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co-doping strategy enhanced the ionic conductivity and excellent lithium stability of garnet-type Li_(7)La_(3)Zr_(2)O_(12)electrolyte in all solidstate lithium batteries

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Journal of Materiomics 2023年第4期9卷 651-660页

作者： Ziqiang Xu Xin Hu Bowen Fu Kashif Khan Jintian Wu Teng Li Haiping Zhou Zixuan Fang Mengqiang Wu School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu611731SichuanChina Yangtze Delta Region Institute(HuZhou) University of Electronic Science and Technology of ChinaHuzhou313001ZhejiangChina School of Chemical Engineering Sichuan University of Science&EngineeringZigong643000China

Garnet-type Li_(7)La_(3)Zr_(2)O_(12)(LLZO)is one of the most promising solid-state electrolytes(SSEs).However,the application of LLZO is limited by structural instability,low ionic conductivity,and poor lithium *** obtain a garnet-type solid electrolyte with a stable structure and high ionic conductivity,a series of TaeCe co-doping cubic Li_(6.4)La_(3)Zr_(1.4-x)Ta_(0.6)Ce_(x)O_(12)(LLZTco,x=,0.02,0.04,0.06,0.08,0.10,0.20,0.30)electrolytes were successfully synthesized through conventional solid-phase *** Ta^(5+)doping can introduce more lithium vacancies and effectively maintain the stability of the cubic *** Ce^(4+)with a larger ionic radius is introduced into the lattice to widen the Lit migration bottleneck size,which significantly increased the ionic conductivity to 1.05×10^(-3)S/*** also shows excellent stability to lithium metal by the optimization of Lit transport ***||LLZTco||Li symmetric cells can cycle stably for more than 6000 h at a current density of 0.1 mA/cm^(2)without any surface *** commercialization potential of LLZTco samples in all solid-state lithium batteries(ASSLBs)is confirmed by the prepared LiFePO_(4)||LLZTco||Li cells with a capacity retention rate of 98%after 100 cycles at *** new co-doping method presents a practical solution for the realization of high-performance ASSLBs.

关键词： Solid-state electrolytes Garnet-type co-doping Bottleneck size Ionic conductivity Lithium stability

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Bi and S co-doping g-C_(3)N_(4)to Enhance Internal Electric Field for Robust Photocatalytic Degradation and H_(2) Production

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Chinese Journal of Structural Chemistry 2022年第6期41卷 69-78页

作者： Yan Hu Xibao Li Weiwei Wang Fang Deng Lu Han Xiaoming Gao Zhijun Feng Zhi Chen Juntong Huang Fanyan Zeng Fan Dong School of Materials Science and Engineering Nanchang Hangkong UniversityNanchang 330063China Key Laboratory of Jiangxi Province for Persistent Pollutants control and Resources Recycle Nanchang Hangkong UniversityNanchang 330063China School of Materials and Metallurgy University of Science and Technology LiaoningAnshan 114051China Department of Chemistry and Chemical Engineering Shaanxi Key Laboratory of Chemical Reaction EngineeringYan’an UniversityYan’an 716000China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 611731China

By adjusting the type and proportion of doping elements in the g-C_(3)N_(4)-based photocatalyst,the internal electric field(IEF)strength of the semiconductor can be *** can effectively enhance the driving force of charge separation in the photocatalytic *** is found that the introduction of appropriate concentration of Bi and S into the skeleton structure of g-C_(3)N_(4)can achieve efficient degradation of tetracycline(TC)and other pollutants in the liquid environment and excellent photocatalytic H_(2)evolution performance(1139μmol·L^(-1)·h^(-1)).Since the prepared samples have similar crystal structures,the relative strength of IEF can be *** can be used as the basis for adjusting the IEF strength of g-C_(3)N_(4)-based semiconductor by element *** addition,the Bi and S co-doped g-C_(3)N_(4)samples after solvothermal reflux show good chemical stability and can reduce the nanostructure defects caused by co-doping of heteroatoms,thus it provides a novel solution for the construction of g-C_(3)N_(4)-based dual-function photocatalyst with high activity and stability.

关键词： photocatalysis g-C_(3)N_(4) co-doping IEF strength antibiotic

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Theoretical study on the improvement of the doping efficiency of Al in 4H-SiC by co-doping group-IVB elements

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Chinese Physics B 2022年第4期31卷 512-517页

作者：黄渊超王蓉钱怡潇张懿强杨德仁皮孝东 State Key Laboratory of Silicon Materials and School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027China Hangzhou Global Scientific and Technological Innovation Center Zhejiang UniversityHangzhou 311200China School of Materials Science and Engineering&Henan Institute of Advanced Technology Zhengzhou UniversityZhengzhou 450001China

The p-type doping efficiency of 4 H silicon carbide(4 H-SiC)is rather low due to the large ionization energies of p-type *** an issue impedes the exploration of the full advantage of 4 H-SiC for semiconductor *** this study,we show that co-doping group-IVB elements effectively decreases the ionization energy of the most widely used p-type dopant,i.e.,aluminum(Al),through the defect-level repulsion between the energy levels of group-IVB elements and that of Al in 4 *** group-IVB elements Ti has the most prominent *** decreases the ionization energy of Al by nearly 50%,leading to a value as low as~0.13 *** a result,the ionization rate of Al with Ti co-doping is up to~5 times larger than that without co-doping at room temperature when the doping concentration is up to 10^(18)cm^(-3).This work may encourage the experimental co-doping of group-IVB elements such as Ti and Al to significantly improve the p-type doping efficiency of 4 H-SiC.

关键词： 4H-SiC p-type co-doping ab initio study

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Tungsten and phosphate polyanion co-doping of Ni-ultrahigh cathodes greatly enhancing crystal structure and interface stability

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Chinese Journal of Chemical Engineering 2021年第9期34卷 144-151页

作者： Huawei Zhu Haifeng Yu Zhaofeng Yang Hao Jiang Chunzhong Li Shanghai Engineering Research Center of Hierarchical Nanomaterials Frontiers Science Center for Materiobiology and Dynamic ChemistrySchool of Materials Science and EngineeringEast China University of Science&TechnologyShanghai 200237China

The Ni-ultrahigh cathode material is one of the best choices for further increasing energy-density of lithium-ion batteries(LIBs),but they generally suffer from the poor structure stability and rapid capacity ***,the tungsten and phosphate polyanion co-doped LiNi_(0.9)co_(0.1)O_(2)cathode materials are successfully fabricated in terms of Li(Ni_(0.9)co_(0.7))_(1-x)W_(x)O_(2-4y)(PO_(4))_(y) by the precursor modification and subsequent *** higher bonding energy of W—O(672 kJ·mol^(-1))can extremely stabilize the lattice oxygen of Ni-rich oxides compared with Ni—O(391.6 kJ·mol^(-1))and co—O(368 kJ·mol^(-1)).Meanwhile,the stronger bonding of Ni—(PO_(4)^(3-))***—O could fix Ni cations in the transition metal layer,and hence suppressing the Li/Ni disorder during the charge/discharge ***,the optimized Li(Ni_(0.9)co_(0.1))_(0.99)W_(0.01)O_(1.96)(PO_4)_(0.01)delivers a remarkably extended cycling life with 95.1%retention of its initial capacity of 207.4 mA·h·g^(-1)at 0.2 C after 200 ***,the heteroatoms doping does not sacrifice the specific capacity even at different rates.

关键词： LiNi_(0.9)co_(0.1)O_(2) co-doping Crystal stability Cycling life Li-ion batteries

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co-doping of hydroxyapatite with zinc and fluoride improves mechanical and biological properties of hydroxyapatite

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Progress in Natural Science:Materials International 2014年第4期24卷 340-349页

作者： Idil Uysal Feride Severcan Aysen Tezcaner Zafer Evis Middle East Technical University Department of Biomedical Engineering Middle East Technical University Department of Biological Sciences Middle East Technical University Department of Engineering Sciences

Hydroxyapatite(HA) co-doped with Zn2+ tand F- ions was synthesized by precipitation method for the first time in this *** spectroscopy revealed Zn2+ tand F ions incorporation into HA ***-doping of Zn2+ tand F- ions decreased unit cell volume of HA and decreased grain ***2+ tor 5 mol% F addition into HA significantly improved its *** was increased with Zn2+ taddition and further increase was detected with F ***2+ tand F co-doped samples had higher fracture toughness than pure ***2+ tincorporation to the structure resulted in an increase in cell proliferation and ALP activity of cells,and further increase was observed with 1 mol%F *** superior mechanical properties and biological response 2Zn1 F is a good candidate for biomedical applications.

关键词： Hydroxyapatite co-doping Microstructure Microhardness Biocompatibility

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Effects of Sm co-doping on Luminescent Properties of Sr4Al14O25:M (M=Mn4+, Cr3+) Phosphors

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Chinese Journal of Chemical Physics 2015年第6期28卷 -页

作者： Yu-dong Xu Xu-dong Peng Lei Wang Min Shi Yuan Zhang Quan Wang San Qi School of Materials Science and Engineering Hefei University of Technology Hefei 230009 China

The Sr4Al14O25:M and doped Sr4Al14O25:M+Sm3+ (M=Mn4+, Cr3+) phosphors were synthesized by a solid-state reaction method and their luminescent properties were investigated. The results showed that the co-doping of Sm ions did not change the positions of excitation band and emission band but significantly improved the luminescent properties of Sr4Al14O25:Cr3+ phosphors; whereas, the emission intensity of Sr4Al14O25:Mn4+ was reduced remarkably when Sm ions were co-doped. In addtion, a radiative-form energy transfer from Sm3+ to Cr3+ was observed for the first time in the Cr, Sm co-doped Sr4Al14O25 phosphors. The results indicated that Sm ions could significantly improve the emission intensity of Sr4Al14O25:Cr3+, making the Sm3+co-doped Sr4Al14O25:Cr3+ phosphor a promising candidate for the applications in display and solid state lightening.

关键词： Phosphor co-doping Strontium aluminates Energy transfer

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First-principles investigation of N-Ag co-doping effect on electronic properties in p-type ZnO

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Chinese Physics B 2010年第4期19卷 328-334页

作者：左春英温静柏跃磊 Arts and Science Department of Heilongjiang August First Land Reclamation University Center for composite Materials and Structures Harbin Institute of Technology

The geometric structure, band structure and density of states of pure, Ag-doped, N-doped, and N-Ag codoped wurtzite ZnO have been investigated by the first-principles ultra-soft pseudopotential method based on the density functional theory. The calculated results show that the carrier concentration is increased in the ZnO crystal codoped by N and Ag, and the codoped structure is stable and is more in favour of the formation of p-type ZnO.

关键词： first-principles co-doping ZnO electronic properties

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Influence of the chromium and ytterbium co-doping on the photoluminescence of zinc selenide crystals

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Journal of Rare Earths 2014年第10期32卷 938-945页

作者： I.Radevici Wihuri Physical Laboratory Department of Physics and AstronomyUniversity of Turku Faculty of Physics and Engineering Moldova State University

The luminescent properties of ZnSe, ZnSe：Cr（0.05 at.% Cr）, ZnSe：Yb（0.03 at.% Yb） and ZnSe：Cr：Yb（0.05 at.% Cr, 0.05 at.% Yb） crystals, doped during the growth process by the chemical vapor transport method, were studied within the temperature interval of 6–300 K. At the 6 K temperature in the visible spectral range 2 bands were observed： a band in the excitonic spectral region and a band of self-activated luminescence. It was shown that co-doping of zinc selenide crystals with the chromium and ytterbium led to the combination of the impurities influence on the photoluminescent properties. At the liquid helium temperature in the middle infrared range of the spectra of the ytterbium and chromium co-doped crystal a band with the maximum localized at 1.7μm was observed, which was overlapped with a complex band in the middle-IR spectral range, characteristic for the chromium doped ZnSe crystals. On the basis of obtained data an interaction mechanism of the chromium and ytterbium co-doping impurities was proposed. Guided by the existent model of the ytterbium ion incorporation in the selenide sublattice of the ZnSe crystals, an assumption about stabilization of single charged chromium ions in the zinc sublattice crystal nodes, by means of formation of the local charge compensating clusters, was made. It was assumed that the resonant energy transfer from one chromium ion to another,which led to the concentration quenching of the IR emission in the ZnSe：Cr PL spectra, would lead to the broadening of the IR emission in the spectra of ytterbium and chromium co-doped zinc selenide crystals.g

关键词： ZnSe luminescence co-doping defects Cr Yb rare earths

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A brief review of co-doping

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Frontiers of physics 2016年第6期11卷 81-101页

作者： Jingzhao Zhang Kinfai Tse Manhoi Wong Yiou Zhang Junyi Zhu Department of Physics the Chinese University of HonglKong Shatin N.T. Hong Kong 999077 China

Dopants and defects are important in semiconductor and magnetic devices. Strategies for controlling doping and defects have been the focus of semiconductor physics research during the past decades and remain critical even today. co-doping is a promising strategy that can be used for effectively tuning the dopant populations, electronic properties, and magnetic properties. It can enhance the solubility of dopants and improve the stability of desired defects. During the past 20 years, significant experimental and theoretical efforts have been devoted to studying the characteristics of co-doping. In this article, we first review the historical development of co-doping. Then, we review a variety of research performed on co-doping, based on the compensating nature of co-dopants. Finally, we review the effects of contamination and surfactants that can explain the general mechanisms of co-doping.

关键词： co-doping fully compensated partially compensated non-compensated unintentional \doping surfactant

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Effect of Ge–GeO_2 co-doping on non-ohmic behaviour of TiO_2–V_2O_5–Y_2O_3 varistor ceramics

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Journal of Semiconductors 2015年第7期36卷 39-44页

作者：康昆勇甘国友严继康易建宏张家敏杜景红赵文超荣雪全 Faculty of Materials Science and Engineering Kunming University of Science and Technology Key Laboratory of Advance Materials of Yunnan Province Key Laboratory of Advance Materials of Precious-Nonferrous Metals Ministry of Education

An investigation was made into the effect of doping with the elemental crystal Ge or/and GeO2 on the TiO2-V2O5-Y2O3 varistor ceramics. The result shows that as the doping contents of V2O5 and Y2O3 are 0.5 tool%, respectively, co-doping with 0.3 mol% Ge and 0.9 mol% GeO2 makes the highest α value （α = 12.8）, the lowest breakdown voltage Vlmg （VlmA = 15.8 V/ram） and the highest grain boundary barrier ФB （ФB = 1.48 eV）, which is remarkably superior to the TiO2-V2Os-Y203 varistor ceramics undoped with Ge and GeO2 and mono-doped with Ge or GeO2. The TiO2-V2Os-YEO3-Ge-GeO2 ceramic has the prospect of becoming a novel varistor ceramic with excellent electrical properties.

关键词： TiO2 varistor co-doping nonlinear coefficient breakdown voltage Ge and GeO2

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