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High performance sandwich structured Si thin film anodes with LiPON coating

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Frontiers of Materials Science 2018年第2期12卷 147-155页

作者： Xinyi LUO Jialiang LANG shasha lv Zhengcao LI State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing 100084 China Key Laboratory of Advanced Materials (MOE) School of Materials Science and Engineering Tsinghua University Beijing 100084 China

The sandwich structured silicon thin film anodes with lithium phosphorus oxynitride （LiPON） coating are synthesized via the radio frequency magnetron sputtering method, whereas the thicknesses of both layers are in the nanometer range, i.e. between 50 and 200 nm. In this sandwich structure, the separator simultaneously functions as a flexible substrate, while the LiPON layer is regarded as a protective layer. This sandwich structure combines the advantages of flexible substrate, which can help silicon release the compressive stress, and the LiPON coating, which can provide a stable artificial solid- electrolyte interphase （SEI） film on the electrode. As a result, the silicon anodes are protected well, and the cells exhibit high reversible capacity, excellent cycling stability and good rate capability. All the results demonstrate that this sandwich structure can be a promising option for high performance Si thin film lithium ion batteries.

关键词： sandwich anode LiPON coating flexible substrate silicon anode

Energy band engineering of Bi_(2)O_(2.33)–CdS direct Z-scheme heterojunction for enhanced photocatalytic reduction of CO_(2)

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Journal of Materials Science & Technology 2022年第16期111卷 17-27页

作者： Guojing Wang Zhiwei Tang Jing Wang shasha lv Yunjie Xiang Feng Li Chong Liu School of Physical Science and Technology Lanzhou UniversityLanzhou 730000China Department of Electronic Materials Science and Engineering School of Materials Science and EngineeringSouth China University of TechnologyGuangzhou 510640China Key Laboratory of Beam Technology and Material Modification Ministry of EducationCollege of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China School of Materials and Energy Southwest UniversityChongqing 404100China

In this work,a Bi_(2)O_(2.33)–CdS direct Z-scheme heterojunction was fabricated based on energy band *** Bi_(2)O_(2.33)core nanoflakes were first synthesized by electrodeposition which was followed by an annealing process to fabricate this *** the Cd S shell was deposited on Bi_(2)O_(2.33)nanoflakes utilizing the solution method,during which a suitable concentration of Cd Clsolution was used for forming a homogeneous and continuous integrated CdS shell.A space charge region and an internal electric field from CdS(+)to Bi_(2)O_(2.33)(-),which drove a direct Z-scheme charge transfer process,were formed at the *** Bi_(2)O_(2.33)–CdS exhibited excellent photocatalytic performance for CO_(2)reduction mainly attributed to the satisfactory photoinduced charge separation and transport efficiency in the direct Z-scheme *** photocatalytic CO_(2)reduction ability of Bi_(2)O_(2.33)–CdS was significantly enhanced compared with single Bi_(2)O_(2.33)or Cd S,with a CO_(2)yield rate of ca.2.9μmol/(cm^(2)h)under a 300 W Xe *** reduction of CO_(2)to CO_(2)demonstrated 94.0%selectivity.

关键词： Photocatalysis Cds Nanocomposite Vacancies Direct z-scheme heterojunction

Evolution of ion-irradiated point defect concentration by cluster dynamics simulation

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Chinese Physics B 2021年第5期30卷 69-74页

作者： Shuaishuai Feng shasha lv Liang Chen Zhengcao Li Key Laboratory of Advanced Materials(MOE) School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Key Laboratory of Beam Technology and Material Modification(MOE) College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China The Department of Engineering Physics Tsinghua UniversityBeijing 100084China

The relationship between ions irradiation and the induced microstructures(point defects,dislocations,clusters,etc.)could be better analyzed and explained by *** mean field rate theory and cluster dynamics are used to simulate the effect of implanted Fe on the point defects concentration *** is found that the depth distribution of point defect concentration is relatively gentle than that of damage calculated by SRIM ***,the damage rate and point defect concentration increase by 1.5 times and 0.6 times from depth of 120 nm to 825 nm,*** the consideration of implanted Fe ions,which effectively act as interstitial atoms at the depth of high ion implantation rate,the vacancy concentration Cv decreases significantly after reaching the peak value,while the interstitial atom concentration Ci increases significantly after decline of the previous *** the peak depth of ion implantation,Cv dropped by 86%,and Ci increased by 6.2 ***,the implanted ions should be considered into the point defects concentration under high dose of heavy ion irradiation,which may help predict the concentration distribution of defect clusters,further analyzing the evolution behavior of solute precipitation.

关键词： ion irradiation point defect concentration cluster dynamics simulation

Advancements in heterojunction,cocatalyst,defect and morphology engineering of semiconductor oxide photocatalysts

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Journal of Materiomics 2024年第2期10卷 315-338页

作者： Guojing Wang shasha lv Yuanhua Shen Wei Li Linhan Lin Zhengcao Li State Key Laboratory of New Ceramics and Fine Processing Key Laboratory of Advanced Materials(MOE)School of Materials Science and EngineeringTsinghua UniversityBeijing100084China Key Laboratory of Beam Technology and Material Modification Ministry of EducationCollege of Nuclear Science and TechnologyBeijing Normal UniversityBeijing100875China School of Physical Science and Technology Lanzhou UniversityLanzhou730000China Department of Engineering Physics Tsinghua UniversityBeijing100084China State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentTsinghua UniversityBeijing100084China

Photocatalytic technology has emerged as a crucial avenue for harnessing solar energy,presenting itself as a viable solution to address the current energy crisis and environmental *** past 50 years have witnessed significant progress and breakthroughs in scientific research on photocatalytic *** paper provides a comprehensive review of the mechanism of photocatalytic technology and methods to improve the photocatalytic efficiency of semiconductor photocatalysts,such as TiO_(2) and *** this paper,common modification methods are divided into four categories:heterojunction con-struction,cocatalysts,defects,and morphological *** origin and development of photo-catalysts in each category are briefly summarized;moreover,the latest progress in each type of modification is discussed.S-scheme heterojunctions retain the high reduction and oxidation capacity of photogenerated electrons and holes by sacrificing half of the photogenerated carriers,showing excellent performance in photocatalysis and great application *** challenges associated with current modification schemes are *** is growing interest in quantitative and atomic-level modu-lation as attractive approaches to tackling these *** the electronic spin state and internal field is important for minimizing photogenerated carrier recombination in *** review will inspire researchers and promote the application of photocatalytic technology.

关键词： Photocatalytic activity Modification Heterostructure Thermal annealing Ion irradiation

Nitrogen ion irradiation effect on enhancing photocatalytic performance of CdTe/ZnO heterostructures

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Frontiers of Materials Science 2018年第4期12卷 392-404页

作者： Yazi WANG Wei LI Yimeng FENG shasha lv Mingyang LI Zhengcao LI State Key Lab of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China Key Lab of Advanced Materials (MOE) School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Department of Engineering Physics Tsinghua UniversityBeijing 100084China

To deal with the increasingly deteriorating environment problems, more and more harsh requirements are put forward for photocatalysis application. Building semiconductor heterostructures has been proven to be an efficient way to enhance photocatalytic performance. A kind of CdTe/ZnO heterostructures were synthesized by a hydrothermal and successive ionic layer absorption and reaction (SILAR) method and achieved obviously efficient photocatalytic performance. Moreover, after the N ion irradiation treatment, the photocatalytic activity was further enhanced, which can be ascribed to the introduction of oxygen vacancy defects. The photocatalytic performance enhancement mechanism by coupling constructing heterostructures and ion irradiation are further studied to give us an overall understanding on ZnO nanowires.

关键词： N ion irradiation CdTe/ZnO heterostructures photocatalytic performance

Internal magnetic-field-enhanced photogenerated charge separation in ferromagnetic TiO_(2)surface heterojunctions

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Journal of Materials Science & Technology 2023年第29期160卷 240-247页

作者： Guojing Wang Shirong Xiong Yonghui Chen Chunchang Wang shasha lv Ke Jia Yunjie Xiang Jianbo Liu Chong Liu Zhengcao Li School of Materials and Energy Lanzhou UniversityLanzhou 730000China State Key Laboratory of New Ceramics and Fine Processing Key Laboratory of Advanced Materials(MOE)School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Laboratory of Dielectric Functional Materials School of Physics and Material ScienceAnhui UniversityHefei 230601China Key Laboratory of Beam Technology Ministry of EducationCollege of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China School of Materials and Energy Southwest UniversityChongqing 404100China

The use of the internal magnetic field of ferromagnets can effectively promote charge separation and transfer(CST)in photoelectrochemical energy ***,photoelectrochemical materials with a ferromagnetic field are scarce,and the internal magnetic field is negligible in nonferromagnetic *** address this issue,we propose a rational method for preparing ferromagnetic TiO_(2)powder using controllable oxygen vacancies in anatase TiO_(2)with co-exposed{001}and{101}***,an ex-cellent saturation magnetisation of 0.0014 emu/g in TiO_(2)is achieved owing to an asymmetric and uneven charge *** with that of nonferromagnetic TiO_(2),the efficiency of photocatalytic hydro-gen generation of ferromagnetic TiO_(2)is improved by 0.64 *** enhancement of photocatalytic hy-drogen generation is due to the different forces exerted on the electrons and holes in the magnetic field,which significantly improve the photogenerated CST efficiency of ferromagnetic TiO_(2).This result high-lights the significant role of the synergistic regulation of the crystal structure and defects in regulating the ferromagnetic characteristics of *** findings of this study provide guidance for leveraging point defects to promote CST for high-efficiency solar-energy conversion systems.

关键词： Photocatalysis TiO_(2){001}-{101}surface heterojunctions Oxygen vacancies Ferromagnetic

Progress and perspective of the cathode/electrolyte interface construction in all-solid-state lithium batteries

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Carbon Energy 2021年第6期3卷 866-894页

作者： Shiming Su Jiabin Ma Liang Zhao Kui Lin Qidong Li shasha lv Feiyu Kang Yan-Bing He Shenzhen Geim Graphene Center International Graduate School at ShenzhenTsinghua UniversityShenzhenChina Laboratory of Advanced Materials School of Materials Science and EngineeringTsinghua UniversityBeijingChina Key Laboratory of Beam Technology of Ministry of Education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijingChina

Security risks of flammability and explosion represent major problems with the use of conventional lithium rechargeable batteries using a liquid *** application of solid-state electrolytes could effectively help to avoid these safety ***,integrating the solid-state electrolytes into the all-solid-state lithium batteries is still a huge challenge mainly due to the high interfacial resistance present in the entire battery,especially at the interface between the cathode and the solid-state electrolyte pellet and the interfaces inside the ***,recent progress made from investigations of cathode/solid-state electrolyte interfacial behaviors including the contact problem,the interlayer diffusion issue,the space-charge layer effect,and electrochemical compatibility is presented according to the classification of oxide-,sulfide-,and polymer-based solid-state *** also propose strategies for the construction of ideal next-generation cathode/solid-state electrolyte interfaces with high room-temperature ionic conductivity,stable interfacial contact during long cycling,free formation of the space-charge region,and good compatibility with high-voltage cathodes.

关键词： cathode configuration design interface lithium battery solid-state electrolyte

Thermal desorption characteristic of helium ion irradiated nickel-base alloy

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Chinese Physics B 2020年第4期29卷 67-71页

作者： shasha lv Rui Zhu Yumeng Zhao Mingyang Li Guojing Wang Menglin Qiu Bin Liao Qingsong Hua Jianping Cheng Zhengcao Li Key Laboratory of Beam Technology and Material Modification Ministry of EducationCollege of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China Department of Engineering Physics Tsinghua UniversityBeijing 100084China School of Physical Science and Technology Lanzhou UniversityLanzhou 730000China Key Laboratory of Advanced Materials(MOE) School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

The nickel-base alloy is one of the leading candidate materials for generation IV nuclear reactor pressure *** evaluate its stability of helium damage and retention,helium ions with different energy of 80 keV and 180 keV were introduced by ion implantation to a certain dose(peak displacement damage 1-10 dpa).Then thermal desorption spectroscopy(TDS)of helium atoms was performed to discuss the helium desorption characteristic and trapping *** desorption peaks shift to a lower temperature with increasing dpa for both 80 keV and 180 keV irradiation,reflecting the reduced diffusion activation energy and faster diffusion within the *** main release peak temperature of 180 keV helium injection is relatively higher than that of 80 keV at the same influence,which is because the irradiation damage of 180 keV,helium formation and entrapment occur *** broadening of the spectra corresponds to different helium trapping sites(He-vacancies,grain boundary)and desorption mechanisms(different Hen Vm size).The helium retention amount of 80 keV is lower than that of 180 keV,and a saturation limit associated with the irradiation of 80 keV has been *** relatively low helium retention proves the better resistance to helium bubbles formation and helium brittleness.

关键词： nickel-base alloys helium ion irradiation thermal desorption spectroscopy

Developing cold-resistant high-adhesive electronic substrate for WIMPs detectors at CDEX

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Chinese Physics B 2020年第4期29卷 72-76页

作者： Yuanyuan Liu Jianping Cheng Pan Pang Bin Liao Bin Wu Minju Ying Fengshou Zhang Lin Chen shasha lv Yandong Liu Tianxi Sun Key Laboratory of Beam Technology of Ministry of Education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China Beijing Radiation Center Beijing 100875China

Herein we report a prototypical electronic substrate specifically designed to serve the weakly interacting massive particles(WIMPs)detectors at the China Dark Matter Experiment(CDEX).Because the bulky high-purity germanium(HPGe)detectors operate under liquid-nitrogen temperatures and ultralow radiation backgrounds,the desired electronic substrates must maintain high adhesivity across different layers in such cold environment and be free from any radioactive *** conquer these challenges,for the first time,we employed polytetrafluoroethylene((C2F4)n)foil as the base substrate,in conjunction with ion implantation and deposition techniques using an independently developed device at Beijing Normal University for surface modification prior to *** remarkable peeling strengths of 0.88±0.06 N/mm for as-prepared sample and 0.75±0.05 N/mm for that after 2.5-days of soaking inside the liquid nitrogen were observed,while the regular standards commonly require 0.4 N/mm^0.6 N/mm for electronic substrates.

关键词： WIMPs detector CDEX surface modification electronic substrate