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Ultra-smooth CsPbI_(2)Br film via programmable crystallization process for high-efficiency inorganic perovskite solar cells

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Journal of Materials Science & Technology 2021年第7期66卷 150-156页

作者： Fu Zhang Zhu Ma Taotao hua Rui Liu Qiaofeng wu Yu yue hua Zhang Zheng Xiao Meng Zhang Wenfeng Zhang Xin Chen hua Yu Institute of Photovoltaics Southwest Petroleum UniversityChengdu610500China Center for Computational Chemistry and Molecular Simulation College of Chemistry and Chemical EngineeringSouthwest Petroleum UniversityChengdu610500China

CsPbI_(2)Br is an ideal inorganic perovskite material with a reasonable bandgap for solar cell applications because of its advantage of superior thermal and phase stability. However, the performance of CsPbI2Br based solar cells highly relied on the perovskite crystallization process along with the interfacial contact engineering process between CsPbI_(2)Br perovskite and charge-transporting layers. In this work, a programmable crystallization method is developed to obtain ultra-smooth CsPbI_(2)Br perovskite film with a well-engineered contact interface in perovskite solar cells. This method combines a pre-stand-by process with a programmable gradient thermal engineering process, which mediates the crystal growth dynamics process of CsPbI2Br perovskite by controlling the release of dimethyl sulfoxide(DMSO) from its coordinates with the perovskite film, leading to high-quality CsPbI_(2)Br film with large-scale crystalline grains, reduced surface roughness, and low trap density. Fabricated perovskite devices based on CsPbI_(2)Br film obtained by this method deliver power conversion efficiency of 14.55 %;meanwhile, the encapsulated CsPbI_(2)Br perovskite device achieves a maximum efficiency of 15.07 %. This decent solar conversion efficiency demonstrates the effectiveness of the programmable crystallization method used in this work,which shows great potential as a universal approach in obtaining high-quality CsPbI_(2)Br perovskite films for fabricating high-efficiency inorganic perovskite solar cells.

关键词： CsPbI_(2)Br Ultra-smooth morphology Interface Crystallization Inorganic perovskites

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ON THE CONVERGENCE OF IMPLICIT DIFFERENCE SCHEMES FOR HYPERBOLIC CONSERVATION LAWS

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Journal of Computational Mathematics 2002年第2期20卷 121-128页

作者： hua-zhong Tang hua-mo wu School of Mathematical Sciences Peking UniversityBeijing 100871China LSEC ICMSECAcademy of Mathematics and System SciencesChinese Academy of SciencesBeijing 100080China

Discusses the treatment of implicit difference approximations to hyperbolic conservation laws with non-convex flux. Information on weighted implicit difference schemes; Convergence of difference scheme; Establishment ... 详细信息

关键词： conservation laws weighted implicit schemes entropy solution

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Cyclin A-Cdk2 Phosphorylates BH3 only Protein Bad in vitro and in vivo

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Chemical Research in Chinese Universities 2007年第5期23卷 567-570页

作者： HE Kan CHEN yue LI Jing-hua ZHAN Zhuo wu Yong-ge KONG Wei JIN Ying-hua Vaccine Research Center College of Life Science Key Laboratory for Supramolecular Structure ＆ Materials of Ministry of Education School of Public Health Jilin University Changchun 130012 P. R. China

Increasing evidence suggests that Cyclin A-Cdk2 activity is required in the apoptosis process induced by various *** determine a specific substrate of Cyclin A-Cdk2 for apoptosis,in this study,we carried out an in vitro kinase assay using immunoprecipitated complex Cyclin A-Cdk2 as an enzyme source,and recombinant protein GST-Bad as a *** study showed that Bad was clearly phosphorylated by Cyclin A-Cdk2 in *** examine whether protein Bad can also be phosphorylated by Cyclin A-Cdk2 kinase in vivo,we transiently overexpressed protein Bad with Cyclin A or Cdk2-dn,a dominant negative version of Cdk2,in Hela cells and determined the phosphorylation status of protein *** test showed that protein Bad was clearly phosphorylated in Cyclin A overexpressed cells,but not in Cdk2-dn or mock ***,etoposide also caused the phosphorylation of endogenetic *** conclusion,here we provide first time evidence that protein Bad can be a substrate of Cyclin A-Cdk2 apoptosis for in vitro and in vivo.

关键词： Apoptosis Bad Cyclin A-Cdk2 Phosphorylation Substrate

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Stable expression of Arabidopsis vacuolar Na^+/H^+ antiporter gene AtNHX1,and salt tolerance in transgenic soybean for over six generations

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Chinese Science Bulletin 2010年第12期55卷 1127-1134页

作者： LI TianXing ZHANG yue LIU hua wu YuTing LI WenBin ZHANG HongXia College of Life Sciences Yunnan University Kunming 650091 China National Key Laboratory of Plant Molecular Genetics Shanghai Institute of Plant Physiology and Ecology Shanghai Institutes for Biological Sciences Chinese Academy of Sciences Shanghai 200032 China Key Laboratory of Soybean Biology in Chinese Education Ministry Northeast Agricultural University Harbin 150030 China

The Arabidopsis vacuolar Na+/H+ antiporter gene,AtNHX1,was introduced into soybean by Agrobacterium-mediated *** independent kanamycin resistant lines were *** result of PCR,Southern blotting and Northern blotting analyses demonstrated that the AtNHX1 gene was successfully inserted into the soybean genome and stably expressed in these kanamycin resistant *** stability of AtNHX1 expression and salt resistance were evaluated in the soybean transformants for over 6 *** independently derived transgenic lines with high expression level of AtNHX1 were selected,and propagated to generation T5 in the absence of selection *** and RT-PCR examinations revealed that AtNHX1 was highly expressed in all investigated transgenic T5 ***,all transgenic T5 plants showed resistant to salt stress,same as those of homozygous T2 *** together,our results indicated that constitutive expression of AtNHX1 enhanced salt tolerance in soybean for over 6 generations,suggesting a great potential use of AtNHX1 for improving salt tolerance in plants by genetic engineering.

关键词：转基因大豆稳定表达蛋白基因逆向转运耐盐性液泡膜拟南芥 Northern杂交

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Gelation of polymeric nanoparticles

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Particuology 2014年第3期12卷 1-11页

作者： hua wu Massimo Morbidelli Institute for Chemical and Bioengineering.Department of Chemistry and Applied Biosciences ETH Zurich8093 ZurichSwitzerland

We review how, starting from polymeric nanoparticles, to generate clusters of fractal morphology and to expand the entire space and interconnect to form gels, through either Brownian motion or intense shear-induced aggregation. In the case of Brownian motion-induced gelation, specific techniques developed to obtain uniform structure of gels under both reaction-limited and diffusion-limited cluster aggregation conditions have been described. In the case of intense shear-induced gelation as a newly developed technique, our focus is on its principle, theoretical development and advantages with respect to Brownian motion-induced gelation in practical applications. We consider gelation of both rigid and soft particles. As a physical process, the bonding between the particles within gels is owed to van der Waals attractions, thus being easily broken. However, in the case of soft particles that can coalesce upon contact, the coalescence can allow the particles to stick together forming permanent gels. In this case, the gel structure can be controlled by controlling the degree of coalescence. Techniques used to control the degree of coalescence have also been described.

关键词： Structured material Fractal Gelation Gel Polymer

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Rapid Synthesis of Glycosyl Bromides by Ultrasound Irradiation

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Chemical Research in Chinese Universities 2013年第1期29卷 71-75页

作者： ZHAO Jin-zhong ZHANG Xue-qin wu Xin XING Ze-bing yue Ai-qin SHAO hua-wu Shanxi Agricultural University Taigu 030801 P. R. China Natural Products Research Center Chengdu Institute of Biology Chinese Academy of Sciences Chengdu 610041 P R. China

A convenient and environmentally friendly reactor for the synthesis of glycosyl bromides via ultrasound irradiation was designed. Peracetylated glycosyl bromides were synthesized from free saccharides by means of a one-pot method. Benzoylated and 6-subsituted glycosyl bromides were prepared from protected saccharides. The glycosyl bromides were obtained in isolated yields of 83% to 96%.

关键词： Ultrasound Glycosyl bromide Acetyl bromide Reactor Sugar

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Effects of Current Frequency on the Microstructure and Wear Resistance of Ceramic Coatings Embedded with SiC Nano-particles Produced by Micro-arc Oxidation on AZ91D Magnesium Alloy

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Journal of Materials Science & Technology 2010年第10期26卷 865-871页

作者： yue Yang and hua wu Key Laboratory of Advanced Structural Materials,Ministry of Education,Changchun University of Technology,Changchun 130012,China Key Laboratory of Advanced Structural Materials Ministry of Education Changchun University of Technology Changchun 130012 China

To improve the surface wear resistance of the ceramic coating fabricated by micro-arc oxidation （MAO） on AZ91D magnesium alloy,ceramic coatings embedded with SiC nano-particles at different current frequency （500 Hz,700 Hz,and 900 Hz） were produced during the MAO *** morphology and phase composition of the coatings were investigated by scanning electron microscopy （SEM）,field emission scanning electron microscopy （FESEM）,and X-ray diffraction （XRD）.The surface roughness of the coatings was characterized by confocal laser scanning microscopy （CLSM）.Simultaneously,the tribological properties of the composite coatings were evaluated by using a universal materials tester （UMT）.The results shows that the wear resistance of the ceramic coatings with SiC nano-particles was improved significantly compared to the ceramic coatings without SiC ***,the composite coating formed at current frequency 900 Hz showed the better wear resistance than the others.

关键词： Magnesium alloy Micro-arc oxidation SiC nano-particles Wear resistance

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Template-free preparation of porous Co microfibers from spent lithium-ion batteries as a promising microwave absorber

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Rare Metals 2022年第10期41卷 3475-3485页

作者： Xiao-Min wu Fei Xie Yong-Lin Yao yue Sun Zhong-Sheng hua Zhuo Zhao Yong-Xiang Yang Anhui Province Key Laboratory of Metallurgical Engineering&Resources Recycling School of Metallurgical EngineeringAnhui University of TechnologyMaanshan243002China Department of Materials Science and Engineering Delft University of TechnologyDelft2628CDNetherlands

In order to take full advantage of the secondary resources,in this paper,we reported a template-free process to prepare porous Co microfibers from spent lithiumion batteries(LIBs).First,the waste LiCoO_(2) powders were leached by oxalic acid at a suitable temperature,and rodlike cobalt oxalate powders were ***,the porous Co microfibers were prepared by using the cobalt oxalate as precursors through a thermal decomposition at420 ℃ under nitrogen *** prepared Co microfibers possess diameters of 1-2 μm,and each microfiber consists of small particles with size of100-200 *** Co microfibers(25 wt%)/paraffin composite exhibited excellent microwave absorption *** the sample thickness is 4.5 mm,the reflection losses reach-36.14 and-38.20 dB at 4.16 and 17.60 GHz,respectively,and the effective bandwidth reaches up to 5.52 *** indicates that the Co microfibers can be used as a promising microwave ***,this paper demonstrates a novel process to make a high value-added product through recycling from the spent lithium-ion *** addition,it is advantageous to eliminate the hazard of spent lithium-ion batteries and electromagnetic radiation to environment and human health.

关键词： Spent lithium-ion batteries(LIBs) Co microfibers Recycling Oxalic acid leaching Microwave absorption

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Subsurface deformation mechanism and the interplay relationship between strength–ductility and fretting wear resistance during fretting of a high-strength titanium alloy

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Friction 2024年第10期12卷 2259-2280页

作者： Yanlin TONG Ke hua Haoyang XIE yue CAO Zhuobin huaNG Zhenpeng LIANG Xiaolin LI Hongxing wu Haifeng WANG State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi’an 710072China

Fretting wear damage of high-strength titanium fasteners has caused a large number of disastrous ***,it is believed that both high strength and excellent ductility can reduce fretting wear ***,whether strength and ductility are contradictory or not and their appropriate matching strategy under the external applied normal stress(Fw)are still confusing ***,by analyzing the subsurface-microstructure deformation mechanism of several samples containing variousαprecipitate features,for the first time,we design strategies to improve fretting damage resistance under different matching relation between Fw and the tensile strength of materials(Rm).It is found that when Fw is greater than Rm or Fw is nearly equivalent to Rm,the deformation mechanism mainly manifests as serious grain fragmentation ofβandαGB *** deformation in large areas only reduces damage to a limited *** is crucial to improve the strength to resist cracking and wear,but it is of little significance to improve the ***,when Fw is far less than Rm,coordinated deformation ability reflected by ductility plays a more important *** deformation mechanism mainly manifests as localized deformation ofβandαGB constituents(kinking induced by twinning and spheroidizing).A unique composite structure of nano-grained/lamellar layer and localized deformation transition layer reduces fretting damage by five times compared with a single nanograined *** when the strength is great enough,improving the plasticity can reduce *** study can provide a principle for designing fretting damage resistant alloys.

关键词： fretting wear high-strength titanium alloy microstructures subsurface deformation

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Matched MnO@C anode and porous carbon cathode for Li-ion hybrid supercapacitors

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Rare Metals 2023年第6期42卷 1959-1968页

作者： Cui-hua An yue-Qing Li Shuai wu Ling-Xiao Gao Li-Yang Lin Qi-Bo Deng Ning Hu Key Laboratory of Hebei Province on Scale-Span Intelligent Equipment Technology and School of Mechanical EngineeringHebei University of TechnologyTianjin300401China wuhan Green Power Hydrogen Energy Technology Co. LTDWuhan430000China The Green Aerotechnics Research Institute of Chongqing Jiaotong University Chongqing401120China State Key Laboratory of Reliability and Intelligence Electrical Equipment Hebei University of TechnologyTianjin300130China Institute of Materials Physics and Technolgy Hamburg University of TechnologyHamburg21073Germany

Holding a promise of achieving high power and energy densities,Li-ion hybrid electrochemical capacitors present a crucial future direction for energy storage ***,technical challenges remain to appropriately couple both high-power capacitor-type and high-energy battery-type electrode materials within a same *** addition,the current electrode materials in the device are usually prepared separately,which leads to lengthy preparation,time-consuming and *** this work,we report a simple method to prepare porous carbon materials(PC) with and without MnO nanoparticle cores,which function as very unique anode/cathode pairs for very high-performance Li ion hybrid *** the respective merits of high Li storage capacity from the MnO@C anode and high-rate performance from the PC cathode,the resulted device exhibits a remarkable energy density of 89 Wh·kg^(-1)(at 48 W·kg^(-1)) and can reach a battery-inaccessible power density of 18 kW·kg^(-1)(at 45Wh·kg^(-1)).

关键词： Li-ion hybrid supercapacitors Structural affinity MnO@C Porous carbon(PC) High energy density

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