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Alloying engineering for thermoelectric performance enhancement in p-type skutterudites with synergistic carrier concentration optimization and thermal conductivity reduction

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Journal of Advanced Ceramics 2023年第3期12卷 539-552页

作者： Zhiyuan Liu Yonggui Wang Ting Yang Zuju Ma Huiyan Zhang Hailing Li Ailin Xia Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials Ministry of EducationAnhui University of TechnologyMaanshan 243002China School of Materials Science and Engineering Anhui University of TechnologyMaanshan 243002China School of Environmental and Materials Engineering Yantai UniversityYantai 264005China

The enhancements in thermoelectric(TE)performances of p-type skutterudites are usually limited due to the relatively low Seebeck coefficients owing to the higher carrier concentration and more impurity phases induced by inherent structural instability of a Fe-based *** shown in this study,alloying engineering of Ni doping at Fe sites in a p-type CeFe_(3.8)Co_(0.2)Sb_(12)skutterudite can not only reduce the impurity phases with high thermal conductivity but also regulate the carrier concentration,and thus significantly increase the Seebeck *** thermal conductivity was largely suppressed due to the enhanced point defect phonon scattering and decreased hole *** a result,a TE figure of merit ZT of the CeFe_(3.5)Ni_(0.3)Co_(0.2)Sb_(12)sample reached 0.8,which is approximately 50%higher than that of a Ni-free *** Ni doping can maintain a high ZT at a high temperature by controlling the reduction in a band ***,a high average ZT close to 0.8 at 650–800 K for CeFe_(3.5)Ni_(0.3)Co_(0.2)Sb_(12)was obtained,which was comparable to or even higher than those of the reported Ce-filled Fe-based skutterudites due to the synergistic optimization of electrical and thermal *** study provides a strategy to synergistically optimize electrical–thermal performances of the p-type skutterudites by alloying engineering.

关键词： p-type skutterudite materials Ni doping synergistic optimization thermoelectric(TE)properties

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Enhanced thermoelectric performance of Cu_(2)SnSe_(3) via synergistic effects of Cd-doping and CuGaTe_(2) alloying

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Rare Metals 2022年第10期41卷 3466-3474页

作者： Yi-Jing Fan Kun-Ling Peng Yu-Ling Huang Hui-Jun Liao Zheng-Yong Huang Jian Li Yan-Ci Yan Hao-Shuang Gu Bin Zhang Yong-Ming Hu Xu Lu Xiao-Yuan Zhou Faculty of Physics and Electronic Sciences Hubei Key Laboratory of Ferro and Piezoelectric Materials and DevicesHubei UniversityWuhan430062China College of Physics Chongqing UniversityChongqing400044China State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing UniversityChongqing400044China School of Science Chongqing University of Posts and TelecommunicationsChongqing400065China Analytical and Testing Center Chongqing UniversityChongqing400044China

In this work,we show significantly enhanced thermoelectric performance in Cu_(2) SnSe_(3) via a synergistic effect of Cd-doping and CuGaTe_(2) alloying in the temperature range of 300-823 *** the electron and phonon transport properties can be simultaneously regulated by Cd doping at Sn site,leading to a higher quality ***,a maximum figure of merit(zT) value of ~0.68 was obtained for Cu_(2) Sn_(0.93)Cd_(0.07)Se_(3) sample at823 K,which is about four times higher than that of the pristine sample(zT=0.18 at 773 K).Furthermore,Cu_(2) Sn_(0.93)Cd_(0.07)Se_(3) was alloyed with CuGaTe_(2) to reduce the lattice thermal conductivity in the high-temperature ***,a further enhanced zT value(0.77,823 K) was achieved in the(Cu_(2) Sn_(0.93)Cd_(0.07)Se_(3))_(0.94)(CuGaTe_(2))_(0.06) sample,with a high average zT(zT_(ave)) value of0.30 between 300 and 823 *** results demonstrate that Cd-doping combined with CuGaTe2 alloying could be an effective method to enhance zT values of Cu_(2) SnSe_(3) based compounds.

关键词： Cu_(2)SnSe_(3) synergistic optimization Alloying Quality factor Thermoelectric

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A review of CoSb_(3)-based skutterudite thermoelectric materials

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Journal of Advanced Ceramics 2020年第6期9卷 647-673页

作者： Zhi-Yuan LIU Jiang-Long ZHU Xin TONG Shuo NIU Wen-Yu ZHAO School of Materials Science and Engineering Anhui University of TechnologyMaanshan 243002China Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials Ministry of EducationAnhui University of TechnologyMaanshan 243002China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

The binary skutterudite CoSb_(3) is a narrow bandgap semiconductor thermoelectric(TE)material with a relatively flat band structure and excellent electrical ***,thermal conductivity is very high because of the covalent bond between Co and Sb,resulting in a very low ZT ***,researchers have been trying to reduce its thermal conductivity by the different optimization *** addition,the synergistic optimization of the electrical and thermal transport parameters is also a key to improve the ZT value of CoSb_(3) material because the electrical and thermal transport parameters of TE materials are closely related to each other by the band structure and scattering *** review summarizes the main research progress in recent years to reduce the thermal conductivity of CoSb_(3)-based materials at atomic-molecular scale and nano-mesoscopic *** also provide a simple summary of achievements made in recent studies on the non-equilibrium preparation technologies of CoSb_(3)-based materials and synergistic optimization of the electrical and thermal transport *** addition,the research progress of CoSb_(3)-based TE devices in recent years is also briefly discussed.

关键词： skutterudite CoSb_(3)-based materials lattice thermal conductivity synergistic optimization thermoelectric properties thermoelectric devices

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Research progress of p-type Fe-based skutterudite thermoelectric materials

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Frontiers of Materials Science 2021年第3期15卷 317-333页

作者： Xin TONG Zhiyuan LIU Jianglong ZHU Ting YANG Yonggui WANG Ailin XIA Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials(Ministry of Education) Anhui University of TechnologyMaanshan 243002China School of Materials Science and Engineering Anhui University of TechnologyMaanshan 243002China

Filled skutterudite is currently one of the most promising intermediate-temperature thermoelectric(TE)materials,having good thermoelectric transport performance and excellent mechanical *** the preparation of high-efficiency filled skutterudite TE devices,it is important to have p-and n-type filled skutterudite TE materials with matching ***,the current TE properties of p-type Fe-based filled skutterudite materials are worse than n-type filled skutterudite ***,how to obtain high-performance p-type Fe-based filled skutterudite materials is the key to preparation of high-efficiency skutterudite-based TE *** review summarizes some methods for optimizing the thermal transport performance of p-type filled skutterudite materials at the atomic-molecular and nano-mesoscopic scale that have been used in recent *** methods include doping,multi-atom filling,and use of low-dimensional structure and of *** addition,the synergistic optimization methods of the electrical and thermal transport parameters and advanced preparation technologies of p-type filled skutterudite materials in recent years are also briefly *** optimizational methods and advanced preparation technologies can significantly improve the TE properties of p-type Fe-based filled skutterudite materials.

关键词： p-type Fe-based filled skutterudite lattice thermal conductivity synergistic optimization preparation technology thermoelectric property

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