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Electron-phonon coupling in lattice engineering of lithium niobate single crystal thin films

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arXiv

arXiv 2025年

作者： Shi, Guoqiang Chen, Kunfeng Hu, Hui Tang, Gongbin Xue, Dongfeng Multiscale Crystal Materials Research Center Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen518055 China Institute of Novel Semiconductors State Key Laboratory of Crystal Materials Shandong University Jinan250100 China School of Physics State Key Laboratory of Crystal Materials Shandong University Jinan250100 China Shenzhen Key Laboratory of New Information Display and Storage Materials College of Materials Science and Engineering Shenzhen University Shenzhen518060 China Shenzhen Institute for Advanced Study University of Electronic Science and Technology of China Shenzhen518110 China

Lithium niobate (LN) single crystal thin films are a high-performance photonic platform with applications in electro-optic modulators, nonlinear optical devices, optical frequency combs, and acousto-optic modulators. LN’s significance in photonics parallels silicon’s in electronics, addressing challenges like high power consumption and slow communication speeds, and offering potential for broad applications in optical communications, quantum computing, and artificial intelligence. Despite progress in developing LN-based photonic structures, achieving low-loss, reconfigurable, and large-scale devices requires improved processing techniques. This work introduces a quantum design methodology based on LN’s crystal structure, utilizing electron-phonon coupling through external field perturbations. Multiscale structural analysis is performed with techniques such as time-of-flight secondary ion mass spectrometry, aberration-corrected transmission electron microscopy, and X-ray absorption spectra to identify and control defect structures. Angle-resolved Raman spectroscopy, femtosecond transient absorption spectroscopy, and Density Functional Theory further reveal the mechanisms of electron-phonon coupling. These findings establish a framework for designing LN-based quantum devices with enhanced performance and diverse functionalities. Copyright © 2025, The Authors. All rights reserved.

关键词： Quantum computers

Corrosion Products Regulation of Pretreated Zero-Valent Iron by Aluminum Chloride for Enhanced Chromium (Vi) Removal and Longevity Under Aerobic Conditions

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SSRN 2024年

作者： Long, Xuejun Li, Rui Wan, Jun Zhong, Zhenxing Ye, Yuxuan Yang, Jiazhi Luo, Jun Xiao, Zhonghua Xia, Jin Liu, Yaomeng School of Environmental Engineering Wuhan Textile University Wuhan430200 China State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile University Wuhan430200 China Engineering Research Center of Ministry of Education for Clean Production of Textile Dyeing and Printing Wuhan Textile University Wuhan430200 China Jiangsu Huashui Water Engineering Co. Ltd Nanjing210009 China Hubei Industrial Construction Group Co. Ltd Wuhan430076 China

The zero-valent iron (ZVI)-based material has been applied for hexavalent chromium (Cr(VI)) decontamination in wastewater treatment and groundwater remediation, but the passivation problem limited their field application. Currently, it is still a challenge to improve ZVI’s longevity and reactivity cost-effectively. In this study, we combined dissolved oxygen and aluminum chloride to regulate the corrosion products of pretreated ZVI (pcZVI-AlCl3) for enhancing its longevity and Cr(VI) removal behavior under aerobic conditions. The optimal pre-corrosion conditions were found to be 2.5 g/L ZVI, 0.5 mM AlCl3, and a 4-hour preconditioning period. Different kinds of techniques were applied to detect the properties of pre-conditioned ZVI and corrosion products. The 57Fe Mössbauer spectra showed proportions of ZVI, Fe3O4, and FeOOH in pcZVI-AlCl3 were 49.22%, 34.03% and 16.76%, respectively. Both Al3+ and Cl− contributed to iron corrosion, and the formation of Al(OH)3 in the corrosion products remarkably improved its pHpzc (point of zero charge), favoring Cr(VI) adsorption. Continuous-flow experiments showed it maintained an effluent concentration of less than 0.1 mg/L for over 1400 BV, indicating its great potential for Cr(VI) removal in field applications. The ZVI and corrosion products showed a synergistic effect in enhancing electron transfer for Cr(VI) removal. The acidic environment was beneficial to Cr(VI) removal by pcZVI-AlCl3, and it performed effectively in a high hardness condition. The mechanisms underlying Cr(VI) removal by pcZVI-AlCl3 included adsorption, reduction and precipitation. This work provides a new strategy on ZVI pre-corrosion for improving its longevity, and insights into corrosion products regulation for enhancing Cr(VI) removal. © 2024, The Authors. All rights reserved.

关键词： Magnetite

Enhancing Electrical Conductivity and Mechanical Properties of W-Cu Composites with Additional Ag/La2O3 Hybrid

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SSRN 2024年

作者： Yang, Ming Xu, Zhengbing Yin, Cailiu Zhang, Xinjiang Zhang, Minghao Sun, Zheng State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures School of Resources Environment and Materials Guangxi University Nanning530004 China Guangxi Colleges and Universities Key Laboratory of Environmental-friendly Materials and New Technology for Carbon Neutralization Guangxi Key Laboratory of Advanced Structural Materials and Carbon Neutralization School of Materials and Environment Guangxi Minzu University Nanning530105 China

W-Cu composites with Ag/La2O3 hybrid addition were prepared through pressure-free sintering at different sintering temperatures from 900-1200 °C. Microstructure, electrical conductivity and mechanical properties of W-Cu composites with additional Ag/La2O3 hybrid were analyzed. Microstructural observation showed that Ag was partially solubilized into Cu to generate Cu-Ag solid solution during the sintering, while Ag aggregation and La2O3 dispersion were found in the Cu matrix. The higher sintering temperature reduced the porosity of the sintered bulk composites. W-Cu composites with Ag/La2O3 hybrid addition possessed the higher values of electrical conductivity, hardness and strength at each sintering temperature, and the optimum sintering temperature was 1100 °C. At 1100 °C sintering, the highest electrical conductivity of the Ag/La2O3 hybrid added composites reached to 51.8 ± 0.85 %IACS, and the hardness, compressive and tensile strengths respectively achieved 68.4 %, 44.1 %, and 67.3 % enhancement comparing with W-Cu composites. © 2024, The Authors. All rights reserved.

关键词： Sintering

Improved Ion Transport Capacity in Ceramic Linbo3 by Doping with W to Increase the Li Vacancies

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SSRN 2023年

作者： Xian, Lei Peng, Jun Kong, Ling-Bin State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of Technology Lanzhou730050 China School of Materials Science and Engineering Lanzhou University of Technology Lanzhou730050 China

LiNbO3 is a commonly used cathode coating material in Li-ion batteries (LIBs). However, LiNbO3 has a poor ion transport capacity owing to the strong binding ability of the lattice structure to Li. In this study, a series of Li(1–x)Nb(1–x)WxO3 (x = 0–0.5) samples were synthesized by dissolving WO3 in LiNbO3, and the effects on structural changes and the ion transport capacity were studied. When x = 0.2, the activation energy was 0.5151 eV, and the ionic conductivity reached a maximum of 1.75×10-6 S cm-1 at 90 °C, which was 104-fold improvement compared with the ionic conductivity of LiNbO3 owing to the increased vacancy. When the amount of W was higher than the maximum solution amount, the LiNbWO6 cubic phase appeared. This study provides a new method to improve the migration ability of Li ions in LiNbO3 and an experimental basis for subsequent studies on LiNbO3 with WO3 added as a coating material for LIBs cathodes. © 2023, The Authors. All rights reserved.

关键词： Ionic conductivity

Research prospects of graphene-based catalyst for seawater electrolysis

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materials Futures 2023年第4期2卷 80-97页

作者： Xinyu Li Yingjie Liu Yanhui Feng Yunwei Tong Zhenbo Qin Zhong Wu Yida Deng Wenbin Hu Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education Tianjin University Tianjin 300072People’s Republic of China Key Laboratory of Composite and Functional Materials School of Material Science and Engineering Tianjin UniversityTianjin 300072People’s Republic of China State Key Laboratory of Marine Resource Utilization in South China Sea School of Materials Science and EngineeringHainan UniversityHaikou 570228People’s Republic of China Joint School of National University of Singapore and Tianjin University International Campus of Tianjin University Binhai New CityFuzhou 350207People’s Republic of China

Seawater has obvious resource reserve advantages compared to fresh water,and so the huge potential advantages for large-scale electrolysis of hydrogen production has been paid more attention to;but at the same time,electrolysis of seawater requires more stable and active catalysts to deal with seawater corrosion ***-based materials are very suitable as composite supports for catalysts due to their high electrical conductivity,specific surface area,and ***,the review introduces the problems faced by seawater electrolysis for hydrogen production and the various catalysts *** them,the advantages of catalysis of graphene-based catalysts and the methods of enhancement the catalytic performance of graphene are ***,the development direction of composite catalysts is prospected,hoping to provide guidance for the preparation of more efficient electrocatalysts for seawater electrolysis.

关键词： graphene seawater electrolysis catalyst

Flexible polytriphenylamine-based cathodes with reinforced energystorage capacity for high-performance sodium-ion batteries

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Science China materials 2022年第1期65卷 32-42页

作者： Lulu Mo Gangyong Zhou Peng Ge Yue-E Miao 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 UniversityShanghai 201620China Key Laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringJiangnan UniversityWuxi 214122China School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China

Owing to the excellent redox reversibility and structural diversity,polytriphenylamine(PTPAn)has been regarded as one of the promising cathode candidates for sodium-ion ***,it still suffers from the bulk aggregation and low operating capacity in practical *** by the in-situ polymerization,leaf-like PTPAn nanosheets are uniformly introduced on the surface of carbon nanofibers(CNFs)to form the free-standing CNF@PTPAn composite ***,the formation mechanism of the leaf-on-branch structure of CNF@PTPAn composites is systematically explored,confirming that the controlling of oxidation rate and growth degree plays crucial roles in tuning the morphology and active material content of the composite *** by the capacity-cutting analysis,the effective coupling between the active PTPAn and conductive CNFs can provide fast electron/ion-shuttling channels and deepen the electrochemical reaction *** 50mAg^(-1),the capacity of the optimized CNF@PTPAn composite can reach 105mAh g^(-1),with a stable rate capability of 78mAh g^(-1)even at 400mAg^(-1)after 500 cycles in a half *** detailed kinetic analysis confirms that the ion-storage behaviors in the lowvoltage region can be tailored for the improved capacitive contribution and diffusion ***,the flexible CNF-based full cell with CNF@PTPAn as the cathode and CNFs as the anode exhibits a high energy density of 60Wh kg^(-1)at 938Wkg^(-1).Based on this,the rational design is expected to provide more possibilities to obtain advanced freestanding electrode systems.

关键词： polytriphenylamine carbon nanofibers electrospinning organic cathode flexible sodium-ion batteries

CdS nanosheets decorated with Ni@graphene core-shell cocatalyst for superior photocatalytic H_(2) production

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Journal of materials Science & technology 2020年第21期56卷 170-178页

作者： Tingmin Di Liuyang Zhang Bei Cheng Jiaguo Yu Jiajie Fan School of Materials Science and Engineering Wuhan Institute of TechnologyWuhan 430205China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450002China

A novel cocatalyst,*** nickel nanoparticles encapsulated in few-layer graphene(Ni@C),is obtained by carbonization of metal–organic frameworks(MOF)and leaching treatment of hydrochloric *** is selected as the cocatalyst for CdS nanosheets,forming CdS-Ni@C *** remarkably improves the photocatalytic activities of CdS nanosheets due to the synergistic effect of Ni nanoparticles and graphene *** addition,the Ni nanoparticles encapsulated by graphene layers effectively isolate Ni from the ambient,which avoids contamination and curbs *** larger work function of Ni@C and outstanding conductivity of graphene promote the electron transfer from CdS to Ni@C,suppressing the recombination of photogenerated carriers and facilitating the separation of photogenerated electronhole *** strategy by adopting this novel cocatalyst provides a new solution to the improvement of the photocatalytic hydrogen production.

关键词： CdS nanosheets Photocatalytic hydrogen production Nickel Graphene Core-shell cocatalyst Metal-organic frameworks(MOF)

Electrolyte Effect on the Electrochemical Behaviors of Manganese Fluoride Material for Aqueous Asymmetric and Symmetric Supercapacitors

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SSRN 2023年

作者： He, Zheng-Hua Gao, Jian-Fei Kong, Ling-Bin State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of Technology Lanzhou730050 China School of Materials Science and Engineering Lanzhou University of Technology Lanzhou730050 China

Exploring wide voltage window materials is not only an available measure to enhance the energy density of hybrid supercapacitor (HSCs), but also avoids the dynamic mismatch caused by different energy storage mechanisms of two electrodes in assembled symmetrical HSC. However, there are few reports about the wide potential window materials except Bi2O3 and VO2. Therefore, the MnF2 synthesized by solvothermal reaction was served as the electrode for HSC. The MnF2 exhibits electrochemical activity in alkaline solution in three-electrode system, especially with a wide potential window of -0.8~+0.5 V in 2 M NaOH. Furthermore, the assembled MnF2//MnF2 symmetrical HSC has a potential window of 1.5 V, and it exhibited outstanding long-cycle capability. Meanwhile, when MnF2 was taken as the negative and positive respectively, the potential windows of asymmetric devices CoMoO4//MnF2 and MnF2//AC can reach 1.3 and 1.45 V, respectively, showing excellent cycle stability. This work shows that MnF2 material has great research value in HSC, and provides a new research direction for developing high-performance devices. © 2023, The Authors. All rights reserved.

关键词： Fluorine compounds

Long lifespan Li-Se battery: Advances, challenges and prospects

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Journal of Energy Chemistry 2025年 102卷 712-733页

作者： Hongyan Li Thomas L. Madanu Tarek Barakat Wen-Da Dong Alexandru Vlad Xikun Zhang Cheng-Bin Jin Yu Li Bao-Lian Su College of Materials and Chemistry China Jiliang University Hangzhou 310018 Zhejiang China Laboratory of Inorganic Materials Chemistry (CMI) Namur Institute of Structured Matter (NISM) University of Namur 61 rue de Bruxelles B-5000 Namur Belgium State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430074 Hubei China Institute of Condensed Matter and Nanosciences Molecular Chemistry Materials and Catalysis Université catholique de Louvain Louvain-la-Neuve Belgium

Lithium-selenium (Li-Se) batteries have attracted increasing attention as one of the next-generation battery systems due to much higher electronic conductivity and comparable volumetric capacity of Se compared to the popular sulfur cathode. However, its practical application still faces great challenges, especially the rapid capacity decay triggered by the loss of active Se species. A comprehensive review to uncover the in-depth failure mechanism and provide targeted solutions to promote the stable operation of Li-Se batteries is urgently needed. This review systematically summarizes the strategies in the new perspective, focusing on the optimization of Se utilization in Li-Se batteries by keeping a high Se maintenance in the cathode and accelerating the electrochemical kinetics of lithium polyselenides (LiPSe) conversion. On the basis of structural design and Li 2 Se active material introduction to accommodate volume expansion, blocking shuttle transport of LiPSe by physical/chemical adsorption, bonding Se with polymers or cathode electrolyte interphase (CEI) construction, and catalytic design to accelerate the conversion of LiPSe, different strategies for improving the utilization of Se have been evaluated and discussed. To address the inevitable loss of Se, prospects on inactive Se reactivation and Li protection are detailedly proposed and analyzed referring to the chemistry and corrosion science. Additionally, the perspectives on the future design and comprehensive parameter evaluations for the optimization of Li-Se batteries are recommended. This review comprehensively explains the causes and solutions of capacity fading and provides potential efforts for lifespan expansion of batteries, shedding light on the future development of Li-Se batteries.

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