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Ag掺杂多晶snse基热电材料的性能研究

现代技术陶瓷 2024年第1期45卷 177-187页

作者：鲁文彬罗维范宇驰丁奇江莞东华大学材料科学与工程学院上海201620 东华大学功能材料研究中心上海201620

近年来,由于环境污染与能源危机的日益严重,使得国内外学者对可再生能源的研究越发重视,热电材料因其能够实现电与热的直接转换而引起了广泛关注。但热电器件的转换效率较低限制了其实际应用,为了提高其转换效率,大部分研究工作都聚焦... 详细信息

近年来,由于环境污染与能源危机的日益严重,使得国内外学者对可再生能源的研究越发重视,热电材料因其能够实现电与热的直接转换而引起了广泛关注。但热电器件的转换效率较低限制了其实际应用,为了提高其转换效率,大部分研究工作都聚焦于提高热电材料的热电优值(ZT)上。snse是目前性能优良的中温热电材料,本文通过水热法和在低于传统烧结温度的条件下成功制备了Ag掺杂的多晶AgxSn_(1-x)Se(x=0.0025、0.005、0.0075)热电材料。结果表明,Ag的掺入明显改善了材料的载流子浓度,同时样品保持了较高的Seebeck系数,使得材料的电学性能显著提高。当x=0.0075时,Ag_(0.0075)Sn_(0.9925)Se具有相对较高的ZT值,800K时可达1.2,但是对该样品进行退火处理后ZT值有所降低,800 K时约为0.8。

关键词： snse Ag掺杂热电材料 ZT值

Attaining enhanced thermoelectric performance in p-type(snse)1–x(SnS2)x produced via sintering their solution-synthesized micro/nanostructures

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Journal of Materials Science & Technology 2022年第25期120卷 205-213页

作者： Xiaofang Liu Hengyang Wang Bin Zhang Sikang Zheng Yao Chen Hong Zhang Xianhua Chen Guoyu Wang Xiaoyuan Zhou Guang Han College of Materials Science and Engineering Chongqing UniversityChongqing400044China National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing400044China Analytical and Testing Center Chongqing UniversityChongqing401331China College of Physics Chongqing UniversityChongqing401331China Chongqing Institute of Green and Intelligent Technology Chinese Academy of SciencesChongqing400714China

snse,possessing strong lattice anharmonicity and structural anisotropy,has attracted massive attention in thermoelectric conversion.Herein,we demonstrate that simultaneously optimized electrical and thermal transport properties are achieved in SnS_(2) -alloyed snse polycrystalline materials,which were fabricated via sintering the mixture of solution-synthesized snse microplates and SnS_(2) nanoplates.Resulting from the increased carrier concentration,p-type(snse)_(1–x)(SnS_(2))_(x)(x=0.5%,1%)samples obtain muchimproved power factor between 300 K and 373 K,e.g.0.72 mW m^(–1)K^(–2)at 300 K for(snse)0.99(SnS_(2) )0.01,which is enhanced by 53%compared to that of snse.Additionally,the existing point defects and planar defects effectively strengthen phonon scattering,thus reducing the lattice thermal conductivity,for example,0.47 W m^(–1) K^(–1) at 773 K for the x=0.02 sample.Eventually,a maximum zT of 0.80 at 823 K and an average zT of 0.52 over 300–823 K are obtained in the(snse)0.99(SnS_(2))0.01 sample,which are increased by 33%and 45%compared to those of snse,respectively.This study demonstrates a secondary phase alloying strategy to synergistically optimize the electrical and thermal properties of polycrystalline snse.

关键词： Thermoelectric snse SnS2 Solvothermal synthesis Lattice thermal conductivity

Extremely Anisotropic Thermoelectric Properties of snse Under Pressure

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Energy & Environmental Materials 2023年第3期6卷 58-65页

作者： Wei Cao Ziyu Wang Ling Miao Jing Shi Rui Xiong Key Laboratory of Artificial Micro-and Nano-structures of Ministry of Education School of Physics and TechnologyWuhan UniversityWuhan 430072China The Institute of Technological Sciences Wuhan UniversityWuhan 430072China Suzhou Institute of Wuhan University Suzhou 215123China School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China

snse has attracted extensive attention due to its ultralow thermal conductivity and excellent thermoelectric properties.In this work,pressure-induced thermoelectric properties of Pnma snse are investigated via first-principles calculations.We uncover distinct energy isosurfaces topology transition of conduction band by applying pressure.The newly created conduction band valley caused by pressure has a distinct anisotropic shape compared to the old one.Inducing pressure can greatly enhance the anisotropy of electronic transport properties of the n-type Pnma snse.Furthermore,the lattice thermal conductivity also exhibits anisotropic behavior under pressure due to a special collaged phonon mode.The pressure-induced lattice thermal conductivity along the a-axis shows a slower growth trend than that along the b-axis and c-axis.The optimal ZT value of the n-type Pnma snse along the a-axis can reach 1.64 at room temperature.These results would be helpful for designing the Pnma snse-based materials for the potential thermoelectric and valleytronic applications.

关键词： first-principles calculations pressure snse thermoelectric materials

Pomegranate-inspired porous snse/ZnSe@C anode:A stress-buffer nanostructure for fast and ultrastable sodium-ion storage

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Journal of Energy Chemistry 2022年第12期75卷 369-377,I0010页

作者： Zhixin Liang Qinghua Li Wang Zhang Dandan Yu Wei Zhang Jiawei Wu Gaoyu Wang Wenbo Fan Junling Wang Shaoming Huang School of Materials and Energy Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage DevicesGuangdong University of TechnologyGuangzhou 510006GuangdongChina College of Materials Science and Engineering Shenzhen UniversityShenzhen 518055GuangdongChina College of Materials and Chemistry China Jiliang UniversityHangzhou 310018ZhejiangChina

Tin selenide(snse)is considered as a potential anode for sodium-ion batteries(SIBs)owing to its high theoretical specific capacity.Unfortunately,it suffers from drastic volume expansion/contraction during sodium ions insertion/extraction,resulting in poor cycling stability.Herein,a pomegranate-inspired porous carbon shell wrapped heterogeneous snse/ZnSe composite(snse/ZnSe@C)is exquisitely designed and fabricated through electrostatic spraying followed by high-temperature selenization.The polyacrylonitrile-derived carbon shell acts as an adhesive to link the porous cubic snse/ZnSe and form highly interconnected microcircuits to improve the electron/ion transfer efficiency and inhibit the bulk volume change of internal metallic selenide nanoparticles and polyselenides dissolution during repeated cycling.Moreover,the abundant heterostructure interface of snse/ZnSe further significantly accelerates the electrons/ions transport.As a result,the as-prepared snse/ZnSe@C electrode exhibits a high specific capacity(508.3 m Ah g^(-1)at 0.05 A g^(-1)),excellent rate performance(177.8 m Ah g^(-1)at 10.0 A g^(-1)),and remarkable cycling stability(195.9 m Ah g^(-1)after 10,000 cycles at 5.0 A g^(-1)).Furthermore,in-situ Xray diffraction(XRD)/Raman,ex-situ transmission electron microscopy,and kinetic analysis clearly reveal a four-step electrochemical reaction process and battery-capacitor dual-mode sodium storage mechanism.This work provides a new perspective for developing commercial SIBs anode materials with high capacity and long lifespan.

关键词： snse Electrostatic spraying Carbon armor Superior cycling stability Sodium-ion batteries Sodiation mechanism

High thermoelectric and mechanical performance in the n-type polycrystalline snse incorporated with multi-walled carbon nanotubes

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Journal of Materials Science & Technology 2022年第19期114卷 55-61页

作者： Xin-Yu Mao Xiao-Lei Shi Liang-Chuang Zhai Wei-Di Liu Yue-Xing Chen Han Gao Meng Li De-Zhuang Wang Hao Wu Zhuang-Hao Zheng Yi-Feng Wang Qingfeng Liu Zhi-Gang Chen State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 211816China Centre for Future Materials University of Southern QueenslandSpringfield CentralBrisbane4300Australia School of Chemistry and Physics Queensland University of TechnologyBrisbaneQLD 4000Australia Australian Institute for Bioengineering and Nanotechnology The University of QueenslandBrisbaneQLD 4072Australia Shenzhen Key Laboratory of Advanced Thin Films and Applications Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China Key Laboratory of Material Physics of Ministry of Education School of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China School of Mechanical and Mining Engineering The University of QueenslandSt LuciaBrisbaneQLD 4072Australia College of Materials Science and Engineering Nanjing Tech UniversityNanjing 211816China Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites Nanjing Tech UniversityNanjing 211816China CAS Key Laboratory of Carbon Materials Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001China

In this study,we introduce multi-walled carbon nanotubes(MWCNTs)in Pb/I co-doped n-type polycrys-tal snse to simultaneously improve its thermoelectric and mechanical properties for the first time.The introduced MWCNTs act as the“bridges”to accelerate the electron carrier transport between snse grains,leading to significantly increased electrical conductivity from 32.6 to 45.7 S cm^(−1) at 773 K,which con-tributes to an enhanced power factor of∼5.0μW cm^(−1) K^(−2) at this temperature.Although MWCNTs possess high intrinsic thermal conductivities,these MWCNTs,acting as nanoinclusions in the snse matrix to form the dense interfaces between snse and MWCNTs,provide extra heat-carrying phonon scattering centers,leading to a slightly reduced lattice thermal conductivity of only 0.34 W m^(−1) K^(−2) at 773 K and in turn,a high ZT of∼1.0 at this temperature.Furthermore,the introduced MWCNTs can simultane-ously act as the“binders”to bond adjacent grains,significantly improving the mechanical properties of snse by boosting its Vickers hardness from 39.5 to 50.5.This work indicates that our facile approach can achieve high thermoelectric and mechanical properties in n-type snse polycrystals with a considerable potential for applying to thermoelectric devices as n-type elements.

关键词： Thermoelectric property snse N-type Multi-walled carbon nanotubes Mechanical property

Synthesis and enhanced piezoelectric response of CVD-grown snse layered nanosheets for flexible nanogenerators

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Nano Research 2023年第9期16卷 11839-11845页

作者： Fumei Yang Man-Chung Wong Jianfeng Mao Zehan Wu Jianhua Hao Department of Applied Physics the Hong Kong Polytechnic UniversityHong Kong 999077China

Piezoelectricity is the electric charge which accumulates in certain materials in response to mechanical stimuli,while piezoelectric nanogenerators(PENGs)converting mechanical energy into electricity can be widely used for energy harvesting and self-powered systems.The group IV-VI monochalcogenides may exhibit strong piezoelectricity because of their puckered C_(2v)symmetry and electronic structure,making them promising for flexible PENG.Herein,we investigated the synthesis and piezoelectric properties of multilayer snse nanosheets grown by chemical vapor deposition(CVD).The snse nanosheets exhibited high single-crystallinity,large area,and good stability.The strong layer-dependent in-plane piezoelectric coefficient of snse nanosheets showed a saturated trend to be~110 pm/V,which overcomes the weak piezoelectric response or odd-even effects in other layered nanosheets.A high energy conversion efficiency of 9.3%and a maximum power density of 538 mW/cm^(2)at 1.03%strain have been demonstrated in a snse-based PENG.Based on the enhanced piezoelectricity of snse and attractive output performance of the nanogenerator,a self-powered sensor for human motion monitoring is further developed.These results demonstrate the strong piezoelectricity in high quality CVD-grown snse nanosheets,allowing for application in flexible smart piezoelectric sensors and advanced microelectromechanical devices.

关键词： snse piezotronics piezoresponse force microscope piezoelectric nanogenerator self-powered device

Understanding the phenomenon of capacity increasing along cycles: In the case of an ultralong-life and high-rate snse-Mo-C anode for lithium storage

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Journal of Energy Chemistry 2022年第9期31卷 133-142,I0005页

作者： Xin Wu Xingyu Xiong Bin Yuan Jun Liu Renzong Hu School of Materials Science and Engineering.Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials South China University of TechnologyGuangzhou 510640GuangdongChina

A good cycling stability is a prerequisite for the application of metal-based materials in lithium-ion batteries(LIBs). However, an abnormal increase in capacity is often observed, which has rarely been focused on in many studies. In our snse-Mo-C composite anode, a high reversible capacity of 737.4 mAh g^(-1)remained after 5000 cycles at 5 A g^(-1)between 0.01 and 3.0 V versus Li/Li+. However, a continuous capacity increase occurred in the initial cycles, with 1086.9 mAh g^(-1)after 1000 cycles and 1216.9 mAh g^(-1)after 1500 cycles, respectively. Further studies revealed that the electrolyte decomposed at high potentials(2.5–3.0 V) and provided additional capacities. The cut-off voltage and electrolyte filling were controlled, which eliminated the impact of electrolyte decomposition, prevented rapid capacity decay, and provided a stable cycling performance for snse-Mo-C anodes in LIBs. This work shows that the composite anode is promising for lithium storage and the findings provide new insights into understanding and controlling the phenomenon of capacity increase with cycling in metal-based anode materials.

关键词： Lithium-ion battery snse Capacity increase Electrolyte decomposition

Greatly enhanced mechanical properties of thermoelectric snse through microstructure engineering

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Journal of Advanced Ceramics 2023年第5期12卷 1081-1089页

作者： Chen Chen Bin-Hao Wang Chen Chen Hai-Dong Zhao Bin Zhang Dan Wang Tao Shen Peng-Hui Li Song Zhao Dong-Li Yu Yong-Jun Tian Bo Xu Center for High Pressure Science(CHiPS) State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China School of Physical Sciences Great Bay UniversityDongguan 523000China

The outstanding thermoelectric material, snse, is also known for its inferior mechanical properties, which bring great inconvenience for its application in thermoelectric devices. In this work, snse bulks were prepared via a sequential procedure of high-pressure synthesis (HPS), ball milling, and spark plasma sintering (SPS). The produced polycrystalline samples with a unique microstructure of tightly-bound quasi-equiaxed grains exhibited excellent mechanical properties. The Vickers hardness (HV), compressive strength (σ_(c)), and bending strength (σ_(b)) reached 1.1 GPa, 300 MPa, and 90 MPa, respectively, all of which are far superior to those of ordinary polycrystalline snse. Furthermore, the microstructures did not deteriorate thermoelectric performance. This work demonstrated an effective procedure to prepare polycrystalline microstructure-engineered snse materials, which not only show advantages in device applications but also shed light on property enhancement for other layer-structured thermoelectric materials.

关键词： thermoelectric materials snse mechanical properties hardness

Thermoelectric properties of polycrystalline(snse)1-x(Agsnse2)x/2 alloys

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Progress in Natural Science:Materials International 2022年第2期32卷 242-247页

作者： Long Jiang Weiwei Liu Lihong Han Hao Sun Yu Wang Yihua Zhang Haijun Wu State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials CNPC Tubular Goods Research Institute MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter and State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University School of Materials Science and Engineering Chang'an University

snse is considered as a thermoelectric material with great potential and advantages due to the record of high thermoelectric figure of merit(ZT) of 2.6 at 923 K in single crystals.However,it is difficult to use single crystal snse in practice due to its poor mechanical properties and high manufacturing costs.Meanwhile,the polycrystalline snse also is also not suitable for applications due to its much lower thermoelectric performance compared with single crystal snse.Therefore,improving the thermoelectric properties of polycrystalline snse has become a hot research topic.In this paper,Agsnse2doped into snse to increase the carrier density of the system and thus improve its thermoelectric properties.It is found that the addition of Agsnse2can effectively improve the thermoelectric performance of polycrystalline snse.A peak ZT of 0.81 was obtained at 713 K for(snse)0.95(Agsnse2)0.025,which is 305% higher than that of the undoped one.This reveals that Agsnse2-doped snse alloy may become a thermoelectric material system with great application potential and significance.

关键词： Thermoelectric materials snse Agsnse 2