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Thermoelectrocatalysis: an emerging strategy for converting waste heat into chemical energy

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National Science Review 2024年第4期11卷 19-21页

作者： Yuqiao Zhang Shun li Jianming Zhang li-dong zhao Yuanhua lin Weishu liu Federico Rosei Institute of Quantum and Sustainable Technology(IQST) School of Chemistry and Chemical Engineering Jiangsu University School of Materials Science and Engineering Beihang University State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Department of Materials Science and Engineering Southern University of Science and Technology Centre for Energy Materials and Telecommunications Institut national de la recherche scientifique

Waste heat emissions are universally present in the environment and industrial production. Innovations aimed at efficiently utilizing low-grade thermal energy have long been desired. Among these, thermoelectric materi...

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Contrasting strategies of optimizing carrier concentration in bulk InSe for enhanced thermoelectric performance

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Rare Metals 2024年第9期43卷 4425-4432页

作者： Hao-Nan Shi Shu-lin Bai Yu-Ping Wang li-Zhong Su Qian Cao Cheng Chang li-dong zhao School of Materials Science and Engineering Beihang University School of Materials Science and Engineering Taiyuan University of Science and Technology Huabei Cooling Device Co.Ltd.

Indium selenide (InSe),as a wide-bandgap semiconductor,has received extensive attention in the flexible electronics field in recent years due to its exceptional plasticity and promising thermoelectric ***,the low carrier concentration severely limits its thermoelectric performance *** this work,we conducted contrasting strategies that can be employed to increase the carrier concentration of InSe,including bandgap narrowing and heterovalent ***,the carrier concentration initially increases as a result of the reduced bandgap upon Te alloying and then slightly decreases due to the weak electronegativity of *** Br doping realizes high carrier concentration by pushing the Fermi level into the conduction bands and activating the multiple *** the other hand,both Te and Br obviously suppress the thermal conductivity due to the point defect *** contrast,Br doping realizes a higher thermoelectric performance with a maximum ZT of～0.13 at 773 K benefiting from the better optimization of carrier *** work elucidates the strategies for enhancing carrier concentration at anion sites and demonstrates the high efficiency of halogen doping in ***,the carrier concentration of InSe is promising to be further optimized,and future work should focus on employing approaches such as cation doping or secondphase compositing.

关键词： Bandgap Carrier concentration Heterovalent doping InSe Thermoelectric

Strategies to advance thermoelectric performance of PbSe and PbS materials

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Rare Metals 2024年第9期43卷 4099-4114页

作者： Zheng-Hao Hou Xin Qian Qiu-Juan Cui Shu-Fang Wang li-dong zhao Shijiazhuang Key Laboratory of Low Carbon Energy Materials College of Chemical EngineeringShijiazhuang University Hebei Key Lab of Optic-Electronic Information and Materials College of Physics Science and Technology Hebei University School of Materials Science and Engineering Beihang University

Thermoelectric materials possess the unique capability to convert thermal energy into electric energy and vice versa, making them promising for waste heat recovery and efficient cooling systems. Currently, extensively investigated thermoelectric materials such as Bi2Te3,PbTe and GeTe exhibit superior thermoelectric properties at room temperature and medium temperature ***, the broad application of these thermoelectric materials has been impeded by the high cost and restricted accessibility of Te and Ge in the earth's crust. Over the past few years, researchers have shown increasing interest in PbSe-and PbS-based materials, primarily attributed to their abundant elemental supply and relatively low costs. The assessment of research progress and a comprehensive overview of optimization strategies in time can significantly contribute to further improving the thermoelectric performance. These strategies include optimizing carrier concentration(aliovalent doping, dynamic doping and defect state), enhancing density-of-state effective mass(band convergence, band flattening and energy filtering effect), optimizing carrier mobility(band sharpening and band alignment) and reducing lattice thermal conductivity(all-scale hierarchical defect structures designing). This systematic summary and analysis provide novel insights and perspectives for the development of thermoelectric materials.

关键词： Carrier concentration

Magnetic resonance imaging-based radiomics model for preoperative assessment of risk stratification in endometrial cancer

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World Journal of Clinical Cases 2024年第26期12卷 5908-5921页

作者： Zhi-Yao Wei Zhe Zhang dong-li zhao Wen-Ming zhao Yuan-Guang Meng Department of Obstetrics and Gynecology Seventh Medical Center of Chinese People’s Liberation Army General HospitalBeijing 100700China National Genomics Data Center and Chinese Academy of Sciences Key Laboratory of Genome Sciences and Information Beijing Institute of GenomicsChinese Academy of Sciences and China National Center for BioinformationBeijing 100700China

BACKGROUND Preoperative risk stratification is significant for the management of endometrial cancer(EC)*** based on magnetic resonance imaging(MRI)in combination with clinical features may be useful to predict the risk grade of *** To construct machine learning models to predict preoperative risk stratification of patients with EC based on radiomics features extracted from *** The study comprised 112 EC *** participants were randomly separated into training and validation groups with a 7:3 *** regression analysis was applied to uncover independent clinical *** predictors were then used to create a clinical *** radiomics features from the T2-weighted imaging and diffusion weighted imaging sequences of MRI images,the Mann-Whitney U test,Pearson test,and least absolute shrinkage and selection operator analysis were employed to evaluate the relevant radiomic features,which were subsequently utilized to generate a radiomic *** machine learning strategies were used to construct radiomic models that relied on the screening *** logistic regression method was used to construct a composite nomogram that incorporated both the radiomic signature and clinical independent risk *** Having an accuracy of 0.82 along with an area under the curve(AUC)of 0.915[95%confidence interval(CI):0.806-0.986],the random forest method trained on radiomics characteristics performed better than *** predictive accuracy of radiomics prediction models surpassed that of both the clinical nomogram(AUC:0.75,95%CI:0.611-0.899)and the combined nomogram(AUC:0.869,95%CI:0.702-0.986)that integrated clinical parameters and radiomic *** The MRI-based radiomics model may be an effective tool for preoperative risk grade prediction in EC patients.

关键词： Endometrial cancer Risk stratification Radiomics Machine learning Nomogram

基于PG分级的高寒高海拔地区沥青结合料性能与适应性

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公路交通科技 2024年第8期41卷 78-85页

作者：李东钊龚演严二虎田波权磊交通运输部公路科学研究院北京100088

为解决高寒高海拔地区沥青结合料性能不足的问题,结合京藏高速公路格尔木至那曲段地形地貌与气候变化特点,依托沿线多个气象观测站的30 a气象资料,对所处地貌、气候特征、海拔、交通荷载量等相关数据进行统计学分析、计算,探索高海拔大... 详细信息

为解决高寒高海拔地区沥青结合料性能不足的问题,结合京藏高速公路格尔木至那曲段地形地貌与气候变化特点,依托沿线多个气象观测站的30 a气象资料,对所处地貌、气候特征、海拔、交通荷载量等相关数据进行统计学分析、计算,探索高海拔大温差地区沥青胶结料PG分级方法的适应性。结果表明:基于青藏地区现场监测结果对LTPP高温温度计算模型进行修正,提出了更适合高寒高海拔地区沥青结合料高温温度计算公式,提高了沥青高温性能指标计算公式的可靠性;在京藏高速公路格拉段对沥青胶结料的PG分级建议值最高达到PG76-22,在高寒高海拔地区应充分考虑海拔增高对沥青低温抗裂性能的影响,将低温等级提高1~2级;在那曲地区建议使用SBRⅡ-A改性沥青,在格尔木地区建议使用SBS改性沥青;在沱沱河、五道梁地区,建议开发抗紫外温拌改性沥青,采用更高标号的基质沥青对沥青进行SBS/SBR复合改性,并进行适用性研究。本次研究成果为高寒高海拔地区沥青结合料的材料开发技术、施工工艺提升及工程化应用提供一定参考,有利于提高沥青路面修建质量,延长使用寿命。

关键词：道路工程高低温性能 PG分级沥青公路战略研究计划(SHRP)

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Investigation on halogen-doped n-type SnTe thermoelectrics

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Rare Metals 2022年第11期41卷 3803-3814页

作者： Chang-Rong Guo Bing-Chao Qin dong-Yang Wang li-dong zhao School of Materials Science and Engineering Beihang UniversityBeijing100191China

Recent theoretical predictions and experimental findings on the transport properties of n-type SnTe have triggered extensive researches on this simple binary compound,despite the realization of n-type SnTe being a great ***,Cl as a donor dopant can effectively regulate the position of Fermi level in Sn_(0.6)Pb_(0.4)Te matrix and successfully achieve the n-type transport behavior in *** outstanding power factor of~14.7μW·cm^(-1)·K^(-2) at 300 K was obtained for Cl-doped Sn_(0.6)Pb_(0.4)Te *** combining the experimental analysis with theoretical calculations,the transport properties of n-type SnTe thermoelectrics doped with different halogen dopants(Cl,Br,and I)were then systematically investigated and *** results demonstrated that Br and I had better doping efficiencies compared with Cl,which contributed to the well-optimized carrier concentrations of~1.03×10^(19)and~1.11×10^(19)cm^(-3)at 300 K,*** improved n-type carrier concentrations effectively lead to the significant enhancement on the thermoelectric performance of n-type *** study further promoted the experimental progress and deep interpretation of the transport features in n-type SnTe *** present results could also be crucial for the development of n-type counterparts for SnTe-based thermoelectric devices.

关键词： Thermoelectric performance n-type SnTe Halogen doping Doping efficiency

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Enhanced thermoelectric performance in Cl-doped BiSbSe_(3) with optimal carrier concentration and effective mass

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Journal of Materials Science & Technology 2021年第11期70卷 67-72页

作者： Sining Wang lizhong Su Yuting Qiu Yu Xiao li-dong zhao School of Materials Science and Engineering Beihang UniversityBeijing 100191China Beihang School Beihang UniversityBeijing 100191China

Possessing inherently low thermal conductivity,BiSbSe_(3) is a promising thermoelectric material for medium ***,to substantially optimize the thermoelectric performance of BiSbSe_(3),researchers mainly focus on the strategies to improve its electrical transport *** these strongly coupled thermoelectric parameters,carrier concentration and effective mass are two intrinsic variables to decisively affect the electrical transport *** this work,Cl as a donor dopant is effective to provide extra electrons in n-type BiSbSe_(3),and the carrier concentration and effective mass can be well optimized simultaneously with increasing Cl content owing to the multiple conduction bands in BiSbSe_(3).What’s more,maximum weighted mobility~53 cm^(2)V^(-1)s^(-1)is obtained in Cl-doped BiSbSe_(3),which contributes to a largely enhanced power factor~4.8μW cm^(-1)K^(-2)at room temperature and outperforms other halogen-doped BiSbSe_(3) ***,combining the significantly enhanced power factor and maintained low thermal conductivity,a maximum ZT~1.0 is achieved in Cl-doped BiSbSe_(3) at 800 K.

关键词： BiSbSe_(3) Thermoelectric performance Effective mass Carrier concentration

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Slowing down the heat in thermoelectrics

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InfoMat 2021年第7期3卷 755-789页

作者： Bingchao Qin dongyang Wang li-dong zhao School of Materials Science and Engineering Beihang UniversityBeijingChina

Heat transport has various applications in solid *** particular,the thermoelectric technology provides an alternative approach to traditional methods for waste heat recovery and solid-state refrigeration by enabling direct and reversible conversion between heat and *** enhancing the thermoelectric performance of the materials,attempts must be made to slow down the heat transport by minimizing their thermal conductivity(κ).In this study,a continuously developing heat transport model is reviewed *** models for predicting the lattice thermal conductivity(κlat)of materials are summarized,which are significant for the rapid screening of thermoelectric materials with lowκ***,typical strategies,including the introduction of extrinsic phonon scattering centers with multidimensions and internal physical mechanisms of materials with intrinsically lowκlat,for slowing down the heat transport are *** defect centers with multidimensions substantially scatter various-frequency phonons;the intrinsically lowκlat in materials with various crystal structures can be attributed to the strong anharmonicity resulting from weak chemical bonding,resonant bonding,low-lying optical modes,liquid-like sublattices,off-center atoms,and complex crystal *** review provides an overall understanding of heat transport in thermoelectric materials and proposes effective approaches for slowing down the heat transport to depressκlat for the enhancement of thermoelectric performance.

关键词： anharmonicity heat transport phonon scattering thermal conductivity thermoelectric materials

Estimation of the potential performance in p-type SnSe crystals through evaluating weighted mobility and effective mass

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Journal of Materiomics 2020年第4期6卷 671-676页

作者： Bingchao Qin Wenke He li-dong zhao School of Materials Science and Engineering Beihang UniversityBeijing100191China

It has been proved that the thermoelectric performance of p-type SnSe crystals can be optimized through enhancing carrier *** calculations of electronic band structure elucidate that this approach can be interpreted by including multiple valence *** better estimate the potential performance,we proposed the transport properties for p-type SnSe crystals and analyzed the weighted mobility from the experimental *** weighted mobility approaches~600 cm^(2)V1s1 when the carrier concentration is as high as~6.31019 cm*** with obtained lattice thermal conductivity,through rising carrier concentration,the quality factor B possesses significant improvements of~235%and 138%at 300 K and 773 K,*** comparing weighted mobility and Hall mobility,two effective mass values~0.9 me and 1.8 me can be derived using carrier *** is expected that the ZT~1.0 at 300K and ZT~2.9 at 773 K can be obtained when the carrier concentration of~8.01019 cm3 and the effective mass~1.8 me were *** work provides an alternative way to comprehend the performance optimization in thermoelectric community.

关键词： Thermoelectric p-type SnSe crystals Weighted mobility Quality factor Effective mass