MOLECULES
·
2023
·Vol. 28
·期 16
·5988
·
IF 4.6
Li Fan,Hongliang Zhu,Kaili Wang,Hao Liu,Weina Hu,Xin Xu,Shancheng Yan
Treatment of organic wastewater is still a difficult problem to solve. In this paper, Cu-doped SnSe powder was synthesized by a convenient and efficient hydrothermal method. Meanwhile, the degradation effect of different doping concentrations of SnSe on methylene blue was investigated. It was found that at low doping concentrations, the degradation effect on methylene blue was not obvious because Cu was dissolved in the lattice of the SnSe matrix at low concentrations. As the doping concentration increased, SnSe changed from a layered structure to a nanocluster structure with reduced particle size, and a mixed phase of SnSe and Cu2SnSe4appeared. In fact, the degradation effect on methylene blue was significantly enhanced, and we found that the catalytic degradation effect on methylene blue was best at a doping concentration of 10 wt.%.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2020
·Vol. 26
·期 17
·3870-3876
·
IF 4.857
Xiaoshan Wang,Yao Liu,Jie Dai,Qian Chen,Xiao Huang,Wei Huang
Graphical By taking advantage of the crystal phase dependent electronic property of SnSe x based materials, SnSe( x %)/SnSe 2 (100− x %) p–n heterostructures were synthesized via a facile one-step colloidal method, and the SnSe(50 %)/SnSe 2 (50 %) based sensor exhibited much improved sensing performance due to the formation of p–n hetero-junctions. The formation of semiconductor heterostructures is an effective approach to achieve high performance in electrical gas sensing. However, such heterostructures are usually prepared via multi-step procedures. In this contribution, by taking advantage of the crystal phase-dependent electronic property of SnSe x based materials, we report a one-step colloid method for the preparation of SnSe( x %)/SnSe 2 (100− x %) p–n heterostructures, with x ≈30, 50, and 70. The obtained materials with solution processability were successfully fabricated into NO 2 sensors. Among them, the SnSe(50 %)/SnSe 2 (50 %) based sensor with an active layer thickness of 2 μm exhibited the highest sensitivity to NO 2 (30 % at 0.1 ppm) with a limit of detection (LOD) down to 69 ppb at room temperature (25 °C). This was mainly attributed to the formation of p–n junctions that allowed for gas-induced modification of the junction barriers. Under 405 nm laser illumination, the sensor performance was further enhanced, exhibiting a 3.5 times increased response toward 0.1 ppm NO 2 , along with a recovery time of 4.6 min.
研究领域:
材料科学
·
化学传感器
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纳米技术
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Lijie Shi,Jun Ding,Xiangbin Chen,Xiang Qu,Zhiquan Chen,Man Jiang
Low-cost preparation of thermoelectric materials is crucial for reducing energy consumption. In this study, we prepared the nanopolycrystalline SnSe ceramic by combining the hydrothermal and cold sintering process (CSP) at a relatively low temperature of 170 °C from 300 MPa to 510 MPa. XRD analyses indicated that a pronounced preferential orientation of the cold sintered SnSe along the (h00) directions. SEM observations showed that a well-crystallized layered structure was formed. All SnSe samples exhibit remarkably low thermal conductivity of 0.3 Wm −1 K −1 at 773 K. This low thermal conductivity can be attributed to the use of ethanol as a transient liquid phase and the application of high pressure, which promotes the rearrangement of nanopolycrystals and introduces high densities of dislocations and stacking faults in SnSe. A maximum ZT value of 1.35 at 773 K was achieved for the 405 MPa sintered sample. This study provides a cost-effective and efficient strategy for the preparation of polycrystalline SnSe thermoelectric material.
研究领域:
材料科学
·
能源材料
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产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Hongxia Liu,Shun Zhang,Yan Zhang,Shuotong Zong,Wang Li,Can Zhu,Feng Luo,Jian Wang,Zhigang Sun
SnSe is a promising medium-temperature thermoelectric material due to its extremely low thermal conductivity and tunable electronic transport properties. In this work, n-type SnSe0.95 polycrystals doped with CeCl3 are synthesized by a melting method combined with a spark plasma sintering (SPS) process. The samples have highly textured structures and anisotropic thermoelectric properties. CeCl3 doping has a favorable effect on the electronic transport above 473 K, which may benefit from the excitation of the introduced impurity energy level. Moreover, the thermal conductivity is significantly reduced due to the phonon scattering by point defects. Finally, a peak ZT value of 1.17 is obtained at 773 K in SnSe0.95–0.5 mol % CeCl3, which paves the way for improving the thermoelectric performance of n-type SnSe via rare-earth halide doping.
研究领域:
材料科学
·
热电材料
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产品关联
DOI
高影响因子
Materials Today Energy
·
2022
·
IF 9.257
Hong Zhang,Yao Chen,Xiaofang Liu,Hengyang Wang,Chengzhi Niu,Sikang Zheng,Bin Zhang,Xu Lu,Guoyu Wang,Guang Han,Xiaoyuan Zhou
SnSe-based materials, comprising nontoxic, eco-friendly and abundant elements, have intrinsically low lattice thermal conductivity , which are promising candidates for thermoelectric conversion. However, unmodified, polycrystalline SnSe reveals poor electrical transport properties due to the lower carrier mobility . Herein, two-dimensional Ti 3 C 2 T x MXene has been incorporated into SnSe matrix by solution synthesis and fast consolidation, which efficiently increases the carrier mobility and concentration; accordingly, the electrical conductivity is improved in the temperature range of 323–523 K. Meanwhile, SnSe/Ti 3 C 2 T x composites achieve diminished lattice thermal conductivity, delivering a low value of 0.41 W m −1 K −1 at 773 K. Ultimately, a peak zT of 0.93 at 773 K is attained in SnSe/Ti 3 C 2 T x composite with addition of 0.3 wt% Ti 3 C 2 T x , representing a 66% increase compared to that of SnSe. This work sheds light on the thermoelectric performance improvement of polycrystalline SnSe by controllably incorporating two-dimensional MXene.
研究领域:
材料科学
·
能源转换技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2021
·
IF 15.881
Xunuo Lou,Shuang Li,Xiang Chen,Qingtang Zhang,Houquan Deng,Jian Zhang,Di Li,Xuemei Zhang,Yongsheng Zhang,Haibo Zeng,Guodong Tang
Polycrystalline SnSe materials with ZT values comparable to those of SnSe crystals are greatly desired due to facile processing, machinability, and scale-up application. Here manipulating interatomic force by harnessing lattice strains was proposed for achieving significantly reduced lattice thermal conductivity in polycrystalline SnSe. Large static lattice strain created by lattice dislocations and stacking faults causes an effective shortening in phonon relaxation time, resulting in ultralow lattice thermal conductivity. A combination of band convergence and resonance levels induced by Ga incorporation contribute to a sharp increase of Seebeck coefficient and power factor. These lead to a high thermoelectric performance ZT ∼ 2.2, which is a record high ZT reported so far for solution-processed SnSe polycrystals. Besides the high peak ZT, a high average ZT of 0.72 and outstanding thermoelectric conversion efficiency of 12.4% were achieved by adopting nontoxic element doping, highlighting great potential for power generation application at intermediate temperatures. Engineering lattice strain to achieve ultralow lattice thermal conductivity with the aid of band convergence and resonance levels provides a great opportunity for designing prospective thermoelectrics.
研究领域:
材料科学
·
热电材料
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能源转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
JongGuk Kim,HuiGwang Yun,KukChol Ri,JingYu Sun,HyoYong Kim,Lu Liu
Today, developing photocatalysts with high sterilization efficiency is still an urgent challenge. Currently photothermal therapy (PTT) and photodynamic therapy (PDT) are known as a promising candidate for eradicating bacteria because of strong reactivity, non-specific attack characteristics and minimal invasiveness . Therefore, the synergic effect of PTT and PDT can shorten the antibacterial time, increase the antibacterial rate, and reduce antibacterial agent dosage. Herein, SnSe samples with sphere, rod, plate, and surface wrinkled morphology were synthesized by a simple solvothermal method. The samples were denoted as SnSe-1, SnSe-2, SnSe-3, and SnSe-4, respectively. The morphology and size of the prepared samples greatly relied on the selection of surfactant and the reaction time. In addition, the size and morphological changes affected the photothermal properties and photodynamic properties of the prepared samples. Among the prepared samples, SnSe-1 showed the best photothermal effect (41.4%) and reactive oxygen species generating ability during the 808 nm laser irradiation. Consequently, SnSe-1 exhibited sterilization rates of 99.99% against Gram-negative Escherichia coli (E. coli) and Gram-positive Bacillus subtilis (B. subtilis) during NIR irradiation (1.5 W/cm 2 ， 10 min) at a relatively low concentration (25 µg/mL). The result suggests that SnSe-1 nanoparticle with a spherical shape could be used as an effective antibacterial agent for the treatment of bacterial contamination, including rapid bacterial sterilization in water.
研究领域:
材料科学
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微生物学
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医学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 30
·10333-10341
·
IF 7.059
Jiaqi Sheng,Xiaofang Liu,Chengzhi Niu,Yufeng Sun,Yao Chen,Hengyang Wang,Bin Zhang,Guoyu Wang,Xiaoyuan Zhou,Guang Han
Bottom-up solution synthesis has been considered as a facile and energy-efficient approach for SnSe thermoelectric materials. Herein, we report a microwave-assisted hydrothermal method for the fast and controllable synthesis of SnSe with optimised thermoelectric properties. The NaOH concentration in solution precursors was demonstrated as a key factor influencing the phase composition, diameter, and morphology of the hydrothermal products as well as the thermoelectric properties of the corresponding sintered pellets. It is found that a NaOH : SnCl2 molar ratio of 30 leads to the formation of phase-pure SnSe microrods, and the pellet constructed from these rods obtains a maximum ZT of 1.08 and 0.78 at 773 K in parallel and perpendicular alignments to the pressing direction, respectively. These ZT values are significantly higher than the ZT value achieved by the pellet that was sintered from the hydrothermal powders prepared without NaOH and comprised the mixed phases of SnSe, SnO2, and SnSe2. This enhancement is primarily due to the improved power factor together with the lower lattice thermal conductivity owing to the significantly reduced fraction of SnO2 in the pellet. This study not only provides a microwave-assisted solution strategy for the fast, efficient, and controllable synthesis of SnSe materials, but also identifies the key synthesis parameters for securing better thermoelectric performance.
研究领域:
材料科学
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能源材料
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热电材料
✓ 已验证
DOI
高影响因子
RARE METALS
·
2017
·Vol. 37
·期 4
·333-342
·
IF 1.189
Feng Dan,Chen Yue-Xing,Fu Liang-Wei,Li Ju,He Jia-Qing
Earth-abundant IV–VI semiconductor SnSe is regarded as a promising thermoelectric material due to its intrinsic low thermal conductivity. In this report, the highly textured SnSe/Ag 2 Se composites were first designed by solid solution method followed by spark plasma sintering (SPS) and their thermoelectric properties in two directions were investigated, and then, the performance of composites was further optimized with an additional ball milling. The coexistence of SnSe and Ag 2 Se phases is clearly confirmed by energy-dispersive X-ray spectroscopy (EDX) in transmission electron microscopy (TEM). After ball milling, the size of SnSe grains as well as the incorporated Ag 2 Se particles reduces effectively, which synergistically optimizes the electrical and thermal transport properties at high temperature range. As a result, a maximum ZT of ~ 0.74 at 773 K for SnSe + 1.0%Ag 2 Se in the direction vertical to the pressing direction is achieved. Composite engineering with additional ball milling is thus proved to be an efficient way to improve the thermoelectric properties of SnSe, and this strategy could be applicable to other thermoelectric systems. Graphical
研究领域:
材料科学
·
热电材料
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半导体物理
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纳米结构工程
·
能源材料
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Nan Xin,Yifei Li,Guihua Tang,Longyun Shen
High-efficient and environment-friendly thermoelectric materials have attracted much attention. The single crystal tin selenide (SnSe) has a record high thermoelectric figure of merit ( ZT ) of 2.6 at ~800 K. Polycrystalline SnSe has better mechanical-strength but inferior ZT values than the single crystal, attribute to the paradoxically higher thermal conductivity ( κ ). In this work, we synthesized K x Sn 1−x Se (x = 0, 0.01, 0.02, 0.03 and 0.04) by doping K 2 CO 3 . A large number of point defects and dislocations generated with CO 2 volatilization, which possibly reduces κ . Based on this process, the K x Sn 1−x Se powders were followed by the hydrogen reduction with 4% H 2 − 96% Ar atmosphere to reduce tin oxide and potassium oxide which have high κ . These strategies lead to an ultra-low κ 0.32 Wm −1 K −1 in K 0.03 Sn 0.97 Se at 798 K. The effects of K doping on electronic transport performance of SnSe were studied by density functional theory calculation and experimental measurement. Doing K can narrow the band gap, increase hole concentration and enhance the electrical conductivity ( σ ) of SnSe. At 298 K, the σ of K x Sn 1−x Se increased by more than 2.5 times compared with the pristine SnSe. In high temperature region (623 K< T < 823 K), the σ is mainly affected by thermal excitation. High doping level of K (x = 0.03 and 0.04) suppresses the thermal excitation and limits the maximum of ZT . As the result, A high ZT of 1.06 is obtained at 798 K from K 0.01 Sn 0.99 Se perpendicular to the pressing direction, which is 103.8% larger than that of pristine SnSe. In addition, the hot-pressing polycrystalline K x Sn 1−x Se remains obvious lamellar morphology and show anisotropy. The σ and κ of K x Sn 1−x Se samples perpendicular to the pressure direction are much higher than those of the samples parallel to the pressure direction. This anisotropy decreases with the increasing K content.
研究领域:
材料科学
·
能源科学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Ze Li,Wen-Jie Li,Jun Guo,Zi-Yuan Wang,Xing Yang,Yu-Ke Zhu,Tian-En Shi,Yi-Xin Zhang,Jing Feng,Zhen-Hua Ge
SnSe materials have attracted extensive attention in thermoelectrics due to their low thermal conductivity. Nevertheless, the thermoelectric properties of n-type polycrystalline SnSe are still low, and metallic Sn distributed in the SnSe1–x materials would affect the repeatability of thermoelectric performance. Herein, the thermoelectric properties of n-type polycrystalline SnSe0.95-based composites are highly enhanced by heterogeneous Cu doping. The carrier concentration of the SnSe0.95 material was optimized by SnCl2 doping. The strategy of heterogeneous Cu doping is employed in further improving the thermoelectric performance of the SnCl2-doped SnSe0.95 materials. In addition, partial Cu+ doping tunes the electron concentration to enhance the Seebeck coefficient. Moreover, metallic Sn distributed along the grain boundaries can be stabilized by forming Cu6Sn5 alloys, which improve the thermal stability of bulk composites. Excessive Cu particles and SnCl2 precipitates strengthen phonon scattering for lowering the lattice thermal conductivity. Ultimately, a peak ZT of 1.55 is yielded at 773 K in the SnSe0.95–1 wt % SnCl2–1 wt % Cu bulk composite, whose mechanical hardness is also increased. Hence, these results promote a feasible approach to simultaneously enhance the thermoelectric and mechanical properties of n-type SnSe-based composites, which might be worth exploring in other thermoelectric materials.
研究领域:
材料科学
·
热电学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Weimeng Zheng,Zhongyue Zhang,Nannan Liu,Qingyu Li,Jianbo Sun
The construction of heterogeneous structures could boost the performance of materials in gas sensing applications since the interface may enhance charge transfer. However, appropriate design and containable synthesis methods of heterogeneous structures with high-quality interfaces remain challenging. In this paper, heterolayered SnO2/SnSe nanosheet composites were prepared by regulating the alkali concentration to control the self-assembly rates of SnSe nanosheets while forming defect point oxidation. Heterolayered SnO2/SnSe nanosheets were synthesized by a one-step hydrothermal method and then used as a highly sensitive sensor for the detection of NO2 at room temperature. The as-obtained SnO2/SnSe materials were characterized using scanning electron microscopy, X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, and I–V polarization to analyze the relationships between the heterogeneous structural morphology, crystallography, chemical components, electrical properties, and sensitivity mechanism. The results showed that the SnO2/SnSe-0.4 sample was prepared by the one-step hydrothermal method at the NaOH concentration of 0.04 mol/L. The SnO2/SnSe-0.4 sensor showed great sensitivity and higher selectivity to 1 ppm NO2 (resistance ratio = 7.8) at room temperature, roughly 7.1 and 2.7 times higher than that of pure SnSe and SnO2, respectively. In addition, the sensor exhibited a lower detection limit of 0.1 ppm. The improved sensing performance could be attributed to the large number of P–N heterojunctions of the SnO2/SnSe-0.4 material, enhanced interface charge transfer, and increased defect point oxidation in the material surface. The experimental results showed that SnO2/SnSe-0.4 is a very promising room-temperature NO2 gas sensing material, providing guidance for the rational design of heterogeneous structural sensors.
研究领域:
材料科学
·
传感器技术
·
纳米材料
✓ 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）