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SSRN 2024年

作者： Liu, Bin Wang, Chaoli Ren, Jing Javed, Muhammad Sufyan Han, Weihua National & Local Joint Engineering Laboratory Light Convers Materials & Ministry of Education Lanzhou University Lanzhou730000 China School of Physical Science and Technology Lanzhou University Lanzhou730000 China Lanzhou University China

Photocatalysts based on zinc oxide (ZnO) are promising for environmental applications, but their weak photoresponse and low photocarrier separation efficiency limit their practical use. To tackle this issue, we constructed Z-scheme composite photocatalysts of ZnO to boost its photocatalytic performance. We achieved the Z-scheme architecture by hydrothermally decorating SnS2 nanoparticles onto ZnO microspheres. Its photocatalytic performance was evaluated through the degradation of Rhodamine B (RhB) under visible light with the assistance of magnetic stirring. The composite photocatalyst exhibited superior performance compared to individual ZnO and SnS2, achieving an optimal degradation rate of 0.0706 min-1. This rate was 15.08 times higher than that of individual ZnO and 10.51 times higher than individual SnS2. Free radical trapping experiments showed that ·O2- and ·OH radicals played a key role in RhB degradation. The Z-scheme composite structure established novel charge transport pathways, guided the migration of photogenerated carriers, and improved spatial separation, thereby enhancing photocatalytic performance. © 2024, The Authors. All rights reserved.

关键词： Degradation

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Self-luminescence and color-tunable emission in KYb_3F_(10) matrix under different excited sources

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Journal of Rare Earths 2020年第7期38卷 689-696,I0001页

作者： Lili Han Zhijing Zhang Jiang Chen Yirun Zhu Dongcheng Zhu Juan Zhao Wei Shen Zhipeng Ci Key Laboratory of Atomic and Molecular Physics&Functional Materials of Gansu Province College of Physics and Electronic EngineeringNorthwest Normal UniversityLanzhou 730070China Key Laboratory of Special Function Materials and Structure Design Ministry of EducationLanzhou UniversityLanzhou 730000China National&Local Joint Engineering Laboratory for Optical Conversion Materials and Technology Lanzhou UniversityLanzhou 730000China

A self-luminescence KYb3 F10 material was obtained via a mild hydrothermal *** structure,morphology and the corresponding luminescence properties were *** is a self-luminesce nce based on the effective recombination of electron and hole on surface defects or electronic centers in KYb3 *** pH values have significant impact on crystallinity and self-luminescent intensity of target *** the introduction of Tb3+and Eu3+into KYb3 F10 matrix,a series of color-tunable emission can be ***,Tb3+and Eu3+can also affect the self-luminescent intensity of host *** there is no obvious energy transfer between host and activators,Tb3+has a distinct sensitive effect on Eu3+ascribed to the energy transfer between Tb3+and Eu3+.In addition,the thermal stability was carefully investigated,which demonstrate the materials can be as a candidate in fluorescent lamps and displays.

关键词： KYb3F10 Self-luminescence Color-tunable emission Rare earths

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Synergistic Catalytic Effect of Multiple Active Sites in High-Entropy MAX materials for Lithium Polysulfide Enables High-Performance Lithium–Sulfur Batteries

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ACS Applied Energy materials 2025年第11期8卷 7538-7550页

作者： Yongjie Ye Sisi Liu Yixin Luo Yongqian He Wanqi Zhang Mengqing Wang Ying Chen Xuewen Peng Caixiang Wang Qin Tang Yan Luo Bing Wu Hongbo Shu Ruizhi Yu Manfang Chen National Base for International Science & Technology Cooperation National Local Joint Engineering Laboratory for Key Materials of New Energy Storage Battery Hunan Province Key Laboratory of Electrochemical Energy Storage & Conversion School of Chemistry Xiangtan University Xiangtan 411105 China Department of Inorganic Chemistry University of Chemistry and Technology Prague Technická 5 Prague 6 166 28 Czech Republic Institute of Micro/Nano Materials and Devices Ningbo University of Technology Ningbo Zhejiang 315211 China

The commercialization of lithium–sulfur batteries (LSBs) is limited by slow kinetics and the detrimental shuttle effect of lithium polysulfides (LiPSs), which impede their practical application. This study addresses these issues by exploring the use of high-entropy MAX phases (NbVMoTiAlC3and CrVMoTiAlC3) as cathode additives. Through high-temperature ball milling, two types of MAX phases are synthesized, and their roles in enhancing the electrochemical performance of LSBs are systematically evaluated. The study finds that Nb-based MAX phases exhibit stronger interactions between transition metals, which significantly improve the electrical conductivity and chemical stability compared to Cr-based MAX phases. These unique properties enable NbVMoTiAlC3to enhance Li+migration kinetics and improve sulfur species utilization efficiency. In situ ultraviolet–visible spectroscopy further shows that NbVMoTiAlC3promotes the catalytic conversion of LiPSs, increasing the number of S3•–radicals. As a result, the cell with NbVMoTiAlC3@CNT/S exhibits a high capacity retention of 85.29% after 100 cycles under a sulfur loading of 3.85 mg cm–2and a low capacity decay rate of 0.088% after 500 cycles at 3 C. This work demonstrates the potential of MAX-phase materials to overcome key challenges in LSBs, offering insights for the development of high-performance energy storage systems.

关键词： lithium-sulfur battery shuttle effect high entropy MAX phase synergistic effect

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Free-standing flexible graphene-based aerogel film with high energy density as an electrode for supercapacitors

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Nano materials Science 2021年第1期3卷 68-74页

作者： Shijia Yuan Wei Fan Yanan Jin Dong Wang Tianxi Liu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringInnovation Center for Textile Science and TechnologyDonghua University2999 North Renmin RoadShanghai201620PR China Key Laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringJiangnan UniversityWuxi214122PR China Key Laboratory for Special Functional Materials of Ministry of Education National&Local Joint Engineering Research Centre for High-efficiency Display and Lighting TechnologySchool of Materials and EngineeringCollaborative Innovation Centre of Nano Functional Materials and ApplicationsHenan UniversityKaifeng475004PR China

Two-dimensional graphene film exhibits sluggish ion diffusivity while three-dimensional(3D)graphene aerogel has low packing density and poor mechanical ***,there is an urgent need for graphenebased film with both mechanical robustness and high specific ***,we present an easy and scalable strategy for fabricating a free-standing flexible graphene-based aerogel film electrode with a two-layered structure,in which the top layer is an interconnected macroporous reduced graphene oxide/carbon nanotube(RGO/CNT)aerogel,and the bottom layer is a flexible electrospun polyacrylonitrile(PAN)nanofiber *** porous 3D structure of the aerogel provides fast transport of electrolyte ions and electrons,while the nanofiber membrane provides both strong support for the aerogel and mechanical ***(PPy)can be uniformly loaded on RGO/CNT/PAN(RCP)composite aerogel film to provide pseudocapacitance,and nitrogen-doped RGO/CNT/carbon nanofiber(NRCC)aerogel film can be obtained by further *** resultant RCP@PPy-0.05//NRCC based asymmetric supercapacitor can have a maximum voltage of 1.7 V and a maximum energy density of 60.6 W h kg^(-1)at 850.2 W kg^(-1).This indicates that free-standing graphene-based aerogel film can be used in flexible supercapacitors.

关键词： Graphene Aerogel film Polypyrrole N-doping Supercapacitor

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A Longitudinal Gradient Architecture Achieves the Better Tensile Properties in Ti6242 Alloy

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SSRN 2023年

作者： Guo, Yang Xu, Pingwei Liang, Yu College of Materials and Metallurgy Guizhou University Guiyang China Guizhou Key Laboratory for Mechanical Behavior and Microstructure of Materials Guizhou University Guiyang China National＆Local Joint Engineering Laboratory for High-performance Metal Structure Material and Advanced Manufacturing Technology Guiyang China

Simultaneous increase in strength and uniform ductility is obtained in Ti6242 joints using a longitudinal gradient structure. Such architecture also displays the strain hardening dependent on the volume fraction (Vf) of the gradient layer, and the maximum strain hardening is achieved in the freestanding gradient layer (Vf=100%). An extra strain hardening evidenced by the increased back stress occurs in gradient samples, which partly accounts for the concurrently improved properties. Also, more boundaries of α/β plates in lamellar structure and increased dislocations in primary α phase (αp) are responsible for the enhanced strength. Such microstructural characteristics in the gradient layer, including significant thinning of β plates, the locally disappeared boundaries of αp and transformed β structure (βt) and the reduced property difference between deformed αp and βt, contribute as well on the ductility improvement. This work provides a guideline for manufacturing high-performance Ti alloys via microstructural regulation or gradient architecture. © 2023, The Authors. All rights reserved.

关键词： Strain hardening

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A New Strategy to Improve the Thermal Stability of (Sr, Ba)2sio4: Eu2+ Phosphors by Ion Substitution engineering

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SSRN 2022年

作者： Liu, Zhengqiang Seto, Takatoshi Tian, Houdao Wang, Yuhua National and Local Joint Engineering Laboratory for Optical Conversion Materials and Technology of National Development and Reform Commission School of Materials and Energy Lanzhou University Lanzhou730000 China

With high quantum efficiency and appropriate excitation & emission wavelength, (Sr, Ba)2SiO4: Eu2+ phosphors exhibit perfect photoluminescence properties in the room temperature. However, limited by its poor thermal stability, they are difficult to be applicated in the high-performance lighting and display fields. In this work, we propose a new strategy of ion substitution engineering to greatly improve the thermal stability of (Sr, Ba)2SiO4: Eu2+ phosphors. Through the conventional high-temperature solid-state reaction, we successfully introduced alkali metal ions K+/Na+ into the SrBaSiO4 host lattice, thereby strengthening its structural rigidity, and improving the luminous intensity and narrowing the Full-Width Half-Maximum (FWHM) of the phosphors. The substitution of K+/Na+ ions can also deepen the traps in the phosphor, which proved by the thermoluminescence (TL) measurement. joint effect of the stronger crystal rigidity and deeper traps leads to a higher thermal stability, and the emission intensity at 150 °C can reach to 81.5% of the room temperature with Na+ substitution, which is significantly better than the commercial SrBaSiO4: Eu2+ phosphor. The mechanism of alkali metal ions improving thermal stability is explained reasonably through the photoionization and trap compensation. This new strategy makes it possible for (Sr, Ba)2SiO4: Eu2+ phosphors to be wider applicated in the high-performance WLED devices. © 2022, The Authors. All rights reserved.

关键词： Phosphors

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Corrigendum to“Anthraquinone derivatives supported by Ti_(3)C_(2)(MXene)as cathode materials for aluminum-organic batteries”[*** Chem.74(2022)174–183]

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Journal of Energy Chemistry 2024年第4期91卷 685-685页

作者： Gaohong Wu Cuncai Lv Wenrong Lv Xiaoxiao Li Wenming Zhang Zhanyu Li Hebei Key Laboratory of Optic-Electronic Information and Materials National&Local Joint Engineering Laboratory of New Energy Photoelectric DevicesCollege of Physics Science and TechnologyHebei UniversityBaoding 071002HebeiChina

The authors regret that the printed version of the above article contained an error *** hope to correct it here.[14]*** Legein,Franck Fayon,***.,132(2020)19409–19415.

关键词： MXene cathode error

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Feasible engineering of cathode electrolyte interphase enables the profoundly improved electrochemical properties in dual-ion battery

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Journal of Energy Chemistry 2020年第11期29卷 416-423页

作者： Wen-Hao Li Hao-Jie Liang Xian-Kun Hou Zhen-Yi Gu Xin-Xin Zhao Jin-Zhi Guo Xu Yang Xing-Long Wu Key Laboratory for UV Light-Emitting Materials and Technology Northeast Normal UniversityMinistry of EducationChangchun 130024JilinChina National&Local United Engineering Laboratory for Power Batteries Faculty of ChemistryNortheast Normal UniversityChangchun 130024JilinChina

Dual-ion battery(DIB) composed of graphite cathode and lithium anode is regarded as an advanced secondary battery because of the low cost, high working voltage and environmental friendliness. However,DIB operated at high potential(usually ≥ 4.5 V versus Li+/Li) is confronted with severe challenges including electrolyte decomposition on cathode interface, and structural deterioration of graphite accompanying with anions de-/intercalation, hinder its cyclic life. To address those drawbacks and preserve the DIB virtues, a feasible and scalable surface modification is achieved for the commercial graphite cathode of mesocarbon microbead. In/ex-situ studies reveal that, such an interfacial engineering facilitates and reconstructs the formation of chemically stable cathode electrolyte interphase with better flexibility alleviating the decomposition of electrolyte, regulating the anions de-/intercalation behavior in graphite with the retainment of structural integrity and without exerting considerable influence on kinetics of anions diffusion. As a result, the modified mesocarbon microbead exhibits a much-extended cycle life with high capacity retention of 82.3% even after 1000 cycles. This study demonstrates that the interface modification of electrode and coating skeleton play important roles on DIB performance improvement, providing the feasible basis for practical application of DIB owing to the green and scalable coating procedures.

关键词： Dual-ion battery Cathode electrolyte interphase Graphite Cathode

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Wire-in-Wire TiO_(2)/C Nanofibers Free-Standing Anodes for Li-Ion and K-Ion Batteries with Long Cycling Stability and High Capacity

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Nano-Micro Letters 2021年第7期13卷 91-104页

作者： Die Su Yi Pei Li Liu Zhixiao Liu Junfang Liu Min Yang Jiaxing Wen Jing Dai Huiqiu Deng Guozhong Cao National Base for International Science and Technology Cooperation National Local Joint Engineering Laboratory for Key Materials of New Energy Storage BatteryHunan Province Key Laboratory of Electrochemical Energy Storage and ConversionSchool of ChemistryXiangtan UniversityXiangtan 411105People’s Republic of China Department of Materials Science and Engineering University of WashingtonSeattleWA 98195-2120USA College of Materials Science and Engineering Hunan UniversityChangsha 410082People’s Republic of China School of Physics and Electronics Hunan UniversityChangsha 410082People’s Republic of China

Wearable and portable mobile phones play a critical role in the market, and one of the key technologies is the flexible electrode with high specific capacity and excellent mechanical flexibility. Herein, a wire-in-wire TiO_(2)/C nanofibers (TiO_(2) ww/CN) film is synthesized via electrospinning with selenium as a structural inducer. The interconnected carbon network and unique wire- in-wire nanostructure cannot only improve electronic conductivity and induce effective charge transports, but also bring a superior mechanic flexibility. Ulti-mately, TiO_(2) ww/CN film shows outstanding electrochemical performance as free-standing electrodes in Li/K ion batteries. It shows a discharge capacity as high as 303 mAh g^(−1) at 5 A g^(−1) after 6000 cycles in Li half-cells, and the unique structure is well-reserved after long-term cycling. Moreover, even TiO_(2) has a large diffusion barrier of K^(+), TiO_(2) ww/CN film demonstrates excellent perfor-mance (259 mAh g^(−1) at 0.05 A g^(−1) after 1000 cycles) in K half-cells owing to extraordinary pseudocapacitive contribution. The Li/K full cells consisted of TiO_(2) ww/CN film anode and LiFePO_(4)/Perylene-3,4,9,10-tetracarboxylic dianhydride cathode possess outstanding cycling stability and demonstrate practical application from lighting at least 19 LEDs. It is, therefore, expected that this material will find broad applications in portable and wearable Li/K-ion batteries.

关键词： Free-standing TiO_(2)/C nanofiber Li-ion battery K-ion battery First-principles calculation Full cells

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Adjusting the SnZn defects in Cu_(2)ZnSn(S,Se)_(4) absorber layer via Ge^(4+) implanting for efficient kesterite solar cells

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Journal of Energy Chemistry 2021年第10期30卷 1-7,I0001页

作者： Yueqing Deng Zhengji Zhou Xin Zhang Lei Cao Wenhui Zhou Dongxing Kou Yafang Qi Shengjie Yuan Zhi Zheng Sixin Wu Key Lab for Special Functional Materials Ministry of EducationNational and Local Joint Engineering Research Center for High-Efficiency Display and Lighting TechnologyAnd School of MaterialsHenan UniversityKaifeng 475004HenanChina Collaborative Innovation Centre of Nano Functional Materials and Applications HenanChina Key Laboratory for Micro-Nano Energy Storage and Conversion Materials of Henan Province College of Advanced Materials and EnergyInstitute of Surface Micro and Nano MaterialsXuchang UniversityXuchang 461000HenanChina

The development of kesterite photovoltaic solar cells has been hindered by large open-circuit voltage(V_(oc))***,Snzn deep point defect and associative defect cluster have been recognized as the main culprit for the Voc ***,manipulating the deep-level donor of Snzn antisite defects is crucial for breaking through the bottleneck of present Cu_(2) ZnSn(S,Se)_(4)(CZTSSe)photovoltaic *** this study,the Snzn deep traps in CZTSSe absorber layer are suppressed by incorporation of *** energy levels and concentration of Snzn defects measured by deep-level transient spectroscopy(DLTS)decrease *** addition,the grain growth of CZTSSe films is also promoted due to Ge implantation,yielding the high quality absorber ***,the efficiency of CZTSSe solar cells increases from 9.15%to 11.48%,largely attributed to the 41 mV Voc increment.

关键词： CZTSSe Defect Absorber layer Solar cells V_(oc)

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