ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Qingyang Jian,Yaru Gong,Chen Chen,Rongxin Sun,Song Zhao,Tao Shen,Qingtang Zhang,Yang Geng,Yanan Li,Wei Dou,Congmin Liang,Yuqi Liu,Deshang Xiang,Pan Ying,Guodong Tang
Cu2Se has emerged as a promising thermoelectric material due to its low lattice thermal conductivity, high Seebeck coefficient, and high peak figure of merit (ZT) at elevated temperatures. However, its performance is limited by a high intrinsic carrier concentration and low carrier mobility. In this work, we investigate Cu2Se-based composites to overcome these challenges by introducing GeTe as compound phase to optimize carrier concentration, enhance mobility, and promote phonon scattering. The incorporation of GeTe significantly optimized both carrier concentration and mobility, with the Cu2Se/5 wt % GeTe composite exhibiting a carrier mobility of 30.8 cm2·V–1·s–1, more than twice that of pristine Cu2Se (11.4 cm2·V–1·s–1). Additionally, the inclusion of GeTe substantially reduced both the electrical and lattice thermal conductivity across the entire temperature range. These improvements culminated in a peak ZT of 2.2 at 923 K for the Cu2Se/10 wt % GeTe composite. These findings underscore the effectiveness of utilizing high-performance thermoelectric materials, such as GeTe, as secondary phases to substantially boost the thermoelectric properties of Cu2Se. This approach offers a promising pathway for the development of advanced thermoelectric materials for energy conversion applications.
研究领域:
材料科学
·
能源转换技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Jie Chen,Deyu Bao,Qiang Sun,Wei-Di Liu,Can Liu,Jun Tang,Lei Yang,Dali Zhou,Matthew S. Dargusch,Zhi-Gang Chen
To achieve the optimized performance and the widespread application of thermoelectric materials , it is crucial to decouple the highly interrelated thermoelectric parameters of materials. In this study, we illustrate that phonon and carrier transport properties of n-type Bi 2 Te 3 -based composites can be simultaneously optimized through alloying Cu 2 Se. Owing to the chemical reactions between the Bi 2 Te 3 matrix and the Cu 2 Se additives during the sample preparation, the carrier concentration and density-of-states effective mass can be tuned to optimize the carrier transport properties, while the lattice thermal conductivity can be reduced by introducing hierarchical structures including point defects , Cu 7 Te 5 inclusions, phase boundaries and localized Te-deficient regions. As a result, an enhanced thermoelectric performance is achieved compared with pristine Bi 2 Te 3 . Our study indicates the alloying Cu 2 Se can synergistically control the thermoelectric properties of Bi 2 Te 3 .
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Yao Lu,Yufei Ding,Yang Qiu,Kefeng Cai,Qin Yao,Haijun Song,Liang Tong,Jiaqing He,Lidong Chen
Herein, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) coated CuxSey (PC-CuxSey) nanowires are prepared by a wet-chemical method, and PEDOT:PSS/CuxSey nanocomposite films on flexible nylon membrane are fabricated by vacuum assisted filtration and then cold-pressing. XRD analysis reveals that the CuxSey with different compositions can be obtained by adjusting the nominal Cu/Se molar ratios of their sources. For the composite film starting from a Cu/Se nominal molar ratio of 3, an optimized power factor of ∼270.3 μW/mK2 is obtained at 300 K. Moreover, the film exhibits a superior flexibility with 85% of the original power factor retention after bending for 1000 cycles around a rod with a diameter of 5 mm. TEM and STEM observations of the focused ion beam (FIB) prepared sample reveal that it is mainly attributed to a synergetic effect of the nylon membrane and the composite film with nanoporous structure formed by the intertwined nanowires, besides the intrinsic flexibility of nylon. Finally, a thermoelectric prototype composed of nine legs of the optimized hybrid film generates a voltage and a maximum power of 15 mV and 320 nW, respectively, at a temperature gradient of 30 K. This work offers an effective approach for high TE performance inorganic/polymer composite film for flexible TE devices.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2020
·Vol. 12
·期 39
·20536-20542
·
IF 6.895
Jie Chen,Taoyi Liu,Deyu Bao,Bin Zhang,Guang Han,Can Liu,Jun Tang,Dali Zhou,Lei Yang,Zhi-Gang Chen
Searching for new-type, eco-friendly, and Earth-abundant thermoelectric materials, which can be used as an alternative to the high-cost bismuth telluride, is important for near-room-temperature applications. In this work, nanostructured monoclinic Cu2Se with a low carrier concentration has been synthesized by a wet mechanical alloying process combined with spark plasma sintering. Such a low carrier concentration, which originates from the effectively suppressed Cu deficiencies during the fabrication process, induces a relatively low electrical conductivity and carrier thermal conductivity. Besides, the nanostructured grains combined with point defects and phonon resonance enhance the phonon scattering to induce a low lattice thermal conductivity without sacrificing the electrical transport properties. As a result, our nanostructured monoclinic Cu2Se obtains a figure of merit of 0.72 at 380 K with good thermal stability. This work indicates that nanostructured monoclinic Cu2Se is a promising near-room-temperature thermoelectric material.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Wang-Wei Liao,Lei Yang,Jie Chen,Da-Li Zhou,Xian-lin Qu,Kun Zheng,Guang Han,Jia-Bei Zhou,Min Hong,Zhi-Gang Chen
Copper selenide (Cu 2 Se) has been extensively studied as an eco-friendly thermoelectric candidate owing to the outstanding thermoelectric performance of its high-temperature β-phase. In this study, we propose that α-Cu 2 Se is also a promising thermoelectric material at near-room-temperature. We synthesize nanostructured Cu 2-x Se via a facile solvothermal method, and densify the samples using Spark Plasma Sintering to maintain the small grain sizes. Although the as-prepared α-Cu 2 Se has intrinsically low lattice thermal conductivity , its high Cu deficiency leads to a high carrier concentration, therefore, a low thermoelectric performance. As an electron donor, bismuth can effectively compress the Cu vacancies of the as-prepared α-Cu 2 Se and in turn reduce its carrier concentration from 4.1 × 10 20 to 2.0 × 10 20 cm −3 at room temperature, achieving a significantly enhanced power factor and a reduced carrier thermal conductivity. Consequently, a zT of 0.43 at 373 K is obtained in Cu 1.982 Bi 0.006 Se, showing great potential in developing high-performance near-room-temperature α-Cu 2 Se-based thermoelectric materials.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Xiaoxu Yu,Hualei Yuan,Zhongben Pan,Han Pan,Hongwei Chu,Dechun Li
Recently, mid-infrared photonics has attracted tremendous attention for various applications. To address the dilemma of the limited variety of materials for mid-infrared photonics, the mid-infrared optical modulation characteristics of the porous nano-grained cuprous selenide (Cu 2 Se) were investigated for the first time. The large effective nonlinear absorption coefficient, large modulation depth, and low saturation absorption intensity at 2.3 μm indicate that the porous nano-grained Cu 2 Se were promising saturable absorbers for the generation of Q-switched pulsed laser in the mid-infrared regime. As an application, the Tm:GdVO 4 passively Q-switched laser operating on the 3 H 4 → 3 H 5 Tm 3+ transition was achieved for the first time by using the prepared porous nano-grained Cu 2 Se as the saturable absorber. The minimum pulse duration and the maximum repetition rate of the stable Q-switched pulse train were 440 ns and 76.9 kHz, respectively. Our results demonstrated that the porous nano-grained Cu 2 Se was a promising candidate for the mid-infrared photonic applications.
研究领域:
材料科学
·
光学工程
·
光子学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Hancheng Yuan,Nan Wang,Yanna NuLi,Jun Yang,Jiulin Wang
Based on a displacement reaction mechanism, Cu 2 Se is a good candidate for non-insertion-based cathode materials of rechargeable magnesium batteries . Nevertheless, its relatively low electronic conductivity leads to a poor rate capability and an unsatisfactory cycling performance. In this work, we firstly reported the improved electrochemical performance of Cu 2 Se cathode based on displacement reaction for Mg batteries triggered by a Li salt additive in a typical magnesium electrolyte 0.4 mol dm −3 (PhMgCl) 2 -AlCl 3 /THF. Cu 2 Se materials with different morphologies and particle sizes were synthesized by a solvothermal process and a hydrothermal method , respectively. Cu 2 Se with smaller particle sizes by the hydrothermal method exhibits a higher specific capacity (152.7 mAh g −1 first discharge capacity at 0.02 C) but poor cycling performance in 0.4 mol dm −3 (PhMgCl) 2 -AlCl 3 /THF electrolyte. LiCl was added in the magnesium electrolyte to promote the displacement reaction of the Cu 2 Se material. An initial discharge capacity of approximately 239.7 mAh g −1 with 48.4% capacity retention after 20 cycles at 0.1 C can be obtained for Cu 2 Se in 0.4 mol dm −3 (PhMgCl) 2 -AlCl 3 +1.0 mol dm −3 LiCl/THF electrolyte. Furthermore, the cycling performance and rate capability are enhanced by in situ homogeneously anchoring Cu 2 Se particles onto the surface of the reduced graphene oxide (rGO) nanosheets . Cu 2 Se/rGO composite with 10 wt% rGO exhibits 64.2% capacity retention after 20 cycles at 0.1 C, and a more than 120 mAh g −1 reversible capacity at 0.2 C in the hybrid Mg 2+ /Li + electrolyte.
研究领域:
材料科学
·
电化学
·
能源存储技术
✓ 已验证
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2019
·
IF 10.159
Xianwen Wang,Xiaoyan Zhong,Huali Lei,Yuehao Geng,Qi Zhao,Fei Gong,Zhijuan Yang,Ziliang Dong,Zhuang Liu,Liang Cheng
Tumor microenvironment (TME)-mediated cancer therapy, such as chemodynamic therapy (CDT) based on Fenton reaction, has attracted extensive attention in recent years. However, efficient Fenton reactions usually require stringent reaction conditions (low pH value and sufficient H2O2). Therefore, there is an urgent need to improve the efficiency of Fenton reaction within the tumor for enhanced CDT in cancer treatment. Herein, Cu2Se hollow nanocubes (HNCs) are successfully prepared via an anion exchange method using Cu2O nanocubes (NCs) as the template. This method is also successfully used to synthesize Cu2S or CuSSe HNCs with the similar structure. By tuning the reaction time in the process of transforming Cu2O NCs into Cu2Se HNCs, Cu2Se HNCs with optimized performances in high NIR II photothermal conversion efficiency (50.89%) and good Fenton-like properties are obtained. After surface coating, PEGylated Cu2Se HNCs show good water dispersibility and biocompatibility. Importantly, in vitro and in vivo experiments demonstrate the significant synergistic effect of combining photothermal therapy (PTT) and CDT based on PEG-Cu2Se HNCs, achieving greatly enhanced efficacy than that obtained by PTT or CDT alone. Moreover, such PEG-Cu2Se HNCs appear to be rather safe for treated animals without noticeable long-term toxicity.
研究领域:
生物医学工程
·
肿瘤治疗研究
·
纳米材料科学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2020
·Vol. 10
·期 2
·302
·
IF 4.324
Le Hu,Chaoqun Shang,Eser Metin Akinoglu,Xin Wang,Guofu Zhou
Cu2Se with high theoretical capacity and good electronic conductivity have attracted particular attention as anode materials for sodium ion batteries (SIBs). However, during electrochemical reactions, the large volume change of Cu2Se results in poor rate performance and cycling stability. To solve this issue, nanosized-Cu2Se is encapsulated in 1D nitrogen-doped carbon nanofibers (Cu2Se-NC) so that the unique structure of 1D carbon fiber network ensures a high contact area between the electrolyte and Cu2Se with a short Na+diffusion path and provides a protective matrix to accommodate the volume variation. The kinetic analysis and DNa+calculation indicates that the dominant contribution to the capacity is surface pseudocapacitance with fast Na+migration, which guarantees the favorable rate performance of Cu2Se-NC for SIBs.Keywords:sodium ion batteries;Cu2Se-NC;carbon nanofibers;rate capability;cycling stability
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Gangyong Li,Siping Li,Zhi Li,Chen Li,Zhaodi Wang,Huan Li,Rui Chen,Miao Zhou,Bao Zhang,Zhaohui Hou
Rechargeable aluminum batteries (RABs) are promising alternatives to lithium-ion batteries in large-scale energy storage applications owing to the abundance of their raw materials and high safety. However, achieving high energy density and long cycling life simultaneously holds great challenges for RABs, especially for high capacity transition metal selenide (TMS)-based positive materials suffering from structural collapse and dissolution in acidic ionic liquid electrolyte. Herein, Se-doped carbon encapsulated Cu 2 Se with yolk-shell structure (YS/Se-C@Cu 2 Se) is rationally constructed to address such issues. Electrochemical and spectroscopic analyses as well as density functional theory calculations show that the highly conductive Se–C shell enhances the electrochemical reaction kinetics of the electrode and provides strong adsorption for the soluble Cu and Se species. Benefiting from these merits, the optimal YS/Se-C@Cu 2 Se cathode manifests a high specific capacity of 1024.2 mAh/g at 0.2 A/g, a superior rate capability of 240.5 mAh/g at 3.2 A/g, and a long-term cycling stability over 2500 cycles. This work offers a feasible approach to the design and construction of low-cost and efficient TMS-based positive materials for realizing practically usable RABs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS & DESIGN
·
2023
·
IF 8.4
Nanping Zhong,Jianghao Xing,Jia He,Xinyu Zhao,Xianwen Wang,Haowei Xue
Oral squamous cell carcinoma (OSCC) produces malignant tumours in the oral cavity and adjacent anatomical structures, ranking sixth among the 11 most common malignant tumours in the body. The poor surgical outcomes for OSCC have led to increasing interest in nanomedicines. Major challenges with concentration-dependent therapies include the effective and precise delivery of gases to the lesion and combination with other therapies to achieve precise treatment. Herein, novel Cu 2 Se nanosheets (Cu 2 Se NSs) were ingeniously synthesized and enveloped with a thermosensitive nitric oxide (NO) supplier (sodium nitroprusside dihydrate, SNP) within a sodium alginate (ALG) hydrogel matrix to effectively eradicate tumours by combining photothermal therapy (PTT) and gas therapy (GT). The Cu 2 Se NSs reduced the glutathione (GSH) present in high concentrations to glutathione disulfide (GSSG), effectively killing squamous cell carcinoma cells under 1064 nm laser irradiation. Moreover, the Cu 2 Se NS hydrogel wrapped with SNP exhibited good NIR-controlled NO release behaviour, thus realizing the combined application of PTT and GT. PTT along with NO release is expected to improve the antitumour effect and provide new solutions for treating OSCC.
研究领域:
肿瘤学
·
纳米医学
·
生物材料学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Baodeng Yang,Jiao Yang,Zhi Huang,Lizhao Qin,Hua Lin,Qing Li
Thin Cu 2 Se hexagonal sheets (HSs) with large-size were obtained via a convenient green route by using Ascorbic acid (AC) as a reducing agent and β-CD as a surfactant. The crystal structure and optical properties of the Cu 2 Se HSs were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectrometer (XPS) and ultraviolet–visible spectrophotometer (UV–Vis). An NTH (Nucleation-Triangle-Hexagonal) mechanism for the formation of the Cu 2 Se hexagonal sheets was proposed. The final morphology of the Cu 2 Se HSs was determined by both β-CD and the growth rates of different crystal planes. The as-prepared Cu 2 Se HSs show good photocatalytic performance on degrading of Methylene blue (MB) under visible light.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）