Small Methods
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2026
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IF 8.7
Abdul Basit,Xin Li,Jiwu Xin,Muhammad Baseer Haider,Junyou Yang
Manganese telluride (MnTe) has been proposed to be a favorable candidate for middle range temperature thermoelectric (TE) material; whereas, the low carrier concentration and higher thermal conductivity have restricted its applications. Herein, a crucial role of Cu-ion in synthesized MnTe with the addition of Cu 2 Se through mechanical alloying and hot press sintering facilitate the improvement of carrier density and thus enhanced power factor of MnTe with the incorporation of 8 at.% Cu 2 Se due to novel liquid-like behavior of Cu-ion in Cu 2 Se at elevated temperatures. Moreover, the excessive hole density of Cu 2 Se and the undissolved nano-scale Cu 2 Se results in a remarkable scattering of phonons and thus suppressed lattice thermal conductivity at higher temperatures. With this approach, the overall thermoelectric performance of MnTe + x at.% Cu 2 Se was investigated and we found enhancement in the thermoelectric performance with the inclusion of Cu 2 Se with a maximum ZT of ∼0.72 in 8 at.% Cu 2 Se added MnTe sample at 873 K.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Qian Zhao,Jiabo Zhang,Guoqing Xia,Shilong Ma,Shaofeng Fan,Xuecheng Ping,Liang Hao,Yaran Zhang
This study investigates the effect of Cu 2 Se doping on the morphology, structure, and reaction process of MgB 2 superconductors . Polycrystalline MgB 2 samples with different Cu 2 Se doping levels were synthesized using the conventional solid-state sintering method. A comprehensive analysis of the phase formation, microstructure, and sintering mechanisms was investigated. The results indicated that Cu 2 Se reacted with Mg at temperatures below 650 °C, forming Mg 2 Cu and MgSe phases, which leads to a reduction in the Mg content during the solid-state reaction process. This reaction pathway promotes the regeneration of the MgB 2 phase through the interaction between Mg 2 Cu and B. The novel approach not only eliminates the high porosity caused by Mg evaporation above 650 °C but also enhances the critical current density of MgB 2 by introducing secondary phase such as MgSe and MgCu 2 nanoparticles . The results suggest that Cu 2 Se doping provides a promising way for optimizing the unique microstructure and highly density of MgB 2 superconductor.
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高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
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2021
·Vol. 127
·期 2
·79
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IF 2.584
Xue Lisha,Shen Weixia,Zhang Zhuangfei,Fang Chao,Zhang Yuewen,Jia Xiaopeng
Motivated by prototypes that the heavy-element doping can effectively tune carrier and phonon transport behavior, we studied the influence of Bi doping on the thermoelectric properties of Cu 2 Se synthesized by high-pressure and high-temperature technique. With the increased Bi contents, the carrier mobility of Bi x Cu 2 Se samples distinctly decreased, while the Seebeck coefficient and electrical resistivity increased. The Bi x Cu 2 Se samples exhibited multiple microstructures including abundant grain boundaries, micropores and lattice defects. Various phonon scattering mechanisms generated relatively low lattice thermal conductivity below 0.55 Wm −1 K −1 for all Cu 2 Se-based samples. The lattice thermal conductivity of Cu 2 Se-based samples increased after Bi doping due to reduced degree of disorder of Cu + ions, which weakened phonon scattering. Due to the significantly reduced thermal conductivity, a peak zT value of 1.57 at 873 K was obtained for Bi 0.005 Cu 2 Se sample, which was 25% higher than that of pristine Cu 2 Se (zT ~ 1.25). This work indicates the potential of heavy-element doping in boosting performance for liquid-like thermoelectrics.
研究领域:
材料科学
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热电材料
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高压合成
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固体物理
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高影响因子
MODERN PHYSICS LETTERS B
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2019
·
IF 0.929
Lisha Xue,Chao Fang,Weixia Shen,Manjie Shen,Wenting Ji,Yuewen Zhang,Zhuangfei Zhang,Xiaopeng Jia
High-pressure technique is an effective route to synthesize thermoelectric materials and tune transport properties simultaneously. In this work, S-doped copper–selenium compounds ( Cu 2 Se 1 − x S x , 0 ≤ x ≤ 0 . 0 5 ) were successfully synthesized by high-pressure and high-temperature (HPHT) technology in just 30 min. Cu 2 Se 1 − x S x samples show layered morphology composed of abundant pores and lattice defects. The appropriate S introduction ( x = 0 . 0 1 and 0.03) can effectively enhance Seebeck coefficient and reduce the thermal conductivity of Cu 2 Se . Compared with the pure Cu 2 Se sample, Cu 2 Se 0 . 9 7 S 0 . 0 3 exhibits a 30% lower thermal conductivity, but the decline of power factor by the distinctly increased electrical resistivity at high temperature results in a smaller zT at temperature > 6 5 0 K. The variations of thermoelectric properties are resulted from the competitive effects between S-doping and actual composition change (Cu:S). It indicates that S-doping is not so effective in improving the zT value of Cu 2 Se materials by high-pressure synthesis.
研究领域:
材料科学
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热电材料
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高压合成
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DOI
高影响因子
VACUUM
·
2026
·
IF 4.3
Lvlv Gao,Enshen Zhang,Chen Chen,Rui Li,Yongchao Liu,Lei Zhou,Kai Chen,Junjie Chu,Shiliu Yang
Transition metal selenides (TMSes), such as bimetallic selenides, are potential anodes for sodium-ion batteries (SIBs) because of their satisfied redox performances. Nevertheless, the sluggish electrochemical reaction rate and large volume expansion hinder their widespread application. To solve these disadvantages, constructing heterostructure and hollow structure are considered effective strategies. In this work, a polyhedron-templated approach is developed to synthesize uniform Cu 2 O polyhedrons, which are subsequently converted into nitrogen-doped carbon coated CuFeSe 2 /Cu 2 Se (Cu-Fe-Se@NC) via solvent thermal and annealing method. The constructed abundant heterointerfaces accelerate Na + adsorption, while the unique hollow core-shell structure effectively relieves volume expansion. Furthermore, density functional theory (DFT) calculation results indicated that the Na adsorption energies of Cu-Fe-Se@NC were higher than those of CuFeSe 2 @NC and Cu 2 Se@NC. As a result, the Cu-Fe-Se@NC anode exhibited remarkable rate performance (303 mAh g −1 , 10 A g −1 ) and superior cycling stability. This work offers a practical pathway for designing high-performance TMSes anodes through strategic heterostructure and morphology control.
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高影响因子
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Siping Li,Gangyong Li,Zhi Li,Wenyuan Xu,Liang Chen,Wei Wang,Binhong He,Minjie Zhou,Zhaohui Hou
Transition metal selenides (TMSs) become one of the most promising cathode materials for rechargeable aluminum batteries (RABs) due to the advantages of high specific capacity, low cost, and simple preparation process. However, TMSs are soluble in the acidic chloroaluminate ionic liquid electrolyte during cycling, leading to undesirable electrochemical performance. Herein, rechargeable Al-Cu 2 Se batteries are fabricated with acetylene black modified separator (AB/GF/A) showing excellent electrochemical performance with capacity retention of 95 mAh g −1 after 5000 cycles at 0.5 A g −1 and 166.1 mAh g −1 at 1.0 A g −1 . By combining electrochemical tests and ex situ spectroscopy and electronic microscope characterizations, it is revealed that the dissolved Cu and Se species adsorbed on the surface of AB/GF/A still remain electroactivity, which transforms the diffusion-controlled mechanism of Cu 2 Se to surface pseudocapacitance-controlled behavior, thus suppressing the shuttle effects and boosting the reaction kinetics. The in-depth understanding of the functionalized separator in energy storage mechanism of TMSs could provide reference for further progress of RABs in the future work.
研究领域:
材料科学
·
电化学
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高影响因子
ELECTROCHIMICA ACTA
·
2026
·
IF 5.8
Yonghong Lu,Siping Li,Zhi Li,Zhaodi Wang,Huilong Song,Zhifang Chen,Yangyang Chen,Gangyong Li,Zhaohui Hou
A dual-protection strategy suppresses polyselenide shuttling and volume expansion for stable Al batteries. • Cu 2 Se/CoSe 2 heterointerfaces accelerate redox kinetics and optimize electronic structure for Al storage. • Hollow carbon nanotubes buffer mechanical strain and confine active species during cycling. • Achieving 274.2 mAh g −1 over 1000 cycles and high-rate performance up to 3.2 A g −1 . Transition metal selenides (TMSs) hold great promise as high-capacity cathode materials for rechargeable aluminum batteries (RABs) owing to their cost-effectiveness and favorable redox activity. However, their practical implementation is severely plagued by the structural collapse induced by volume expansion and the rapid capacity decay caused by polyselenide dissolution in acidic ionic liquid electrolytes. Herein, a dual-protection strategy is proposed by rationally constructing a hollow nitrogen-doped carbon nanotube-encapsulated Cu 2 Se/CoSe 2 heterostructure (NC@Cu 2 Se/CoSe 2 ), coupled with an acetylene black-modified separator (AB/GF/A). In this integrated architecture, the hollow conductive carbon skeleton physically confines the active species and buffers mechanical strain, while the bimetallic selenide heterojunction accelerates reaction kinetics. Synergistically, the functionalized separator further suppresses the shuttle effect by intercepting dissolved species. Benefiting from these multidimensional merits, the assembled RABs manifest superior electrochemical performance, delivering a high reversible capacity of 274.2 mAh g −1 after 1000 cycles at 1.0 A g −1 , and 250 mAh g −1 at a high rate of 3.2 A g −1 . This work offers a comprehensive perspective on integrating heterostructure engineering with separator modification to unlock the potential of advanced RABs. Download: Download high-res image (197KB) Download: Download full-size image A hollow N-doped carbon-encapsulated Cu 2 Se/CoSe 2 heterostructure is developed as a high-capacity cathode for rechargeable aluminum batteries. The integrated design, featuring an internal bimetallic selenide heterojunction and an acetylene black-modified separator, effectively buffers volume expansion and suppresses the shuttle effect of dissolved species, enabling exceptional cycling stability and rate capability.
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高影响因子
CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Fei Wang,Xing Wang,Siwei Li,Qisen Yang,Haibo Mu,Jinyao Li,Yu Yang
Severe skin damage resulting from acute trauma is often accompanied by uncontrolled bleeding, microbial infections, and delayed wound healing. Herein, multifunctional sprayable hydrogels (CT-CS-ZIF@CIP Gel) were developed for wound management by incorporating antibacterial nanoplatforms (CT-CS-ZIF@CIP) into photocurable gels consisting of chitosan methacrylate and gallic acid grafted gelatin. The nanoplatform was initially constructed by sequentially loading Cu 2 Se (CS) and ciprofloxacin-decorated zeolitic imidazolate framework-8 (ZIF@CIP) onto Cu-doped Ti MOF (CT), in which CS served as a photothermal agent, ZIF enabled pH-responsive release of CIP, and CT acted as carriers for CS and ZIF@CIP. The hydrogel precursor can be sprayed onto wound surface and photocured quickly, allowing hydrogel to fit the wound shape and form a protective barrier onsite. The resultant hydrogel exhibited excellent hemostatic ability, adhesion properties, cytocompatibility and toxin adsorption capacity. By integrating CS for short-term photothermal therapy with CIP for long-acting chemotherapy, the CT-CS-ZIF@CIP Gel demonstrated 100 % sterilization of three bacterial strains. Furthermore, moderate release of zinc and copper ions promoted wound healing. The therapeutic efficacy of hydrogel was validated in an infected cutaneous mouse model. Overall, this work presents a versatile sprayable hydrogel that can be flexibly applied to irregular dynamic wounds for safe and effective wound management.
研究领域:
生物医学工程
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材料科学
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伤口管理
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药剂学
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纳米技术
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DOI
PubMed
高影响因子
Acta Biomaterialia
·
2023
·
IF 9.7
Xiaoli Feng,Tian Lin,Dong Chen,Zhiyang Li,Qiuping Yang,Huiting Tian,Yao Xiao,Mingzhen Lin,Min Liang,Weihong Guo,Peng Zhao,Zhaoze Guo
Chemodynamic therapy (CDT) can effectively induce immunogenic cell death (ICD) in tumours and is thus a promising strategy for boosting the efficacy of immunotherapy. However, the mechanism by which CDT enhances ICD and lowers ICD efficiency is unknown and this restricts its clinical application. In this study, a second near-infrared (NIR-II) window irradiation-triggered hydrogen peroxide (H 2 O 2 ) self-supplying nanocomposite ((Cu 2 Se-CaO 2 )@LA) was constructed. The modified lauric acid was melted by the heat energy of the NIR-II irradiation, to expose the CaO 2 nanoparticles, and they then reacted with water to produce H 2 O 2 and Ca 2+ . H 2 O 2 was then converted to hydroxyl radicals by the photothermal-enhanced CDT process of the Cu 2 Se nanocubes. Notably, the CDT and Ca 2+ overload was found to induce sequential damage to the mitochondria and endoplasmic reticulum (ER), which upregulated the PERK-mediated eIF2α phosphorylation pathway and caused subsequent ICD. NIR-II irradiation of the (Cu 2 Se-CaO 2 )@LA also increased reactive oxygen species (ROS) formation and this was sufficient to increase dendritic cell maturation, attracting cytotoxic T lymphocytes, and suppressing tumour growth in vivo. Overall, we demonstrated that an enhanced CDT strategy under NIR-II exposure and H 2 O 2 self-supply can induce extensive ICD by inducing mitochondria-associated ER stress, which represents a highly effective and promising strategy for ICD amplification and tumour immunotherapy. Statement of significance In this study, a second near-infrared window (NIR-II) irradiation-triggered and H 2 O 2 self-supplying nanocomposite (named (Cu 2 Se-CaO 2 )@LA) was constructed and tested both in vitro and in vivo . These nanoparticles demonstrated promising antitumor activity as designed. Mechanistically, the nanoparticles could damage mitochondria and upregulate the PERK-mediated eIF2αphosphorylation pathway, further causing endoplasmic reticulum stress, and inducing immunogenic cell death through dendritic cell maturation and cytotoxic T lymphocyte recruitment augmented activity. This system represents a highly effective and promising strategy for enhancing tumor immunotherapy and provides new insights for future studies and design refinements.
研究领域:
癌症研究
·
免疫治疗
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纳米技术
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细胞生物学
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分子生物学
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）