ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Haowen Chen,Kaiyi Luo,Pingping Qian,Yixiao Deng,An Li,Qiang Sun,Lei Yang,Yuquan Liu,Zhengshang Wang,Guang-Kun Ren,Qian Cao,Jun Tang
The donor effect of polycrystalline n-type bismuth telluride (Bi2Te3) during sample preparation usually results in the peak thermoelectric figure of merit (ZT) at temperatures above 400 K, severely restricting its application in the room-temperature (RT) range. A leap in RT performance requires innovative strategies that replace conventional methods of regulating point defects with limited effectiveness. We demonstrate excellent thermoelectric performance with an RT figure of merit, ZT = 1.2, and a maximum ZT = 1.3 at 325 K, by regulating the high-potential barrier heterointerfaces composed of La2O3 nanoparticles (NPs) and Bi2Te2.7Se0.3 (BTS). The created energy barriers at grain boundaries scatter and localize carriers through O–Bi ionic bonding and O–Te hybridization, enhancing the density of states in adjacent regions and leading to a rapid rise in the RT Seebeck coefficient (from 148.67 μV K–1 to 222.84 μV K–1 at 300 K). Another aspect of La2O3 NPs, as the second term of nano-oxide, introduces multiscale defect-scattering phonons, thereby enhancing thermal performance. Finally, at temperature difference ΔT = 10 K, a maximum output voltage and power, Vmax = 239.73 mV and Pmax= 10.50 mW, can be achieved with the fabricated TE module. Our findings underscore the full potential for promoting the performance of thermoelectric materials in the lower temperature region via high-energy barrier interface engineering.
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IEEE TRANSACTIONS ON ELECTRON DEVICES
·
2025
·Vol. 72
·期 12
·6872-6878
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IF 3.2
Xiyuan Zhang,Wenhua Zou,Junhong Duan
In this study, titanium dioxide (TiO ${}_{{2}}\text {)}$ nanoparticles co-doped with varying ratios of Eu and Sm were synthesized using a hydrothermal method. The energy bandgap ( ${E}_{\text {g}}\text {)}$ and conduction band minimum (CBM) of TiO2 nanoparticles doped with 0.45 at% Sm@0.1 at% Eu were adjusted from 3.43 and −3.95 eV to 3.30 and −3.53 eV, respectively, determined from ultraviolet–visible (UV–Vis) absorption spectroscopy and ultraviolet photoelectron spectroscopy (UPS) measurements compared to undoped TiO2. CdSe quantum dot-sensitized solar cells (QDSCs) based on TiO2 doped with 0.45 at% Sm@0.1 at% Eu achieved an optimal power conversion efficiency (PCE) of 4.37%. Electrochemical impedance spectroscopy (EIS) revealed that the decrease in chemical capacitance ( ${\textit C}_{\mu }\text {)}$ and the increase in recombination resistance ( ${\textit R}_{\text {rec}}\text {)}$ of QDSCs based on 0.45 at% Sm@0.1 at% Eu-doped TiO2 photoanodes facilitate charge extraction and suppress charge recombination at the TiO2/electrolyte (EL) interface compared to undoped one.
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Nanoscale
·
2025
·
IF 5.1
Zhongshi Zhang,Jing Xia,Xuanze Li,Lifeng Tian,Suijiang Cai,Jing Li,Qing Meng,Jiangtao Li,Chang Liu,Xiangmin Meng
Ferroelectricity in two-dimensional (2D) materials at room temperature has attracted considerable interest due to their significant potential in electrical applications. However, studies on the precisely controlled synthesis of 2D ferroelectric materials remain limited so far. Here in, this work reports a novel large-area 2D ferroelectric material AgCrSe2 synthesized via CVD method. Nonlinear optical measurement demonstrate that AgCrSe2 nanoflakes grown at 880 °C exhibit strong second harmonic generation (SHG) responses. Atomic-scale characterization reveals that the displacement of Ag sublattices generates switchable dipoles, inducing both in-plane and out-of-plane ferroelectricity. This dipole alignment, verified by piezoresponse force microscopy (PFM), exhibits a high piezoelectric effective d33 (0.48 pm V−1) and reversible switching via electric-field-driven Ag+ migration across an energy barrier of 0.34 eV. Furthermore, ferroelectric devices with an ultrathin 9.4 nm active layer exhibit a robust remanent polarization of 1.5 μC cm−2, a coercive field of 5 kV cm−1, and stable nonvolatile resistive states with on/off ratios exceeding 102. This study expands the selection of 2D ferroelectric materials and provides new opportunities for the development of ferroelectric devices.
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Nature Communications
·
2025
·Vol. 16
·期 1
·10895
·
IF 15.7
Wang Wei,Wang Xinying,Yang Huanhuan,Yu Zhipeng,Zhang Weicai,Huang Haoliang,Zhao Zaowen,Zheng Xuerong,Liu Lifeng,Deng Yida,Li Yunyong
A rational design principle for selecting optimal anion dopants in transition-metal compounds to enhance sulfur redox activity is lacking in Li-S batteries. Herein, we propose an accurate p-p-s orbital electronic coupling descriptor (involving the p -orbitals of anion dopants and anions in transition-metal compounds and the s -orbitals of Li in lithium polysulfides) as a criterion for choosing anion dopants to guide the development of efficient anion-doped Li-S catalysts through machine-learning, theoretical, and experimental validation. We reveal the relationship between the electronic properties of various anion-doped WSe 2 and the thermodynamics and kinetics of sulfur redox. Our findings show that moderate p-p-s orbital electronic coupling optimizes polysulfide adsorption, facilitating Li 2 S nucleation and decomposition, thereby minimizing Gibbs free energy and maximizing catalytic efficiency for sulfur redox. A volcano relationship between the p-p-s coupling strength and catalytic activity is established. The optimal B-WSe 2 /MXene catalyst achieves a ~ 3 Ah pouch cell with 430 Wh kg −1 specific energy and good cycle life (81.3% capacity retention over 71 cycles). These findings provide a guideline for designing efficient anion-doped Li-S catalysts with moderate p-p-s coupling to enable rapid sulfur catalytic conversion in Li-S batteries.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Guowei Huang,Ruichao Wang,Wenchao Wu,Wangle Xue,Peng Wang,Hongli Li,Zhenbin Gong
Nanofriction plays an important role in the performance and lifetime of n-type or p-type TMD-based semiconductor nanodevices. However, the mechanism of nanofriction in n-type and p-type TMD semiconductors under an electric field is still blurry. In this paper, monolayers of n-MoSe2 and p-WSe2 materials were prepared by chemical vapor deposition (CVD), and their nanofriction behavior under positive electric field was investigated. Atomic force microscopy (AFM) was used to analyze the nanofriction by the positive voltage applied through the needle tip: both the friction and the friction coefficient of MoSe2 increased with the increase of the applied voltage, while the friction and the friction coefficient of WSe2 decreased with the increase of the applied voltage. As the applied voltage increases, the friction force and energy dissipation exhibit corresponding trends in relation to the surface potential. The accumulation and dissipation of carriers represent significant factors influencing friction change. The diverse types of carriers give rise to variations in the friction laws. Our experiments have revealed the differences and mechanisms of friction in TMD materials dominated by different carrier types at positive voltages. It provides guidance for the application and modulation of n- and p-type two-dimensional semiconductor materials in the field of friction.
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ADVANCED FUNCTIONAL MATERIALS
·
2025
·Vol. 35
·期 36
·2425475
·
IF 19
Sai Dong,Zhuo Chen,Huibin Liu,Ying Zhang,Xiaoteng Yan,Zhijie Cui,Zhaohua Jiang,Jing Li,Huiting Xu,Wenchao Peng,Jiapeng Liu
Aqueous copper-selenium (Cu-Se) batteries have received increasing attention in energy storage research due to their high theoretical specific capacity and inherent safety. However, the sluggish reaction kinetics of the selenium (Se) cathode hinder its development. Herein, an accordion-like structure transition metal boride (Mo 4/3 B 2 T z MBene) with ordered metal vacancies is synthesized and employed as Se catalytic host material for aqueous Cu-Se batteries. The Mo 4/3 B 2 T z host material exhibits a unique layered structure, abundant active sites, and high electrical conductivity, which significantly improves the kinetic properties of the selenium redox reaction in aqueous Cu-Se batteries. As a result, the Se-Mo 4/3 B 2 T z cathode delivers a high discharge capacity of 1010 mAh g −1 at 1 A g −1 and greatly enhances rate performance with a reversible capacity of 693 mAh g −1 at 25 A g −1 . Meanwhile, the Se-Mo 4/3 B 2 T z cathode maintains an impressive 755 mAh g −1 discharge capacity after 1500 cycles at 20 A g −1 . Furthermore, the conversion mechanism of aqueous Cu-Se batteries is illustrated by different characterization methods and density functional theory calculations. This work introduces a distinctive approach to accelerating the reaction kinetics of aqueous Cu-Se batteries via MBene-based catalytic host material.
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Microstructures
·
2025
·Vol. 5
·期 3
·N
·
IF 9
Fulong Liu,Yuqing Sun,Zhihao Li,Panpan Peng,Chunlei Wang,Hongchao Wang
Quaternary chalcogenides have garnered considerable interest within the field of thermoelectric due to their intrinsic low thermal conductivity, wide bandgap and high element enrichment advantages. In this work, the thermoelectric performance of Cu2MnSnSe4 was enhanced by co-optimizing the carrier concentration and lattice thermal conductivity through self-doping with Cu and doping with Te. A series of Cu2MnSnSe4 and Cu2.1Mn0.9SnSe4-xTex (x = 0, 0.01, 0.05, 0.10) samples were prepared by ball-milling and hot-pressing methods. The carrier concentration of the samples was significantly increased after Cu self-doping, leading to optimized electrical transport performance. The notable reduction in lattice thermal conductivity was attributed to the scattering effect caused by Te substitution-induced point defects. At 673 K, the lattice thermal conductivity of the Cu2.1Mn0.9SnSe3.9Te0.1 sample obtained the lowest value of 0.62 W m-1K-1. Finally, it achieved a maximum zT ~ 0.5 at 673 K in the Cu2.1Mn0.9SnSe3.9Te0.1 sample, roughly twice that of the Cu2MnSnSe4 sample.
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CHEMISTRY OF MATERIALS
·
2025
·
IF 7
Rong Zou,Wenwu Liu,Binhang Zhao,Jie Zhang,Lei Zhao,Xuejun Ren,Haifei Zhang,Fen Ran
Sulfur-containing polymers are promising cathode materials for lithium batteries, offering a novel pathway toward high-energy batteries. Moreover, tuning the frontier orbital energy levels of sulfur-containing polymers can accelerate the electrochemical reaction kinetics. Herein, an organic cathode material containing selenium is synthesized using a selenium sulfide solid solution via a previously proposed thiol-sulfur click chemistry reaction, which is a rubber-like material with good mechanical properties. According to front-line orbital theory, the introduction of a selenium group VI element like sulfur leads to sp3 hybridization and S–Se covalent bond formation. Owing to the electronegativity disparity between sulfur and selenium, electrons accumulate near sulfur atoms, creating nucleophilic sites and continuous negative regions that promote Li+ transport. As a result, the Li+ diffusion coefficient increases from 9.7 × 10–13 cm2 S–1 to 2.7 × 10–12 cm2 S–1. The bandgap narrows from 4.14 to 3.89 eV, facilitating the lithiation process and enhancing electrochemical performance. Among the cathode materials with different selenium contents, the fabricated materials exhibit a superior initial capacity of 580 mAh g–1 at 0.05 C and longer cycle stability. This study reveals how doping-modulated frontier orbital energy levels can be employed to enhance reaction kinetics, offering insights for improving sulfur containing polymers–lithium batteries’ performance.
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Journal of Advanced Dielectrics
·
2025
·
IF 2.4
Weixiang Huang,Shiliang Kang,Long Chen,Yanqing Fu,Linling Tan,Chengwei Gao,Wenjie Xie,Changgui Lin
Fiber infrared evanescent wave-temperature dual sensor can detect both organic molecules and temperature, demonstrating potential applications in healthcare, petrochemical industries and advanced energy storage systems. However, current fiber sensors are strictly limited to either infrared evanescent wave or temperature sensing, primarily due to the absence of suitable fiber sensing media. Here, a high-performance infrared evanescent wave-temperature dual sensor based on single Ge 2 1 Se 3 Te 7 6 chalcogenide glass fiber is developed. The obtained fiber exhibits a high Seebeck coefficient of 1410 μ V/K, a precise temperature resolution of 0.03 K, a fast response time of 6 s and superior infrared evanescent wave sensing performance. Furthermore, the fibers can be integrated into a textile to detect temperature distribution and simultaneously detect organic substances such as ethanol and urea. These findings highlight that the fiber with superior infrared evanescent wave-temperature sensing performance may find potential applications in multifunctional sensing.
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ADVANCED MATERIALS
·
2025
·
IF 26.8
Haoyu Yue,Zhongnan Guo,Wenjing Guo,Ruonan Yao,Shuang Zhen,Qiansu Ma,Ming Chen,Jiawei Lin,Wenxia Yuan
The high-entropy strategy offers a viable pathway to activate the inert basal plane of transition metal dichalcogenides (TMDs) for electrocatalysis. This work demonstrates that the “lattice distortion effect”, one of the core effects of high-entropy materials, plays a crucial role in activating the basal plane of TMDs. A high-entropy diselenide (ReNbTaMoW)Se 2 (denoted as HESe 2 ) is synthesized via solid-state reaction. Single-crystal X-ray diffraction and atomic resolution scanning transmission electron microscopy reveal a unique fivefold-modulated structure in HESe 2 , which unexpectedly distorts the rigid trigonal prismatic motif. HESe 2 exhibits exceptional activity for hydrogen evolution reaction (HER), showing a low overpotential of 31 mV at a current density of 10 mA cm −2 , comparable to state-of-the-art precious metal catalysts. In situ X-ray photoelectron spectroscopy indicates that the distorted structure of HESe 2 remains stable during the HER process. A proton exchange membrane (PEM) electrolyser assembled with HESe 2 cathodic catalyst shows competitive performance and durability with negligible degradation over 400 h. Density functional theory calculations reveal the electron accumulation regions induced by lattice distortion as high-activity sites, thereby driving the augmented HER performance of HESe 2 . This work presents a universal strategy for boosting the basal plane activity of layered materials through unique lattice distortion effect.
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JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Kai Lan,Ting Feng,Zheng Gong,Honglei Zhang,Fengzhang Ren,Fang Wang
To break the inherent limitations of poor conductivity and electrochemical activity in transition metal selenides, electronic structure engineering is regarded as the most feasible strategy. Herein, leveraging the advantage that high mobility of Cu 2+ can easily form non-stoichiometric compounds, a rapid coordination-coupled one-step selenization strategy is employed to prepare Cys-CS-Se composite, which is Sb/S co-doped and rich in copper vacancies. The active groups of cysteine can coordinate with Cu 2+ to fabricate a sulfur-containing precursor with an ordered stacked nanosheet. This unique nanostructure facilitates the exposure of active sites and electron transfer, thereby accelerating reaction kinetics. Notably, the simultaneous incorporation of Sb/S can not only modulate the electronic structure of Cu 2-X Se, enhance its intrinsic electrical conductivity, and enable rapid charge transfer, but also provide additional sodium adsorption sites, thereby boosting sodium storage capacity. Furthermore, the formed Cu-vacancies further enhance sodium adsorption capability and create more adsorption sites. Based on these advantages, the optimized Cys-CS-Se offers an outstanding initial discharge capacity of 498.4 mAh g −1 at 0.1 A g −1 , excellent cycling performance (318 mAh g −1 over 550 cycles at 3 A g −1 ), and rate capability. This work provides a reference for the design of novel transition metal chalcogenide anodes with dual doping.
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Biomaterials Science
·
2017
·Vol. 5
·期 6
·1174-1182
·
IF 4.21
Qiurong Deng,Xudong Li,Lipeng Zhu,Hua He,Donglai Chen,Yongbing Chen,Lichen Yin
The transfection performance of polycations is often hampered by various systemic barriers that pose conflicting requirements for material design. Herein, we developed fluorinated, ROS-cleavable polyethylenimine (PEI) for effective and serum-resistant gene delivery to cancer cells, by harmonizing the inconsistency between DNA condensation and release, and the inconsistency between cellular internalization and serum stability. Low-molecular weight (MW) PEI was cross-linked with a diselenide-containing linker and further modified with fluorocarbon chains. The obtained high-MW DSe-PEI-F has potent DNA condensation as well as intracellular DNA delivery capabilities, while in the cytoplasm of cancer cells, it can rapidly degrade into low-MW segments upon ROS treatment to promote DNA release and reduce the material toxicity. As such, DSe-PEI-F showed high transfection efficiencies in cancer cells in the presence of serum, outperforming the commercial reagent PEI 25k by several orders of magnitude. This study thus provides an effective approach to overcome various barriers against non-viral gene delivery, which contributes to the development of a new class of gene vectors with high efficiency and low toxicity.
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