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In-situ growth of high-performance(Ag,Sn)co-doped coSb_(3)thermoelectric thin films

Journal of Materials Science & Technology 2021年第33期92卷 178-185页

作者： Zhuang-Hao Zheng Jun-Yu Niu Dong-Wei Ao Bushra Jabar Xiao-Lei Shi Xin-Ru Li Fu Li Guang-Xing Liang Yue-Xing Chen Zhi-Gang Chen Ping Fan 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 Centre for Future Materials University of Southern QueenslandSpringfield CentralBrisbaneQueensland 4300Australia School of Mechanical and Mining Engineering The University of QueenslandSt LuciaBrisbaneQueensland 4072Australia

Owing to the unique features,such as mechanically robust,low-toxic,high stability,and high thermoelectric performance,coSb_(3)-based skutterudite materials are among art-of-the state thermoelectric *** this work,we develop a facile in-situ method for the growth of well-crystallinity(Ag,Sn)co-doped coSb_(3)thin *** preparation method can efficiently control the dopant concentration and distribution in the thin *** the density functional theory calculation and the experimental results suggest that Sn and Ag dopants trend to enter the lattice and preferentially fill interstitial ***,band structure calculation results suggest that the Fermi level moves into the conduction bands due to co-doping and eventually induces the increased electrical conductivity,which agrees with the optimization of carrier ***,an increase in the density of state after co-doping is responsible for the increased Seebeck *** a result,the power factors of(Ag,Sn)co-doped coSb_(3)thin films are greatly enhanced,and the maximum power factor achieves over 0.3 m W m^(-1)K^(-2)at 623 K,which is almost two times than that of the un-doped coSb_(3)*** microstructures,including Sb vacancies and Ag/Sn interstitial atoms as point defects,and a high density of lattice distortions coupled with nano-sized Ag-rich grains,lead to all scale phonon *** a result,a reduced thermal conductivity of~0.28 W m^(-1)K^(-1)and a maximum ZT of~0.52 at 623 K are obtained from(Ag,Sn)co-doped coSb_(3)thin *** study indicates our facile in-situ growth can be used to develop high-performance dual doped coSb_(3)thins.

关键词： coSb_(3)thin films Thermoelectric Magnetron sputtering co-doping

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Effect of Nb^(5+)and Cu^(2+)codoping on thermal properties of Gd_(2)Zr_(2)O_(7)ceramic

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Journal of Rare Earths 2021年第2期39卷 180-185页

作者： Tao Jiang Min Xie Lili Guan Xuanli Wang Xiwen Song School of Materials and Metallurgy Inner Mongolia University of Science and TechnologyBaotou 014010China

In this work,Nb^(5+)and Cu^(2+)were selected to partially substitute Zr4+in Gd_(2)Zr_(2)O_(7)for studying the phase structure,microscopic morphology and thermal ***_(2)(Zr_(1-3 x/2)Nb_(x)CU_(x/2))_(2)O_(7)(x=0,0.05,0.1,0.15,0.2,0.25)ceramic materials were synthesized by high-temperature solid-state reaction *** results show that the Gd_(2)(Zr_(1-3 x/2)Nb_(x)Cu_(x)/2)_(2)O_(7)ceramics present cubic pyrochlore structure with clear grain boundaries and dense cell *** the thermal expansion coefficient of Gd_(2)(Zr_(1-3 x/2)Nb_(x)Cu_(x/2))_(2)O_(7)ceramics gradually decreases because of the incorporation of Nb^(5+)and Cu^(2+)into Zr-site in Gd_(2)Zr_(2)O_(7).Meanwhile,its thermal conductivity decreases firstly and then increases with the doping of Nb^(5+)and Cu^(2+),which reaches the lowest value for the composition of Gd_(2)(Zr_(0.85)Nb_(0.1)Cu_(0.05))_(2)O_(7).

关键词： Gd_(2)Zr_(2)O_(7) co-doping Pyrochlore structure Thermal properties Rare earths

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Synthesis and characterization of LiNi_(0.95-x)co_xAl_(0.05)O_2 for lithium-ion batteries

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Rare Metals 2006年第4期25卷 303-308页

作者： ZHU Xianjun ZHAN Hui LIU Hanxing ZHOU Yunhong State Key Laboratory of Advanced Technology and Processing for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China college of Chemical and Molecular Science Wuhan University Wuhan 430072 China

Samples of LiNi0.95-xcoxAl0.05O2 （x = 0.10 and 0.15） and LiNiO2, synthesized by the solid-state reaction at 725℃ for 24 h from LiOH-H2O, Ni2O3, co2O3, and AI（OH）3 under an oxygen stream, were characterized by TG-DTA, XRD, SEM, and electrochemical tests. Simultaneous doping of cobalt and aluminum at the Ni-site in LiNiO2 was tried to improve the cathode performance for lithium-ion batteries. The results showed that co-doping （especially, 5 at.% A1 and 10 at.% co） definitely had a large beneficial effect in increasing the capacity （186.2 mA.h/g of the first discharge capacity for LiNio.s.42OoaoAlo.0502） and cycling behavior （180.1 mA-h/g after 10 cycles for ***2） compared with 180.7 mA.h/g of the first discharge capacity and 157.7 mA.h/g of the tenth discharge capacity for LiNiO2, respectively. Differen- tial capacity versus voltage curves showed that the co-doped LiNio.95_***2 had less intensity of the phase transitions than the pristine LiNiO2.

关键词： electrochemistry LiNi0.95-xcoxAl0.05O2 lithium-ion batteries co-doping cathode materials LiNiO2

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Enhanced photocatalytic activity of (La, N) co-doped TiO_2 by TiCl_4 sol-gel autoigniting synthesis

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Journal of University of Science and Technology Beijing 2007年第6期14卷 552-557页

作者： Zhongqing Liu Yanping Zhou Zhenghua Li Yichao Wang Changchun Ge Materials Science and Engineering School University of Science and Technology Beijing Beijing 100083 China

（La, N） co-doped TiO2 photocatalysts were synthesized using TiC14 sol-gel autoignidng synthesis （SAS） starting from a complex compound system of TiCl4-La（NO3）3-citric acid-NH4NO3-NHyH2O, in which the （La, N） co-doped process was accompushed in the formation of TiO2 nanocrystals. The prepared samples were characterized by using X-ray diffraction （XRD）, X-ray photoemission spectroscopy （XPS） and UV-vis diffuse reflectance spectra. The results indicated that nitrogen and lanthanum were incorporated into the lattice and interstices of titania nanocrystals, which resulted in narrowing the band gap and promoting the separation of photoexcited hole-electron pairs, respectively, and showing expected red-shifts and enhanced photocatalytic activity under visible light. The mechanism on nitrogen doping and enhancement in photocatalyfic activity of （La, N） co-doped titania by SAS was discussed in detail.

关键词： photocatalyst co-doping titanium dioxide sol-gel autoigniting synthesis photocatalytic activity

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Thermoelectric properties of Bi0.5Sb1.4-xNaxIn0.1Te3 alloys

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Rare Metals 2019年第12期38卷 1187-1192页

作者： Yue-Zhen Jiang Xing-Kai Duan School of Electronic Engineering Jiujiang UniversityJiujiang 332005China School of Mechanical and Materials Engineering Jiujiang UniversityJiujiang 332005China

The Bi(0.5)Sb(1.4-x)NaxIn(0.1)Te3(x=0.02-0.20)alloys were fabricated by high vacuum melting and hotpressing *** phase structures and morphology of the bulk samples were characterized by X-ray diffraction(XRD) and scanning electron microscope(SEM),*** of In and Na co-doping on the electrical and thermal transport properties were studied from room temperature to 500 *** coefficient of the Bi(0.5)Sb(1.5)Te3 can be enhanced by substituting Sb with In and Na at near room *** electrical conductivity of the In and Na co-doped samples is lower than that of the Bi(0.5)Sb(1.5)Te3 alloy from room temperature to 500 *** and Na co-doping of appropriate percentage optimizes the thermal conductivity of the Bi(0.5)Sb(1.5)Te3 *** minimum value of thermal conductivity of Bi(0.5)Sb(1.36)Na(0.04)In(0.1)Te3 alloy is 0.45 W·m^(-1) K^(-1) at 323 *** leads to a great improvement in the thermoelectric figure of merit(zT).The maximum zT value reaches 1.42 at 323 K.

关键词： Microstructure co-doping Thermal conductivity Electrical properties

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Tunable luminescence in co-doped Zn3Al2Ge2O10:Cr3+by controlling crystal field splitting and nephelauxetic effect

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Journal of Rare Earths 2020年第12期38卷 1265-1272页

作者： Qiongyu Bai Suling Zhao Zheng Xu Panlai Li Key Laboratory of Luminescence and Optical Information(Beijing Jiaotong University) Ministry of EducationBeijing 100044China Institute of Optoelectronics Technology Beijing Jiaotong UniversityBeijing 100044China college of Physics Science&Technology Hebei Key Lab of Optic-Electronic Information and MaterialsHebei UniversityBaoding 071002China

Ce3+/Dy3+/Tb3+/Eu3+/Mn2+and Cr3+ions co-doped Zn3 Al2 Ge2 O10 phosphor were prepared by a hightemperature solid-state method.X-ray diffraction patterns prove the cubic phase structure of prepared Zn3 Al2 Ge2 O10 phosphor,Emission,excitation spectra and decay curves confirm the tunable *** degrees of the decrease of emission FWHM in Zn3 Al2 Ge2 O10:0.02 Cr3+,RE(RE=Ce3+,Dy3+,Tb3+,Eu3+)and Zn3 Al2 Ge2 O10:0.02 Cr3+,Mn2+are *** reason of variable FWHM is the effect of crystal field splitting and nephelauxetic effect,and the nephelauxetic effect is ***,the emission FWHM decreases with the increasing concentration of Mn2+/Tb3+/Eu3+in Zn3 Al2 Ge2 O10:0.02 Cr3+,and for Zn3 Al2 Ge2 O10:0.02 Cr3+,Ce3+and Zn3 Al2 Ge2 O10:0.02 Cr3+,Dy3+,it is a *** variation of Zn3 Al2 Ge2 O10:0.02 Cr3+,Tb3+is more obvious than that of Zn3 Al2 Ge2 O10:0.02 Cr3+,Eu3+,because Tb3+ion has smaller ***,the tunable luminescence of Cr3+can be realized by co-doping different *** these phosphors have potential applications in light-emitting diodes for plant growth.

关键词： Iuminescence Zn3Al2Ge2O10:Cr3+ co-doping Ions Rare earths

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Enhanced thermoelectric properties of hydrothermally synthesized n-type Se&Lu-codoped Bi2Te3

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Journal of Advanced Ceramics 2020年第4期9卷 424-431页

作者： Xiaolei Shi Xin Ai Qihao Zhang Xiaofang Lu Shijia Gu Li Su Lianjun Wang Wan Jiang State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai201620China college of Information Science and Technology Donghua UniversityShanghai201620China State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing100049China Institute of Functional Materials Donghua UniversityShanghai201620China Engineering Research Center of Advanced Glasses Manufacturing Technology Ministry of EducationShanghai201620China

N-type Se&Lu-codoped Bi2Te3 nanopowders were prepared by hydrothermal method and sintered by spark plasma sintering technology to form dense *** further doping Se element into Lu-doped Bi2Te3 samples,the thickness of the nanosheets has the tendency to become *** electrical conductivity of Lu0.1Bi1.9Te3−xSex material is reduced with the increasing Se content due to the reduced carrier concentration,while the Seeback coefficient values are *** lattice thermal conductivity of the Lu0.1Bi1.9Te3−xSex is greatly reduced due to the introduced point defects and atomic mass ***,the Lu0.1Bi1.9Te2.7Se0.3 sample obtained a maximum ZT value of 0.85 at 420 *** study provides a low-cost and simple low-temperature method to mass production of Se&Lu-codoped Bi2Te3 with high thermoelectric performance for practical applications.

关键词： thermoelectric material n-type bismuth telluride hydrothermal synthesis co-doping

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Direct observation of the distribution of impurity in phosphorous/boron co-doped Si nanocrystals

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Chinese Physics B 2023年第12期32卷 454-458页

作者：李东珂韩俊楠孙腾陈佳明 Etienne Talbot Rémi Demoulin 陈王华皮孝东徐骏陈坤基 School of Electronic Science and Engineering National Laboratory of Solid State MicrostructuresCollaborative Innovation Center of Advanced MicrostructuresJiangsu Provincial Key Laboratory of Advanced Photonic and Electronic MaterialsNanjing UniversityNanjing 210000China ZJU-Hangzhou Global Scientific and Technological Innovation Center School of Materials Science and EngineeringZhejiang UniversityHangzhou 311200China Univ Rouen Normandie INSA Rouen NormandieCNRSGPM UMR 6634F-76000 RouenFrance School of Physical Science and Technology Ningbo UniversityNingbo 315211China

doping in Si nanocrystals is an interesting topic and directly studying the distribution of dopants in phosphorous/boron co-doping is an important issue facing the scientific *** this study,atom probe tomography is performed to study the structures and distribution of impurity in phosphorous/boron co-doped Si nanocrystals/SiO_(2) *** with phosphorous singly doped Si nanocrystals,it is interesting to find that the concentration of phosphorous in co-doped samples can be significantly *** simulation suggests that phosphorous-boron pairs are formed in co-doped Si nanocrystals with the lowest formation energy,which also reduces the formation energy of phosphorous in Si *** results indicate that co-doping can promote the entry of phosphorous impurities into the near-surface and inner sites of Si nanocrystals,which provides an interesting way to regulate the electronic and optical properties of Si nanocrystals such as the observed enhancement of conductivity and sub-band light emission.

关键词： Si nanocrystals phosphorous and boron co-doping impurity distribution

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Tuning of interactions between cathode and lithium polysulfide in Li-S battery by rational halogenation

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Journal of Energy Chemistry 2020年第10期29卷 147-152页

作者： Samson O.Olanrele Zan Lian Chaowei Si Shuo Chen Bo Li Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016LiaoningChina School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016LiaoningChina Key Laboratory of Functional Inorganic Material Chemistry(Ministry of Education of China) School of Chemistry and Materials ScienceHeilongjiang UniversityHarbin 150080HeilongjiangChina Chemical Sciences Department Mountain Top UniversityOgun StateNigeria

Li-S batteries have aroused intense interests as one of the most promising high-energy-density storage ***,the complex undesired shuttle effect induced by dissolution and diffusion of lithium polysulfide intermediates remains the major setback of this *** modification of carbon cathode through heteroatom-doping is widely accepted as an effective method to inhibit the shuttle effect in Li-S battery ***,using first principle calculations,we systematically examined the interaction between halogenated graphene and lithium polysulfide *** is found that the halogen dopants(F,Cl,Br,I)significantly modify the local electronic structure of adsorption site and further induce a polarization to trap the ***,a concave curve is observed from F to I for lithium polysulfide adsorption rather than a linear *** exceptions demonstrated from iodine dopant is carefully analyzed and attributed to its unique charge ***,boron as second dopant further strengthens the interaction between halogenated graphene and polysulfide *** on halogenation strategy,lithium polysulfide/cathode interactions are tuned in a wide range,which can also be of great importance to accelerate redox reaction in Li-S ***,an effective method by halogenation is verified to regulate the adsorption of lithium polysulfide and also enhance the reaction kinetics of the Li-S battery system.

关键词： Li-S battery Halogenation Shuttle effect co-doping

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Synthesis and Characterization of LiNi_(0.85)co_(0.15-x)Al_xO_2 as Cathode Materials for Lithium-ion Batteries

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Journal of Materials Science & Technology 2006年第1期22卷 35-39页

作者： Xianjun ZHU Pingchu CHEN Hui ZHAN Yunhong ZHOU college of Chemistry Central China Normal University Wuhan 430079 China college of Chemical and Molecular Science Wuhan University Wuhan 430072 China

LiNi0.85co0.15-xAlxO2 samples （x=0.025, 0.05 and 0.10） were prepared by solid state reaction at 725℃ for 24 h from LiOH-H2O, Ni2O3, co2O3 and Al（OH）3 under oxygen flow. Layered LiNiO2 simultaneously doped by co-Al has been tried to improve the cathode performance. The results showed that substitution of optimum amount Al and co for the Ni in LiNiO2 definitely had some beneficial effect on increasing the capacity and cycling behavior. When increasing x in LiNio.85co0.15-xAlxO2, the initial discharge capacity decreased and its cyclability increased. compromising high specific capacity and good cyclability, the optimum x in LiNi0.85co0.15-xAlxO2 was x=0.05. As a consequence, LiNi0.85co0.15-xAlxO2 had the first discharge capacity of 186.2 mAh/g and a capacity of 180.1 mAh/g after 10 cycles. Differential capacity vs voltage curves indicated that the co-doped LiNiO2 showed suppression of the phase transitions as compared with LiNiO2.

关键词： Cathode materials co-doping LiNi0.85co0.15-xAlxO2 Lithium ion batteries

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