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https://www.readbyqxmd.com/read/28923974/manipulation-of-ionized-impurity-scattering-for-achieving-high-thermoelectric-performance-in-n-type-mg3sb2-based-materials
#1
Jun Mao, Jing Shuai, Shaowei Song, Yixuan Wu, Rebecca Dally, Jiawei Zhou, Zihang Liu, Jifeng Sun, Qinyong Zhang, Clarina Dela Cruz, Stephen Wilson, Yanzhong Pei, David J Singh, Gang Chen, Ching-Wu Chu, Zhifeng Ren
Achieving higher carrier mobility plays a pivotal role for obtaining potentially high thermoelectric performance. In principle, the carrier mobility is governed by the band structure as well as by the carrier scattering mechanism. Here, we demonstrate that by manipulating the carrier scattering mechanism in n-type Mg3Sb2-based materials, a substantial improvement in carrier mobility, and hence the power factor, can be achieved. In this work, Fe, Co, Hf, and Ta are doped on the Mg site of Mg3.2Sb1.5Bi0.49Te0...
September 18, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28917826/potassic-zeolites-from-brazilian-coal-ash-for-use-as-a-fertilizer-in-agriculture
#2
Camila Gomes Flores, Helena Schneider, Nilson Romeu Marcilio, Lizete Ferret, João Carlos Pinto Oliveira
Brazilian coal has an ash content ranging from 30 to 50% by weight. Consequently, its use in coal-fired thermoelectric for power production generates a lot of waste. The construction sector is the largest consumer of coal ash, but it cannot absorb the entire amount generated. Thus, other applications for coal ash should be studied in aim to optimize the use of this industrial waste. This research had as focus to synthesize potassic zeolite from of the coal ash into on potassium fertilizer for the grown wheat plant...
September 13, 2017: Waste Management
https://www.readbyqxmd.com/read/28916809/thermoelectricity-in-vertical-graphene-c60-graphene-architectures
#3
Qingqing Wu, Hatef Sadeghi, Víctor M García-Suárez, Jaime Ferrer, Colin J Lambert
Recent studies of single-molecule thermoelectricity have identified families of high-performance molecules. However, in order to translate this discovery into practical thin-film energy-harvesting devices, there is a need for an understanding of the fundamental issues arising when such junctions are placed in parallel. This is relevant because controlled scalability might be used to boost electrical and thermoelectric performance over the current single-junction paradigm. As a first step in this direction, we investigate here the properties of two C60 molecules placed in parallel and sandwiched between top and bottom graphene electrodes...
September 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28913423/opto-thermophoretic-assembly-of-colloidal-matter
#4
Linhan Lin, Jianli Zhang, Xiaolei Peng, Zilong Wu, Anna C H Coughlan, Zhangming Mao, Michael A Bevan, Yuebing Zheng
Colloidal matter exhibits unique collective behaviors beyond what occurs at single-nanoparticle and atomic scales. Treating colloidal particles as building blocks, researchers are exploiting new strategies to rationally organize colloidal particles into complex structures for new functions and devices. Despite tremendous progress in directed assembly and self-assembly, a truly versatile assembly technique without specific functionalization of the colloidal particles remains elusive. We develop a new strategy to assemble colloidal matter under a light-controlled temperature field, which can solve challenges in the existing assembly techniques...
September 2017: Science Advances
https://www.readbyqxmd.com/read/28910522/giant-pressure-induced-enhancement-of-seebeck-coefficient-and-thermoelectric-efficiency-in-snte
#5
Jason Baker, Ravhi S Kumar, Changyong Park, Curtis Benson, Andrew Cornelius, Nenad Velisavljevic
The thermoelectric properties of polycrystalline SnTe have been measured up to 4.5 GPa at 330 K. SnTe shows an enormous enhancement in Seebeck coefficient greater than 200% after 3 GPa, which correlates to a known pressure-induced structural phase transition that is observed through simultaneous in-situ X-ray diffraction measurement. Electrical resistance and relative changes to the thermal conductivity were also measured providing determination of relative changes in the dimensionless figure of merit (ZT), which increases dramatically after 3 GPa reaching 350% of the lowest pressure ZT value...
September 14, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28906522/correlation-between-electronic-structure-transport-and-electrochemical-properties-of-a-lini1-y-zcoymnzo2-cathode-material
#6
Janina Molenda, Anna Milewska, Wojciech Zając, Michal Rybski, Janusz Tobola
Herein, the correlation between electronic structure, transport and electrochemical properties of layered LixNi1-y-zCoyMnzO2 cathode material is revealed. Comprehensive experimental studies of physicochemical properties of LixNi1-y-zCoyMnzO2 cathode material (XRD, electrical conductivity, thermoelectric power) are supported by electronic structure calculations performed using the Korringa-Kohn-Rostoker method with the coherent potential approximation (KKR-CPA) to account for the chemical disorder. It is found that even small O defects (∼1%) could significantly modify electronic density of states DOS characteristics via the formation of extra broad peaks inside the former band gap leading to its substantial narrowing...
September 14, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28905945/the-effect-of-sn-doping-on-thermoelectric-performance-of-n-type-half-heusler-nbcosb
#7
Lihong Huang, Qinyong Zhang, Yumei Wang, Ran He, Jing Shuai, Jianjun Zhang, Chao Wang, Zhifeng Ren
Herein, Sn was successfully doped into the Sb site of n-type NbCoSb half-Heusler compounds to tune the carrier concentration, and a maximum ZT value of ∼0.56 was obtained at 973 K for NbCoSb1-xSnx with x = 0.2, an increase of ∼40% as compared to that of NbCoSb. This enhancement is mainly attributed to the reduced carrier concentration by Sn doping, leading to a doubled Seebeck coefficient at 300 K. More importantly, the total thermal conductivity was reduced with Sn doping, and the reduction was mainly due to the lowered electron thermal conductivity...
September 14, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28905895/superparamagnetic-enhancement-of-thermoelectric-performance
#8
Wenyu Zhao, Zhiyuan Liu, Zhigang Sun, Qingjie Zhang, Ping Wei, Xin Mu, Hongyu Zhou, Cuncheng Li, Shifang Ma, Danqi He, Pengxia Ji, Wanting Zhu, Xiaolei Nie, Xianli Su, Xinfeng Tang, Baogen Shen, Xiaoli Dong, Jihui Yang, Yong Liu, Jing Shi
The ability to control chemical and physical structuring at the nanometre scale is important for developing high-performance thermoelectric materials. Progress in this area has been achieved mainly by enhancing phonon scattering and consequently decreasing the thermal conductivity of the lattice through the design of either interface structures at nanometre or mesoscopic length scales or multiscale hierarchical architectures. A nanostructuring approach that enables electron transport as well as phonon transport to be manipulated could potentially lead to further enhancements in thermoelectric performance...
September 13, 2017: Nature
https://www.readbyqxmd.com/read/28905892/materials-science-nanomagnets-boost-thermoelectric-output
#9
Stephen R Boona
No abstract text is available yet for this article.
September 13, 2017: Nature
https://www.readbyqxmd.com/read/28902205/electron-phonon-scattering-effect-on-the-lattice-thermal-conductivity-of-silicon-nanostructures
#10
Bo Fu, Guihua Tang, Yifei Li
Nanostructuring technology has been widely employed to reduce the thermal conductivity of thermoelectric materials because of the strong phonon-boundary scattering. Optimizing the carrier concentration can not only improve the electrical properties, but also affect the lattice thermal conductivity significantly due to the electron-phonon scattering. The lattice thermal conductivity of silicon nanostructures considering electron-phonon scattering is investigated for comparing the lattice thermal conductivity reductions resulting from nanostructuring technology and the carrier concentration optimization...
September 13, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28901138/solution-processed-cds-cu2s-superlattice-nanowire-with-enhanced-thermoelectric-property
#11
Ze Xiong, Yu Cai, Xiaodong Ren, Bei Cao, Jianjun Liu, Ziyang Huo, Jinyao Tang
Previously, the solution based cation exchange reaction has been extensively studied for the synthesis of the complex heteroepitaxial nanocolloidals. Here, we demonstrated that the strain induced selective phase segregation technique can also be applied to large size nanowires in a well-studied CdS/Cu2S system, leading to the formation of superlattice nanowire structure with a simple solution-based cation exchange reaction. This structural evolution is driven by the distinct interface formation energy at different CdS facets as indicated by ab initio calculation...
September 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28895395/thermoelectric-properties-of-sns-with-na-doping
#12
Binqiang Zhou, Shuai Li, Wen Li, Juan Li, Xinyue Zhang, Siqi Lin, Zhiwei Chen, Yanzhong Pei
Tin sulfide (SnS), a low-cost compound from the IV-VI semiconductors, has attracted particular attention due to its great potential for large-scale thermoelectric applications. However, pristine SnS shows a low carrier concentration, which leads to a low thermoelectric performance. In this work, sodium is utilized to substitute Sn to increase the hole concentration and consequently improve the thermoelectric power factor. The resultant Hall carrier concentration up to ∼10(19) cm(-3) is the highest concentration reported so far for this compound...
September 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28892387/functionalized-poly-3-4-ethylenedioxy-bithiophene-films-for-tuning-electrochromic-and-thermoelectric-properties
#13
Yongjing Hu, Xiaofang Liu, Fengxing Jiang, Weiqiang Zhou, Congcong Liu, Xuemin Duan, Jingkun Xu
Conductive thiophene-base polymers have gained great concern in the organic electron materials such as electrochromic and thermoelectric materials. However, they suffer from poor electron transport property and long-term stability leading to the limited development eventually. Here, we proposed a strategy of functionalized thiophene-based polymers with oligo(ethylene glycol) or alkyl side chains and synthesized a series of poly(3,4-ethylenedioxy bithiophene)s (PEDTs) to tune their electrochromic and thermoelectric properties...
September 11, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28884765/enhancement-in-thermoelectric-performance-of-sige-nanoalloys-dispersed-with-sic-nanoparticles
#14
Sivaiah Bathula, M Jayasimhadri, Bhasker Gahtori, Anil Kumar, A K Srivastava, Ajay Dhar
SiGe is one of the most widely used thermoelectric materials for radioisotope thermoelectric generator applications for harnessing waste-heat at high temperatures. In the present study, we report a simple experimental strategy for enhancing the thermoelectric and mechanical properties of n-type SiGe nanoalloys by dispersing SiC nanoparticles in a SiGe nanoalloy matrix. This strategy yielded a high value of figure-of-merit (ZT) of ∼1.7 at 900 °C in the SiGe/SiC nanocomposite, which is nearly twice that reported for its pristine bulk counterpart and ∼15% higher than that of pristine SiGe nanoalloys...
September 8, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28884709/hydrothermal-synthesis-of-snq-q-te-se-s-and-their-thermoelectric-properties
#15
Dan Feng, Zhenhua Ge, Yuexing Chen, Ju Li, Jiaqing He
Lead-free IV-VI semiconductors SnQ (Q=Te, Se, S) are deemed as promising thermoelectric materials. In this work, we designed a hydrothermal route to selectively synthesize single phase SnTe, SnSe and SnS nanopowders. For all three samples, the phase structure were characterized by X-ray diffraction, SnTe particles with octahedron structure and SnSe/SnS particles with plate-like shape were observed by field emission scanning electron microscopy and transmission electron microscopy, the formation mechanism was discussed in detail...
September 8, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28883653/excellent-thermoelectric-properties-induced-by-different-contact-geometries-in-phenalenyl-based-single-molecule-devices
#16
Xuan-Hao Cao, Wu-Xing Zhou, Chang-Yong Chen, Li-Ming Tang, Mengqiu Long, Ke-Qiu Chen
We investigated the thermoelectric properties of phenalenyl-based molecular devices by using the non-equilibrium Green's function method combined with density function theory. The results show that the thermoelectric performance of molecular device can be significantly improved by different contact geometries. The ZT value of the device can reach 1.2 at room temperature, which is two orders of magnitude higher than that of graphene. Moreover, the change of the coupling between molecule and electrodes can also enhance the ZT value...
September 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28875034/crystal-structure-across-the-%C3%AE-to-%C3%AE-phase-transition-in-thermoelectric-cu2-x-se
#17
Espen Eikeland, Anders B Blichfeld, Kasper A Borup, Kunpeng Zhao, Jacob Overgaard, Xun Shi, Lidong Chen, Bo B Iversen
The crystal structure uniquely imparts the specific properties of a material, and thus provides the starting point for any quantitative understanding of thermoelectric properties. Cu2-x Se is an intensely studied high performing, non-toxic and cheap thermoelectric material, and here for the first time, the average structure of β-Cu2-x Se is reported based on analysis of multi-temperature single-crystal X-ray diffraction data. It consists of Se-Cu layers with additional copper between every alternate layer...
July 1, 2017: IUCrJ
https://www.readbyqxmd.com/read/28873319/facile-thermal-and-optical-ignition-of-silicon-nanoparticles-and-micron-particles
#18
Sidi Huang, Venkata Sharat Parimi, Sili Deng, Srilakshmi Lingamneni, Xiaolin Zheng
Silicon (Si) particles are widely utilized as high-capacity electrodes for Li-ion batteries, elements for thermoelectric devices, agents for bio-imaging and therapy, and many other applications. However, Si particles can ignite and burn in air at elevated temperatures or under intense illumination. This poses potential safety hazards when handling, storing, and utilizing these particles for those applications. In order to avoid the problem of accidental ignition, it is critical to quantify the ignition properties of Si particles as functions of their sizes and porosities...
September 5, 2017: Nano Letters
https://www.readbyqxmd.com/read/28872649/effect-of-alloying-on-thermal-conductivity-and-thermoelectric-properties-of-coass-and-cosbs
#19
Prabhjot Kaur, Chandan Bera
The effect of alloying on the thermoelectric properties of cobaltite, CoAsS, and paracostibite, CoSbS, has been investigated in this study. Density functional theory and the Boltzmann transport equation have been applied to explore the role of phonon-phonon scattering and atomistic scattering due to alloying in phonon transport. An almost 44% reduction in thermal conductivity of CoAs0.8Sb0.2S alloy compared to pure CoAsS and an ∼15% reduction in thermal conductivity of CoAs0.2Sb0.8S compared to pure CoSbS were found...
September 5, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28870076/in-situ-complementary-doping-thermoelectric-improvements-and-strain-induced-structure-within-alternating-pedot-pss-pani-layers
#20
Virgil Andrei, Kevin Bethke, Fani Madzharova, Aafke Cecile Bronneberg, Janina Kneipp, Klaus Rademann
Although the deposition of alternating layers from poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) and polyaniline (PANI) salts has recently provided a breakthrough in the field of conductive polymers, the cause for the conductivity enhancement has remained unclear. In this work, we report a cooperative doping effect between alternating PANI base and PEDOT:PSS layers, resulting in electrical conductivities of 50-100 S cm(-1) and power factors of up to 3.0±0.5 μW m(-1) K(-2), which surpass some of the recent values obtained for protonated PANI/PEDOT:PSS multi-layers by a factor of 20...
September 5, 2017: ACS Applied Materials & Interfaces
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