала: 2025, Номер unknown

Опубликована: Фев. 5, 2025

Abstract Red phosphorus (RP) has received much attention in potassium storage because of its inexpensive cost and high theoretical capacity, but faces the issues volume expansion poor conductivity. Fortunately, phosphorus–selenium hybridization solves these by forming an alloy anode that combines RP's capacity with Se's But weak chemical affinity between RP Se makes it often difficult to form stable homogeneous mixtures during preparation. To address this, this study introduces hexagonal boron nitride (h‐BN) as a bridging source facilitate close coupling composite phases. The optimized multi‐component exhibits initial coulombic efficiency (ICE reaching 73.0%), good cycling stability (3000 cycles at 1 A g −1 ), outstanding rate performance (a discharge specific 157.3 mAh g⁻¹ even 2 g⁻¹). Further investigation reveals introduction h‐BN reduces activation energy for interfacial charge transfer K + cross solid electrolyte interphase (SEI). It also decreases Gibbs free change (ΔG) potassiation reaction's decisive step. Therefore, third phase enhances effect alloy‐based composites, providing method designing secondary battery electrodes capacity.

Язык: Английский

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Revealing the Mechanism of Ni Vacancies on Ion Storage, Diffusion Kinetics, and Electrochromic Performance of Nickel Oxide Electrodes

Small, Год журнала: 2025, Номер unknown

Опубликована: Март 3, 2025

Abstract Solar radiation can be dynamically regulated by the electrochromic smart window, showing great potential in reducing building energy consumption. As one of most paramount inorganic materials, NiO remains elusive intricacies process, particularly regarding functional mechanisms defects. Here, mechanism Ni vacancies (V ) on ionic storage, diffusion kinetics, and performance are systematically investigated. The active V provides ion storage sites promotes transport lithium (Li + forming channels, increasing capacity from 2.12 to 4.90 mC cm −2 . By introducing sub‐gap absorptions, increases NiO's optical modulation 14.4% 30.3% with excellent cyclic stability (retain 87.4% after 4000 cycles). In contrast, nonactive barely contributes because a high barrier, causing low transmittance bleached state. Furthermore, enables devices exhibit superior response speed, but negatively affects transparency These results provide valuable guidance for high‐quality electrodes through defect engineering developing high‐performing NiO‐based devices.

Язык: Английский

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Lithium Intercalation Chemistry in TaS2 Nanosheets for Lithium-Ion Batteries Anodes

Nanomaterials, Год журнала: 2025, Номер 15(8), С. 626 - 626

Опубликована: Апрель 19, 2025

Exploring novel two-dimensional layered transitional metal dichalcogenides and elucidating their reaction mechanism are critical to designing promising anode materials for lithium-ion batteries (LIBs). Herein, a TaS2 nanosheet was obtained via typical solid-phase method followed by simple ball-milling treatment, first explored experimentally as an LIBs. The delivered excellent cycling stability, with 234.6 mAh g−1 after 500 cycles at 1 A g−1. optimized performance could be attributed the large interlayer spacing, high conductivity, reduced size of nanosheet, which effectively alleviated volume change during process accelerated Li+ or e− transport. Especially, presented unusual intercalation mechanism, accompanied reversible phase transition from 2H 1T de-lithiation process, is evidenced multiple ex situ characterizations, further revealing enhanced electrochemical results larger spacing higher electrical conductivity. This work provides insight into TaS2, shows potential in high-performance

Язык: Английский

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Ultrafast Na⁺ Diffusion Enabled by Defective 3D in₂S₃/MXene Nanostructure toward High‐Rate Sodium Ion Batteries

Advanced Energy Materials, Год журнала: 2025, Номер unknown

Опубликована: Апрель 21, 2025

Abstract Slow diffusion kinetics caused by the low conductivity and large volume changes of metal sulfides (MSs) during repeated sodiation/desodiation processes greatly limit implementation high‐rate sodium ion batteries (SIBs). To address this, inspired vacancy defect engineering, for first time, defective 3D In 2 S 3 /MXene nanostructure with high‐density vacancies strong interface bonding is developed as fast‐charging anode SIBs. This design enables material to have a Na + energy barrier (0.28 eV) absorption (−1.68 eV), resulting in high coefficient (5.01 × 10 −12 cm s −1 ) pseudocapacitive contribution 97.3%. Moreover, exhibits reversible multistep intercalation‐conversion reaction mechanism superior electrochemical kinetics. Consequently, assembled SIBs display performance (202.2 mAh g at 100 A long‐term cycling stability over 5000 cycles 0.0074% decay per cycle 20 . On this basis, Na‐ion full cell assembled, indicating practical application material. study sheds light on functional electrode materials long‐lifespan storage devices.

Язык: Английский

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An Enhanced “Trapping−Conversion” Function Enables Ultrastable Potassium Ion Storage

Advanced Science, Год журнала: 2025, Номер unknown

Опубликована: Май 8, 2025

Abstract Metal chalcogenides (MCs) have emerged as promising candidates for potassium ion battery (KIB) anode materials, yet the sluggish redox kinetics and notorious shuttle effect inescapability lead to inferior rate performance poor cyclability. Herein, a P‐doped PbTe/MXene (P‐PbTe/MXene) superstructure is rationally constructed by decorating PbTe on MXene via hydrothermal reaction followed bifunctional P‐doping, where P heteroatoms enter both lattice. The P‐PbTe/MXene shows enhanced suppressed of polytellurides due chemical adsorption stemming from low energy gaps between d‐band center p‐band P‐MXene. As result, superior storage properties, including high reversible capacity (289.1 mAh g −1 at 0.2 A after 200 cycles), outstanding (151.3 20 ), ultrastable cyclability (180.1 mA h 2.0 2000 cycles) in half battery. Also, exhibits density (186.0 Wh kg 0.1 ) excellent bending stability soft‐package full cells.

Язык: Английский

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