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Anti-Solvent-Free Preparation for Efficient and Photostable Pure-Iodide Wide-Bandgap Perovskite Solar Cells

Angewandte Chemie 2024年第17期136卷

作者： Ting Nie Zhimin Fang Tinghuan Yang Prof. Kui Zhao Prof. Jianning Ding Prof. Shengzhong (Frank) Liu Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University 710119 Xi'an China Institute of Technology for Carbon Neutralization Yangzhou University 225127 Yangzhou China Dalian National Laboratory for Clean Energy iChEM Dalian Institute of Chemical Physics Chinese Academy of Sciences 116023 Dalian China

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Layer-Dependent Pressure Effect on the Electronic Structure of 2D Black Phosphorus

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Physical Review Letters 2021年第18期127卷 186401-186401页

作者： Shenyang Huang Yang Lu Fanjie Wang Yuchen Lei Chaoyu Song Jiasheng Zhang Qiaoxia Xing Chong Wang Yuangang Xie Lei Mu Guowei Zhang Hao Yan Bin Chen Hugen Yan State Key Laboratory of Surface Physics Key Laboratory of Micro- and Nano-Photonic Structures (Ministry of Education) and Department of Physics Fudan University Shanghai 200433 China Center for High Pressure Science & Technology Advanced Research Shanghai 201203 China Institute of Flexible Electronics Northwestern Polytechnical University Xi’an 710072 China CAS Key Laboratory of Experimental Study under Deep-sea Extreme Conditions Institute of Deep-Sea Science and Engineering Chinese Academy of Sciences Sanya 572000 China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093 China

Through infrared spectroscopy, we systematically study the pressure effect on electronic structures of few-layer black phosphorus (BP) with layer number ranging from 2 to 13. We reveal that the pressure-induced shift of optical transitions exhibits strong layer dependence. In sharp contrast to the bulk counterpart which undergoes a semiconductor to semimetal transition under ∼1.8 GPa, the band gap of 2 L increases with increasing pressure until beyond 2 GPa. Meanwhile, for a sample with a given layer number, the pressure-induced shift also differs for transitions with different indices. Through the tight-binding model in conjunction with a Morse potential for the interlayer coupling, this layer- and transition-index-dependent pressure effect can be fully accounted. Our study paves a way for versatile van der Waals engineering of two-dimensional BP.

关键词： Electronic structure Pressure effects 2-dimensional systems Infrared spectroscopy Raman spectroscopy Tight-binding model

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Vacancy engineering tailoring bismuth molybdate with improved haloperoxidase-like activity for antibacterial applications

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Colloids and surfaces A: Physicochemical and engineering Aspects 2025年 724卷

作者： Xueling Zhu Ding Guo Jinkai Zhang Rongrong Chen Jun Wang Jizhou Duan Key Laboratory of Superlight Materials and Surface Technology Ministry of Education College of Materials Science and Chemical Engineering Harbin Engineering University Harbin 150001 China State Key Laboratory of Advanced Marine Materials Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China University of Chinese Academy of Sciences 19 Yuquan Road Beijing 100039 China

Biofouling on marine equipment is a significant worldwide issue causing environmental harm and economic losses. Drawing inspiration from the natural defense mechanisms of marine algae, an innovative oxygen vacancy engineering strategy is presented to develop advanced haloperoxidase-like based on bismuth molybdate (OVs-BMO). The critical need for interfacial activity modulation is achieved through deliberate vacancy engineering, creating abundant oxygen vacancies and increasing specific surface area that serve as both catalytic active sites and surface charge modulation centers. The engineered OVs-BMO nanozymes demonstrate remarkable catalytic activity, with a bromination reaction rate of 0.15 µM min⁻¹ at a concentration of 0.05 mg mL −1 , which represents a 36-fold enhancement in efficiency compared to pristine bismuth molybdate (BMO). The breakthrough in haloperoxidase-like activity stems from our precisely controlled vacancy architecture and increased specific surface area that optimizes: surface electron density redistribution, reactive oxygen species generation efficiency, substrate adsorption-desorption dynamics and surface-active site number. Moreover, under natural seawater conditions, OVs-BMO exhibits significant antibacterial effectiveness against various bacterial strains. Exposure to low concentrations of H 2 O 2 at 25 μM, 350 μM, and 100 μM results in notable bacterial inhibition rates of 80 %, 91 %, and 92 % against E. coli , S. aureus , and P. aeruginosa , respectively. The interfacial engineering strategy presented provides a novel paradigm for designing marine antifouling materials that combine enzymatic catalysis with physical anti-adhesion mechanisms, offering significant potential for sustainable ocean technology development.

关键词： Ocean engineering

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A Novel Low-Cost High-Strength Β Titanium Alloy Microstructure Evolution and Mechanical Behavior

SSRN

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SSRN 2022年

作者： Li, C.C. Xin, Chao Wang, Qi Ren, Junqiang Zhao, B. Wu, J.P. Pan, X.L. Lu, Xuefeng State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals School of Materials Science and Engineering Lanzhou University of Technology Lanzhou730050 China Xi'an Rare Metal Materials Institute Co. Ltd Shaanxi Xi'An710016 China School of Energy Engineering Huanghuai University Zhumadian463000 China Xi’an Surface Material Protection Co. Ltd. Xi'An710200 China

A novel metastable β-titanium alloy (Ti-4.8Al-5.6Mo-3V-1.5Cr-1.6Fe) with low-cost and high-strength was designed using the d-electron theory approach. A multiscale structure composing of β matrix, primary αp (volume fraction of 21%) and the precipitates αs were obtained after solution at 780 °C and aging at 470, 500, and 530 °C. The density and average spacing of precipitates were dependence of the aging temperature. The dense αs with the average spacing (λ) less than 100 nm were precipitated aging at 470 °C due to the greater driving force for formation of αs. In contrast, the coarse αs with the average spacing (λ) greater than 100 nm were precipitated aging at 530 °C due to the greater driving force for growth of αs. The tensile properties were also sensitive to the density and spacing precipitates αs inside the β matrix. A tensile strength ranging from 1512 MPa to 1648 MPa and tensile elongation ranging from 1.8% to 7.8% were reported by controlling the density and average spacing of precipitates αs inside the β matrix. Particularly, an excellent combination of high tensile strength (1512 MPa) and relatively high elongation (7.8%) was obtained by aging at 530 °C. © 2022, The Authors. All rights reserved.

关键词： Titanium alloys

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Enhancing the high-cycle fatigue performance of GH4169 alloy by eliminating structural stress concentration through high-energy impact composite modification

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Fundamental Research 2025年

作者： Qiang Wang Guoxin Lu Ayder Nabiev Oday I. Abdullah Zhong Ji Zhong Chen Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material AECC Beijing Institute of Aeronautical Materials Beijing 100095 China MOE Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Shandong University Jinan 250061 China Institute of Mechanics and Seismic Stability of Structures of the Academy of Sciences of the Republic of Uzbekistan Department of Theory of Mechanisms and Machines Tashkent 100125 Uzbekistan Department of Energy Engineering College of Engineering University of Baghdad Baghdad Iraq Jiangsu Key Laboratory of Advanced Manufacturing Technology Huaiyin Institute of Technology Huai’an 223001 China

Despite the advancements of traditional surface treatments like shot peening (SP) and laser shock peening (LSP) in enhancing the fatigue life of GH4169 superalloy, these techniques remain limited, particularly under high-stress concentration conditions. This study introduces a novel high-energy impact composite modification method that integrates SP and LSP to comprehensively address the fatigue strength sensitivity to stress concentration, a persistent issue for GH4169 in high-cycle fatigue applications. For the modified specimens, the fatigue limit under high-stress concentration conditions of Kt  = 3 increased from 215 MPa to 517 MPa, more than doubling. Compared to grinding, composite modification shifts fatigue crack initiation from the surface to subsurface regions, demonstrating superior fatigue resistance. The high-intensity surface modification eliminates structural stress concentration as the primary factor determining the fatigue life of the material. The concentrated stress at the carbide phase interfaces within the material, which cannot be sufficiently weakened by residual compressive stress, becomes the new weak point. The study concludes that high-energy impact composite modification offers a viable method to enhance the durability and performance of GH4169 superalloys in demanding applications.

关键词： High-energy modification GH4169 Residual stress High-cycle fatigue

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Color Tunable (Ba,Ca)Sco2f:Eu2+, Bi3+, K+ Perovskite with Dependence of Excitation Wavelength for a Dvanced Anti-Counterfeiting Application

SSRN

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SSRN 2022年

作者： Cai, Mingsheng Lang, Tianchun Fang, Shuangqiang Han, Tao Valiev, Damir You, Houjiang Liu, Chong Yu, Jing Zhou, Wei Su, Peng Jing, Xiaolong Liu, Bitao Polisadova, Elena F. Chongqing Key Laboratory of Materials Surface & Interface Science Research Institute for New Materials Technology Chongqing University of Arts and Sciences Chongqing402160 China School of Advanced Manufacturing Technologies National Research Tomsk Polytechnic University Tomsk634050 Russia College of Optical and Electronic Technology China Jiliang University Hangzhou310018 China College of Materials Science and Engineering Key Laboratory of Advanced Materials of Yunnan Province Kunming University of Science and Technology Kunming650093 China T.F. Gorbachev Kuzbass State Technical University 28 Vesennyaya Street Kemerovo650000 Russia Hunan Agricultural University China

Fluorescent materials are widely used for anti-counterfeiting of information security and commodities. However, the increasing requirements for fluorescent anti-counterfeiting technology urgently require the development of novel fluorescent materials with multicolor fluorescence, single component, and excellent stability. Herein, a color tunable Ba0.94Ca0.06ScO2F:Eu2+, Bi3+, K+ perovskite with dependence of excitation wavelength for high-level anti-counterfeiting is reported. The fluorescence spectra of Ba0.94Ca0.06ScO2F:Eu2+, Bi3+, K+ perovskite show the tunable emission band with the peak between 479 and 509 nm. It is worth noting that the peak intensity ratio at 479 and 509 nm changes with the dependence of the excitation wavelength. Meanwhile, the snowflake pattern is designed to demonstrate the potential applications in anti-counterfeiting, which obviously shows four different color patterns when irradiated by sunlight, 320 360, and 415 nm excitation, respectively. Moreover, Ba0.94Ca0.06ScO2F:Eu2+, Bi3+, K+ perovskite shows a high efficient and excellent stability, which indicates that it is a promising fluorescent anti-counterfeiting material. © 2022, The Authors. All rights reserved.

关键词： Perovskite

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Microstructures and mechanical properties of Ti3Al/Ni-based superalloy joints brazed with AuNi filler metal

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Journal of Materials Science & technology 2019年第9期35卷 2070-2078页

作者： H.S. Ren H.P.Xiong W.M. Long B. Chen Y.X. Shen J. Pang Welding and Plastic Forming Division Beijing Institutes of Aeronautical MatericalBeijing 100095China State Key Laboratory of Advanced Brazing Filler Metals and Technology Zhengzhou Research Institute of Mechanical EngineeringZhengzhou 450001 China Department of Material Science and Engineering Beihang UniversityBeijing 100191China

For the purpose of high-temperature service and the weight reduction in aviation engineering applications, the dissimilar joining of Ti3Al-based alloy to Ni-based superalloy (GH536) was conducted using Au-17.5Ni (wt%) brazing filler metal. The microstructure and chemical composition at the interfaces were investigated by scanning electron microscope, X-ray diffraction and transmission electron microscope. The diffusion behaviors of elements were analyzed as well. The results indicated that the Ti3Al/GH536 joint microstructure was characterized by multiple layer structures. Element Ni from Au-Ni filler metal reacted with Ti3Al base metal, leading to the formation of AlNi2Ti and NiTi compounds. Element Ni from Ti3Al base metal reacted with Ni and thus Ni3Nb phase was detected in the joint central area. Due to the dissolution of Ni-based superalloy,(Ni,Au) solid solution ((Ni,Au)ss) and Ni-rich phase were visible adjacent to the superalloy side. The average tensile strength of all the joints brazed at 1253 K for 5-20 min was above 356 MPa at room-temperature. In particular, the joints brazed at 1253 K/15 min presented the maximum tensile strength of434 MPa at room-temperature, and the strength of 314 MPa was maintained at 923 K. AlNi2Ti compound resulted in the highest hardness area and the fracture of the samples subjected to the tensile test mainly occurred in this zone.

关键词： Ti3Al-based alloy Ni-based superalloy Brazing Microstructure Tensile strength

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Acousto-drag photovoltaic effect by piezoelectric integration of two-dimensional semiconductors

arXiv

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arXiv 2023年

作者： Gu, Jiaming Mou, Yicheng Ma, Jianwen Chen, Haonan Zhang, Chuanxin Wang, Yuxiang Wang, Jiayu Guo, Hangwen Shi, Wu Yuan, Xiang Jiang, Xue Ta, Dean Shen, Jian Zhang, Cheng State Key Laboratory of Surface Physics Institute for Nanoelectronic Devices and Quantum Computing Fudan University Shanghai200433 China Center for Biomedical Engineering School of Information Science and Technology Fudan University Shanghai200433 China Zhangjiang Fudan International Innovation Center Fudan University Shanghai201210 China Shanghai Qi Zhi Institute Shanghai200232 China State Key Laboratory of Precision Spectroscopy East China Normal University Shanghai200241 China School of Physics and Electronic Science East China Normal University Shanghai200241 China Collaborative Innovation Center of Advanced Microstructures Nanjing210093 China

Light-to-electricity conversion is crucial for energy harvesting and photodetection, requesting efficient electron-hole pair separation to prevent recombination. Traditional junction-based mechanisms using built-in electric fields fail in non-barrier regions. Homogeneous material harvesting under photovoltaic effect is appealing but only realized in non-centrosymmetric systems via bulk photovoltaic effect. Here we report the realization of photovoltaic effect by employing surface acoustic waves (SAW) to generate zero-bias photocurrent in a conventional layered semiconductor MoSe2. SAW induces periodic modulation to electronic bands and drags the photoexcited pairs toward the travelling direction. The photocurrent is extracted by a local barrier. The separation of generation and extraction processes suppresses recombination and yields large nonlocal photoresponse. We distinguish acousto-electric drag and electron-hole pair separation effect by fabricating devices of different configurations. The acousto-drag photovoltaic effect, enabled by piezoelectric integration, offers an efficient light-to-electricity conversion method, independent of semiconductor crystal symmetry. © 2023, CC BY.

关键词： Energy harvesting

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Superconductivity in pressurized trilayer La4Ni3O10-δ single crystals

arXiv

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arXiv 2023年

作者： Zhu, Yinghao Peng, Di Zhang, Enkang Pan, Bingying Chen, Xu Chen, Lixing Ren, Huifen Liu, Feiyang Hao, Yiqing Li, Nana Xing, Zhenfang Lan, Fujun Han, Jiyuan Wang, Junjie Jia, Donghan Wo, Hongliang Gu, Yiqing Gu, Yimeng Ji, Li Wang, Wenbin Gou, Huiyang Shen, Yao Ying, Tianping Chen, Xiaolong Yang, Wenge Cao, Huibo Zheng, Changlin Zeng, Qiaoshi Guo, Jiangang Zhao, Jun State Key Laboratory of Surface Physics Department of Physics Fudan University Shanghai200433 China Shanghai Research Center for Quantum Sciences Shanghai201315 China Shanghai201203 China College of Physics and Optoelectronic Engineering Ocean University of China Shandong Qingdao266100 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100190 China Neutron Scattering Division Oak Ridge National Laboratory Oak RidgeTN37831 United States Center for High Pressure Science and Technology Advanced Research Shanghai201203 China School of Physical Sciences University of Chinese Academy of Sciences Beijing100049 China Center for High Pressure Science and Technology Advanced Research Beijing100094 China State Key Laboratory of ASIC and System School of Microelectronics Fudan University Shanghai China Institute of Nanoelectronics and Quantum Computing Fudan University Shanghai200433 China Shanghai Branch Hefei National Laboratory Shanghai201315 China

The pursuit of discovering new high-temperature superconductors that diverge from the copper-based paradigm1-3 carries profound implications for elucidating mechanisms behind superconductivity and may also enable new applications4-8. Here, our investigation reveals that application of pressure effectively suppresses the spin and charge order in trilayer nickelate La4Ni3O10-δ single crystals, leading to the emergence of superconductivity with a maximum critical temperature (Tc) of around 30 K at 69.0 GPa. The DC susceptibility measurements confirm a substantial diamagnetic response below Tc, indicating the presence of bulk superconductivity with a volume fraction exceeding 80%. In the normal state, we observe a "strange metal" behavior, characterized by a linear temperature-dependent resistance extending up to 300 K. Furthermore, the layer-dependent superconductivity observed hints at a unique interlayer coupling mechanism specific to nickelates, setting them apart from cuprates in this regard. Our findings provide crucial insights into the fundamental mechanisms underpinning superconductivity, while also introducing a new material platform to explore the intricate interplay between the spin/charge order, flat band structures, interlayer coupling, strange metal behavior and high-temperature superconductivity. © 2023, CC BY-NC-ND.

关键词： Single crystals

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Quantifying Soil Erosion Attribution in Inner Mongolia's Desert Grassland

SSRN

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SSRN 2023年

作者： Jiang, Hongtao Gao, Wenbang Liu, Baoyuan Guo, Qiankun College of Geographical Science Inner Mongolia Normal University Hohhot010022 China Inner Mongolia Autonomous Region Land Use and Renovation Engineering Technology Research Center Inner Mongolia Hohhot010022 China Laboratory of Mongolian Plateau Environment & Global Change Inner Mongolia Hohhot010022 China Advanced Institute of Natural Sciences State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal University Zhuhai519087 China China Institute of Water Resources and Hydropower Research Beijing100048 China

Wind erosion represents a critical ecological issue in the desert grassland region of Inner Mongolia, China. This study's objective is to delve into the scientific understanding of wind erosion patterns and to strategically plan appropriate control measures in areas prone to wind erosion. Despite the urgency, existing research predominantly focuses on isolated or single-category factors influencing wind erosion, with a conspicuous deficiency in comprehensive evaluations. To bridge this research gap, this study meticulously assembled and structured 21 indicators related to wind erosion within the desert grassland region of Inner Mongolia, subsequently formulating a corresponding spatial distribution dataset. Employing a geographic detector method, an in-depth quantitative assessment of each factor's relative contribution to wind erosion was conducted, alongside the precise identification of varying degrees of risk zones. The research findings indicate that: 1) wind erosion in Inner Mongolia's desert grassland area exhibits a pronounced spatial distribution, with higher intensity in the north and lower in the south, a pattern that aligns with the spatial tendencies of most influencing factors;2) among the indicators, Soil Organic Matter (SOM), Vegetation Height (VH), average annual Precipitation (PPT), average annual temperature, and potential evapotranspiration emerged as principal contributors to wind erosion, with their interplay further exacerbating the erosion severity;3) the investigation pinpoints the specific distribution of risk zones, characterized by differing hazard levels, generally revealing a more pronounced wind erosion threat in the northern regions compared to the south. In conclusion, the insights gleaned from this research are paramount for enhancing scientific knowledge on wind erosion trends in desert grassland locales, accurately pinpointing the predominant factors that contribute to wind erosion, and strategically devising targeted wind erosion

关键词： Erosion

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