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Serrated lithium fluoride nanofibers-woven interlayer enables uniform lithium deposition for lithium-metal batteries

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National Science Review 2022年第11期9卷 194-207页

作者： Shuangshuang Tan Yalong Jiang Shuyan Ni Hao Wang Fangyu Xiong Lianmeng Cui Xuelei Pan Chen Tang yaoguang rong Qinyou An Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology College of Materials Science and Engineering Chongqing University Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory

The uncontrollable formation of Li dendrites has become the biggest obstacle to the practical application of Li-metal anodes in high-energy rechargeable Li batteries. Herein, a unique LiF interlayer woven by millimeter-level, single-crystal and serrated LiF nanofibers(NFs) was designed to enable dendrite-free and highly efficient Li-metal deposition. This high-conductivity Li F interlayer can increase the Li+transference number and induce the formation of ’Li F–NFs-rich’ solid–electrolyte interface(SEI). In the ’Li F–NFs-rich’SEI, the ultra-long Li F nanofibers provide a continuously interfacial Li+transport path. Moreover, the formed Li–LiF interface between Li-metal and SEI film renders low Li nucleation and high Li+migration energy barriers, leading to uniform Li plating and stripping processes. As a result, steady charge–discharge in a Li//Li symmetrical cell for 1600 h under 4 m Ah cm-2and 400 stable cycles under a high area capacity of 5.65 mAh cm-2in a high-loading Li//rGO–S cell at 17.9 mA cm-2could be achieved. The free-standing LiF –NFs interlayer exhibits superior advantages for commercial Li batteries and displays significant potential for expanding the applications in solid Li batteries.

关键词： lithium fluoride serrated nanofibers LiF interlayer uniform Li deposition lithium-metal batteries

Inorganic A‑site cations improve the performance of band‑edge carriers in lead halide perovskites

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Frontiers of Optoelectronics 2023年第3期16卷 115-121页

作者： Cheng Wang yaoguang rong Ti Wang Key Laboratory of Artifcial Micro-and Nano-Structures of Ministry of Education School of Physics and TechnologyWuhan UniversityWuhan 430072China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China

In lead halide perovskites,organic A-site cations are generally introduced to fne-tune the *** of the questions under debate is whether organic A-site cations are essential for high-performance solar *** this study,we compare the band edge carrier dynamics and difusion process in MAPbBr_(3)and CsPbBr_(3)single-crystal *** transient absorption microscopy,the band-edge carrier difusion constants are *** the replacement of inorganic A-site cations,the difusion constant in CsPbBr_(3)increases almost 8 times compared to that in MAPbBr_(3).This work reveals that introducing inorganic A-site cations can lead to a much larger difusion length and improve the performance of band-edge carriers.

关键词： Perovskite Inorganic cations Carrier difusion

Influence of precursor concentration on printable mesoscopic perovskite solar cells

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Frontiers of Optoelectronics 2020年第3期13卷 256-264页

作者： Shuangquan JIANG Yusong SHENG Yue HU yaoguang rong Anyi MEI Hongwei HAN Michael Gratzel Center for Mesoscopic Solar Cells Wuhan National Laboratory for OptoelectronicsHuazhong University of Science and TechnologyWuhan 430074China

Over the last decade,the power conversion efficiency of hybrid organic-inorganic perovskite solar cells(PSCs)has increased dramatically from 3.8%to 25.2%.This rapid progress has been possible duc to the accurate control of the morphology and crystallinity of solution-processed perovskites,which are significantly affected by the concentration of the precursor *** study explores the influence of precursor concentrations on the performance of printable hole-conductor-free meso-scopic PSCs via a simple one-step drop-coating *** results reveal that lower concentrations lead to larger grains with inferior pore flling,while higher concentra-tions result in smaller grains with improved pore *** concentrations ranging from 0.241.20M,devices based on a moderate strength of 0.70M were confirmed to exhibit the best efficiency at 16.32%.

关键词： printable perovskite solar cell(PSC) precur-sor concentration crystallization morphology

Moisture-driven phase transition for improved perovskite solar cells with reduced trap-state density

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Nano Research 2017年第4期10卷 1413-1422页

作者： Swaminathan Venkatesan Fang Hao Junyoung Kim yaoguang rong Zhuan Zhu Yanliang Liang Jiming Bao Yan Yao Department of Electrical and Computer Engineering and Materials Science and Engineering Program University of Houston Houston Texas 77204 USA Texas Center for Superconductivity at the University of Houston Houston Texas 77204 USA

We report a mechanistic understanding of a moisture-driven intermediate-phase transition that improves the quality of perovskite thin films based on a lead-acetate precursor, improving the power-conversion effidency. We clarify the composition of the intermediate phase and attribute the transition of this phase to the hygroscopic nature of the organic product, i.e., methylammonium acetate. Thermal annealing aids in the coarsening of the grains. These decoupled processes result in better crystal formation with a lower spatial and energetic distribution of traps. Thermal annealing of the films without exposure to air results in a faster intermediate-phase transition and grain coarsening, which occur simultaneously, leading to disorder in the films and a higher deep trap-state density. Our results indicate the need for a humid environment for the growth of high-quality perovskite films and provide insight into intermediate-phase dissociation and conversion kinetics. Thus, they are useful for the large-scale production of effident solution-processed perovskite solar cells.

关键词： perovskite solar cells phase transition moisture treatment film growth

Monolithic all-solid-state dye-sensitized solar cells

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Frontiers of Optoelectronics 2013年第4期6卷 359-372页

作者： yaoguang rong Guanghui LIU Heng WANG Xiong LI Hongwei HAN Michael Gratzel Center for Mesoscopic Solar Cells Wuhan National Laboratory for Optoelectronics School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan 430074 China College of Materials Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China

As a low-cost photovoltaic technology, dye- sensitized solar cell （DSSC） has attracted widespread attention in the past decade. During its development to commercial application, decreasing the production cost and increasing the device stability take the most impor- tance. Compared with conventional sandwich structure liquid-state DSSCs, monolithic all-solid-state mesoscopic solar cells based on mesoscopic carbon counter electrodes and solid-state electrolytes present much lower production cost and provide a prospect of long-term stability. This review presents the recent progress of materials and achievement for all-solid-state DSSCs. In particular, representative examples are highlighted with the results of our monolithic all-solid-state mesoscopic solar cell devices and modules.

关键词： photovoltaic (PV) technology monolithic,dye-sensitized solar cells (DSSCs) all-solid-state meso-scopic carbon counter electrode

醋酸铅添加剂在印刷钙钛矿太阳能电池中的应用

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无机材料学报 2022年第2期37卷 197-203页

作者：明月胡玥梅安意荣耀光韩宏伟华中科技大学武汉光电国家研究中心武汉430074 深圳职业技术学院深圳518055

印刷钙钛矿太阳能电池采用无机介孔骨架包覆有机无机杂化钙钛矿材料的器件结构,制备工艺简单,原材料成本低廉,且稳定性优异。然而,在介孔骨架中均匀沉积高质量的钙钛矿材料存在一定困难。本研究通过在典型钙钛矿材料甲胺铅碘(MAPbI_(3)... 详细信息

印刷钙钛矿太阳能电池采用无机介孔骨架包覆有机无机杂化钙钛矿材料的器件结构,制备工艺简单,原材料成本低廉,且稳定性优异。然而,在介孔骨架中均匀沉积高质量的钙钛矿材料存在一定困难。本研究通过在典型钙钛矿材料甲胺铅碘(MAPbI_(3))前驱液中引入醋酸铅(Pb(Ac)_(2))作为添加剂,加快钙钛矿晶体的成核从而改善其在介孔骨架中的生长和填充。同时,Ac^(–)与MA^(+)所形成的MAAc在热退火过程中逃逸可使得所沉积的钙钛矿光活性层中PbI_(2)略微过量,达到钝化晶界的作用。添加摩尔分数1%Pb(Ac)_(2)的钙钛矿前驱液所制备的印刷钙钛矿太阳能电池的光电转换效率达到15.42%,表明引入添加剂调控钙钛矿光活性层结晶质量是提升印刷钙钛矿太阳能电池性能的有效途径。

关键词：有机无机杂化钙钛矿太阳能电池醋酸铅结晶调控成核生长

Empirical likelihood for spatial cross-sectional data models with matrix exponential spatial specification

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Applied Mathematics(A Journal of Chinese Universities) 2024年第1期39卷 125-139页

作者： LIU Yan rong Jian-rong QIN Yong-song Nanning University Nanning 530200China Center for Applied Mathematics of Guangxi and College of Mathematics and Statistics Guangxi Normal UniversityGuilin 541004China

In this paper,we study spatial cross-sectional data models in the form of matrix exponential spatial specification(MESS),where MESS appears in both dependent and error *** empirical likelihood(EL)ratio statistics are established for the parameters of the MESS *** is shown that the limiting distributions of EL ratio statistics follow chi-square distributions,which are used to construct the confidence regions of model *** experiments are conducted to compare the performances of confidence regions based on EL method and normal approximation method.

关键词： MESS empirical likelihood con dence region

Petrogenesis and Tectonic Significance of Shenxianshui Alkaline Granite in Gejiu,Yunnan Province,China

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Acta Geologica Sinica(English Edition) 2024年第2期98卷 368-385页

作者： YANG rong CHEN Yongqing School of Earth Sciences and Resources China University of GeosciencesBeijing 100083China

The Shenxianshui granites in the western Gejiu area were formed in the Late *** ablation inductively coupled plasma mass spectrometry indicates zircon U-Pb ages ranging from 90.67±0.7 to 85.97±0.6 *** intrusive rocks are peraluminous(A/CNK=1.03 to 1.33)and calc-alkaline,showing an affinity towards I-type *** ion lithophilic elements are enriched in K and Rb,while high field strength elements are ***,light rare earth elements are significantly enriched,showing a slight negative Eu anomaly(Eu/Eu^(*)=0.39 to 0.58).Shenxianshui granite has a relatively high initial Sr isotope ratio(^(87)Sr/^(86)Sr)_(i)(0.7098-0.7105),negative ε_(Nd)(t)values(−7.99 to−7.44)and negative ε_(Hf)(t)values(−8.37 to−2.58).Combined with previous studies,these characteristics suggest that the Shenxianshui alkaline granites were formed in a post-collision extensional *** alkaline granitic magma possibly originated from the partial melting of the lower crust during the Mesoproterozoic era and may have contained mantle source *** alkaline granite was formed from mixed magma with a high degree of crystal *** abundance of ore-forming elements indicates that Shenxianshui granite has the potential to mineralize key metals and rare earth elements.

关键词： I-type granite zircon U-Pb geochronology Sr-Nd-Pb isotopes Hf isotope Gejiu

Small Cycles Property of Some Cremer Rational Maps and Polynomials

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Chinese Annals of Mathematics,Series B 2024年第1期45卷 123-136页

作者： rong FU Ji ZHOU Faculty of Science Yibin UniversityYibin 644000SichuanChina Department of Mathematical Sciences Sichuan Normal UniversityChengdu 610066China

This paper concerns the linearization problem on rational maps of degree d≥2 and polynomials of degree d>2 from the perspective of *** authors introduce a set l_(∞) of irrational numbers and show that if α∈l_(∞),then any rational map is not linearizable and has infinitely many cycles in every neighborhood of the fixed point with multiplier λ=e^(2πiα),Adding more constraints to cubic polynomials,they discuss the above problems by polynomial-like *** the family of polynomials,with the help of Yoccoz's method,they obtain its maximum dimension of the set in which the polynomials are non-linearizable.

关键词： Irrationally indifferent fixed point Linearization problem Small cycles property