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High performance solid-state thermoelectric energy conversion via inorganic metal halide perovskites under tailored mechanical deformation

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Frontiers in Energy 2022年第4期16卷 581-594页

作者： Lifu YAN Lingling ZHAO Guiting YANG Shichao LIU Yang LIU Shangchao LIN National Engineering Research Center of Turbo-Generator Vibration School of Energy and EnvironmentSoutheast UniversityNanjing 210096China State Key Laboratory of Space Power-Sources Technology Shanghai Institute of Space Power-SourcesShanghai 200245China Key Laboratory for Power Machinery and Engineering of the Ministry of Education School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Solid-state thermoelectric energy conversion devices attract broad research interests because of their great promises in waste heat recycling,space power generation,deep water power generation,and temperature control,but the search for essential thermoelectric materials with high performance still remains a great *** an emerging low cost,solution-processed thermoelectric material,inorganic metal halide perovskites CsPb(I_(1–x)Br_(x))_(3) under mechanical deformation is systematically investigated using the first-principle calculations and the Boltzmann transport *** is demonstrated that halogen mixing and mechanical deformation are efficient methods to tailor electronic structures and charge transport properties in CsPb(I_(1–x)Br_(x))_(3) *** mixing leads to band splitting and anisotropic charge transport due to symmetry-breakinginduced intrinsic *** band splitting reconstructs the band edge and can decrease the charge carrier effective mass,leading to excellent charge transport *** deformation can further push the orbital energies apart from each other in a more controllable manner,surpassing the impact from intrinsic *** anisotropic charge transport properties and ZT values are sensitive to the direction and magnitude of strain,showing a wide range of variation from 20%to 400%(with a ZT value of up to 1.85)compared with unstrained *** power generation efficiency of the thermoelectric device can reach as high as approximately 12%using mixed halide perovskites under tailored mechanical deformation when the heat-source is at 500 K and the cold side is maintained at 300 K,surpassing the performance of many existing bulk thermoelectric materials.

关键词： inorganic metal halide perovskites mechanical deformation thermoelectrics first-principle calculations Boltzmann transport theory

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Induced Surface Austenitic-Martensitic Transition by mechanical deformation in Mn *** of Surface Properties

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Journal of Iron and Steel Research(International) 2011年第S1期18卷 223-227页

作者： Boutarek-Zaourar Nama Mansour Samir Amara Sif Eddine USTHB FGMGPBP 32 EL ALIA BAB EZZOUARALGER USTHB FCBP 32 EL ALIA BAB EZZOUARALGER

For a lot of applications in the mechanical industry,both attractive and mechanical properties of materials and wear resistance are *** such a combination is achieved only by performing surface *** aim of this investigation is the consolidation of 12% Mn steel surface by treatment of *** show by optical and scanning electron microscopy,X ray diffraction,X ray spectrometry analysis and also by the realization of micro hardness,the effect of this kind of treatment on the mechanical and structural stability of the surface *** of many obtained results,we distinguish the clear surface consolidation induced by a modification of surface zone crystalline *** mechanical deformation causes the transformation from an austenitic structure to the martensitic structure.

关键词： phase transition Mn steel mechanical deformation surface properties impact treatment

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Control of Phase Separation and Crystallization for High-Efficiency and mechanically Deformable Organic Solar Cells

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能源与环境材料（英文） 2023年第5期6卷 389-397页

作者： Zicheng Ding Yi Zhang Yueling Su Yin Wu Yanchun Han Kui Zhao Shengzhong(Frank)Liu Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationShaanxi Key Laboratory for Advanced Energy DevicesShaanxi Engineering Lab for Advanced Energy TechnologySchool of Materials Science and EngineeringShaanxi Normal UniversityXi'an 710119China State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of Sciences5625 Renmin StreetChangchun 130022China Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationShaanxi Key Laboratory for Advanced Energy DevicesShaanxi Engineering Lab for Advanced Energy TechnologySchool of Materials Science and EngineeringShaanxi Normal UniversityXi'an 710119China Dalian National Laboratory for Clean Energy iChEMDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China

Stretchable organic solar cells(OSCs)have great potential as power sources for the next-generation wearable *** blending rigid photovoltaic components with soft insulating materials can easily endow the mechanical ductility of active layers,the photovoltaic efficiencies usually drops in the resulting ***,a high photovoltaic efficiency of 15.03％and a large crack-onset strain of 15.70％is simultaneously achieved based on a ternary blend consisting of polymer donor poly[(2,6-(4,8-bis(5-(2-ethylhexyl-3-fluoro)thiophen-2-yl)-benzo[1,2-b:4,5-b']dithiophene))-alt-(5,5-(1',3'-di-2-thienyl-5',7'-bis(2-ethylhexyl)benzo[1',2'-c:4',5'-c']dithiophene-4,8-dione)](PM6),non-fullerene accepter 2,2'-((2Z,2'Z)-((12,13-bis(2-ethylhexyl)-3,9-diundecyl-12,13-dihydro-[1,2,5]thiadiazolo[3,4-e]thieno[2",3":4',5']thieno[2',3':4,5]pyrrolo[3,2-g]thieno[2',3':4,5]thieno[3,2-b]indole-2,10-diyl)bis(methanylylidene))bis(5,6-difluoro-3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile(Y6),and soft elastomer polystyrene-block-poly(ethylene-ran-butylene)-block-polystyrene(SEBS)through the control of phase separation and *** employing a high-boiling point solvent additive 1-chloronaphthalene(CN)with different solubilities for PM6 and Y6,the aggregation dynamics of PM6 and Y6 as well as the film solidification process are dramatically altered,allowing for the different molecular rearrangement and liquid-liquid phase separation ***,the ternary film with optimal CN content presents decreased SEBS domains and moderately improved molecular ordering of PM6 and Y6,enabling effective mechanical deformation and charge generation/*** revealed corrections between the film-formation process,film microstructure,and photovoltaic/mechanical characteristics in the ternary blend provide deep understanding of the morphology control toward high-performance stretchable OSCs.

关键词： film microstructure mechanical deformation molecular aggregation dynamics photovoltaic performance stretchable organic solar cells

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Flow units as dynamic defects in metallic glassy materials

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National Science Review 2019年第2期6卷 304-323页

作者： Zheng Wang Wei-Hua Wang Institute of Physics Chinese Academy of Sciences

In a crystalline material, structural defects such as dislocations or twins are well defined and largely determine the mechanical and other properties of the material. For metallic glass(MG) with unique properties in the absence of a long-range lattice, intensive efforts have focused on the search for similar 'defects'. The primary objective has been the elucidation of the flow mechanism of MGs. However,their atomistic mechanism of mechanical deformation and atomic flow response to stress, temperature, and failure, have proven to be challenging. In this paper, we briefly review the state-of-the-art studies on the dynamic defects in metallic glasses from the perspective of flow units. The characteristics, activation and evolution processes of flow units as well as their correlation with mechanical properties, including plasticity,strength, fracture, and dynamic relaxation, are introduced. We show that flow units that are similar to structural defects such as dislocations are crucial in the optimization and design of metallic glassy materials via the thermal, mechanical and high-pressure tailoring of these units. In this report, the relevant issues and open questions with regard to the flow unit model are also introduced and discussed.

关键词： metallic glass flow unit flow glass transition mechanical deformation property optimization

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Experiment on Wear Behavior of High Pressure Gas Seal Faces

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Chinese Journal of mechanical Engineering 2014年第6期27卷 1287-1293页

作者： XU Jing PENG Xudong BAI Shaoxian MENG Xiangkai LI Jiyun MOE Engineering Research Center of Process Equipment and Its Remanufacture Zhejiang University of Technology School of mechanical Engineering Hangzhou Dianzi University

Current researches show that mechanical deformation of seal ring face makes fluid film clearance decrease at high pressure side, thus a divergent clearance is formed and face wear occurs more seriously at the high pressure side than that on the low pressure side. However, there is still lack of published experimental works enough to prove the theoretical results. In this paper, a spiral groove dry gas seal at high pressures is experimentally investigated so as to prove the face wear happened at the high pressure side of seal faces due to the face mechanical deformation, and the wear behavior affected by seal ring structure is also studied. The experimental results show that face wear would occur at the high pressure side of seal faces due to the deformation, thus the leakage and face temperature increase, which all satisfies the theoretical predictions. When sealed pressure is not less than 5 MPa, the pressure can provide enough opening force to separate the seal faces. The seal ring sizes have obvious influence on face wear. Face wear, leakage and face temperature of a dry gas seal with the smaller cross sectional area of seal ring are less than that of a dry gas seal with bigger one, and the difference of leakage rate between these two sizes of seal face width is in the range of 24%–25%. Compared with the effect of seal ring sizes, the effect of secondary O-ring seal position on face deformation and face wear is less. The differences between these two types of dry gas seals with different secondary O-ring seal positions are less than 5.9% when the rotational speed varies from 0 to 600 r/min. By linking face wear and sealing performance changes to the shift in mechanical deformation of seal ring, this research presents an important experimental method to study face deformation of a dry gas seal at high pressures.

关键词： dry gas seal structures face wear high pressure mechanical deformation

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Piezomodulation of Connection Conductance TlInTe₂

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Open Journal of Inorganic Non 2016年第4期6卷 25-32页

作者： Eldar M. Gojaev Sevda Kh. Agaeva Samire O. Kulieva Mahir T. Dadashov Azerbaijan Technical University Baku Azerbaijan National Aviation Academy of Azerbaijan Mardakan Azerbaijan

This paper discusses the development method of strain sensors based on acicular single crystal compound TlInTe2 is grown by Bridgman-Stockbarger technique. Creating mechanically reliable ohmic contacts on said obtained single crystals was carried out directly by spot welding wires corresponding to the ends of the capacitor discharge heated in a stream of inert gas from the single crystal TlInTe2. This method of creating contacts proved effective and reliable. Sensors made by this manner stuck to the calibrated beams of steel thickness of 1 mm, a length of 30 mm and a corresponding optimal regime got sensors with a maximum piezo-sensitivity. It was found that if enshrined at one end of a thin steel sheet with glued crystals TlInTe2 initiate periodic mechanical vibrations to the same frequency, occurs conductivity modulation. The effect of piezo-modulation conductance depending on the degree of deformation, illumination in interval of deformation and lux illumination in room temperature were studied. The study showed that the more mechanical deformation and illumination are, the more modulation amplitude is. We studied the modulation of the conductivity of crystals during mechanical deformation values of 8, 14, 19, 23 and 27 × 10-5and illuminance 1000, 2750, 4750 and 6500 suites. Investigations the level piezo-signal depending on the amplitude of mechanical vibrations at frequency of 85 Hz, it is found that with increasing magnitude of the mechanical deformation of 7 × 10-5 and 26 × 10-5 amplitude increases six times. It is shown that the piezoresistive effect is clearly manifested in dynamic mode. Additional conductivity occurs during mechanical deformation. When the illuminated samples piezoconductivity magnitude increases linearly.

关键词： Electrical Conductivity Compound TlInTe2 Piezosensitivity Illumination mechanical deformation Piezomodulation

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